ELEreTRONI - americanradiohistory.com · kori2 output 0r7 500k v lin. v to b3500oost r4097k 750 9...
62
JUNE 1972 A HARCOURT BRACE JOVANOVICH PUBLICATION ELEreTRONI TECHNICIAN/DEALER WORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCULATION
Transcript of ELEreTRONI - americanradiohistory.com · kori2 output 0r7 500k v lin. v to b3500oost r4097k 750 9...
JUN
E 1972
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Which T
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Service C
ontracts are Big B
usiness
JERROLD,
BRIGHTEN
YOUR
PROFIT
PICTURE!
NATIONWIDE NETWORK OFRECEPTION SPECIALISTS
POWERMATE PREAMPS
COLORAXIAL CABLE -
PRODUCTS AND KNOW-HOW TOSOLVE ANY RECEPTION PROBLEM
1-17,-15!-tizscTi
MOUNTINGHARDWARE
SPLITTERS
THE INDUSTRY'S NO. 1 MATV LINE
CALL OR WRITE:JERROLD ELECTRONICS CORP., P.O. BOX A, 401 WALNUT STREET, PHILADELPHIA, PA.(215) WA 5-9870, EXT. 261
. . for more details circle 116 on Reader Service Card
a GENERAL INSTRUMENT company
0011116111mm useminklimms
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ELECTRONICTECHNICIAN/DEALER
2_/-1 aria=EFCOMPLETE MANUFACTURER S' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
SCHEMATIC NO. SCHEMATIC NO.
EMERSON 1421 PHI LCO-FORD 1422Color.TVChassis 32K167332,16864,1687.2 Color TV Chassis 20ST30AV
MAGNAVOX 1420 SYLVANIA 1423TV Chassis T959 Color -TV Chassis D18-1, -2, 3
MOTOROLA 1424TV -Chassis TS -467
UNLESS OTHERWISE SPECIFIED,ALL VOLTAGE MEASUREMENTS MADE WITH VTVM.
NO SIGNAL APPLIED, CONTRAST AT MAXIMUICANDALL OTHER CONTROLS SET FOR NORMALOPERATION
2 CAPACITANCE VALUES GREATER THAN I ARE IN11C0FARADS, LEEK THAN I IN MICOFARADS
3 ALE RESISTORS ARE 1/2 W, 10%4 ALL CAPACITORS ARE 5000,10%5115EARLY PRODUCTION6 TEST POINT7 VOLTAGE SOURCE
III COMPONENT LOCATED OFF BOARD9 A COMPONENT LOCATED ON UNDERSIDE OF
BOARD (COPPER SIDE I10,14 AND J5 MAT BE LABELLED J8 AND J7
RESPECTIVELY.ON COMPONENT SIDE OF BOARD
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1420MAGNAVOXTV Chassis T959
SYMBOL DESCRIPTION
JUNE 1972
MAGNAVOX PART NO.
T204 -sound take -off xformer & 4 5MHz trap 36A040-26T301 -sound IF xformer 36A040-27T302 -Quad coil 36A023.8T303 -audio output xformer 32A021-7T401 -vent output xformer 32A022-1T501-horiz output xformer 32A021-13
deflection yoke 36A040-22VRI 500K, volume on/oft 22A012-10VR2-100K, bright '2'2A012-9VR3-500n, contrast 22A012.3VR4-1M, vert hold 22A012.1VR5-100K, ho.12 range 22A012.5VR6-1M, vert height 22A012-5VR7-500K, vent II? 22A012.5VR9-2M, CRT bias 22A012.6Fl -fuse 2a, 125v 18A008.1F2 -fuse, 0 35a 250v 18A019-12K401 -Vert retrace pac 25A0191
UHF tuner 34A008-4VHF tuner 34A008.3
V713171011
AUDIO OUTPUT
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN'DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
1421EMERSONColor -TV Chassis
32K1673-32, 1686-4,1687-2
womm 2y1/ 4M;GgAixJUNE 1972COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
SYMBOL DESCRIPTION EMERSON PART NO.
R258 -1M, volume control 971571R301 -10K, adj, rej, control 75/1101.8R315-7500. sound rej. control 75A101-3R321 -8.2K, 3w 970432R401 60K, AGC control 754101-9R468 -300K, vert lin control 970435R474 -120n. thermistor 644501
R709-2500, contrast control In 25-1n. picture tube sets 754134-4
RR77°910:325°.4M0,,mcnterrasb,t cighonttrcoolni,70211-in.
picture tube sets 970447970449
R475 67ma. 20v. VDR
R724-VDR 6144613
R504 -1M. color killer control
970452rerltorhocoldntcroonitrol in 25 -in. picture tube sets754134-6
7 56 9A1 7/ 1104459136.-31
R725 -2.8M. high voltage adj.RRR77700°331---5110001KKn,: vert hold control in 21 -in. picture tube sets754127-9R704 -3.4M. vert size control 75496.20 8728-100 vert center control
77554A641081-271707-1.1K, tint control 75A149-4R13773932:v15DMR 61446-2,
focus controlR708 -250K. bright control in 25 -in. picture tube sets 754104-5
R145-3.8.. thermistor1/,7011_.750K, hrigkr oontrol M.25-1,6 0.'402 tLihre re,' 7.1;1:.,l,V, 61427.1
PWS 300
1301IStII
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RUN CHANGES°Start of production./7,\Component part numbers HVhousing ossombl,l.Wlercept17041chonotO to &moot! possibifiljeol
15KHz buzz.See -up switch S701not m Wer sets. CNN
P301If
INPUT
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T.05141114
COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802
C705A-200pf. 350v, multiple electC7058-120 of 350v, multiple electC705C-80 uf. 350v. multiple electC706A-10pf, 3500, multiple electC70613-200, 200v, multiple electC706C-20uf, 200v, multiple electC7060-50 of, 50v, multiple elect1401 -sound takeoff coil1402 -quadrature coil
PWS 500 -
juIP110
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24020502
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OMNI =011,
1501131
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
1422PHI LCO-FORDColor -TV Chassis20ST30AV
JUNE 1972
ELECTRONIC 2J-TW=Egia jitrCOMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
7ALTERNATE
R10
15KTUNER r 1
2g 1 1.iv
TO +1450
T1242 'UHFI
142471IJUNER
r- -TT 1"---1250
I a+ .3-12L°11614231-1 wiF
JUNEL1
E.1112211
76.14124-3
J T
EIK1+
(In)
MR/11110
SW I TON
LOCATED - ...... .. (:).....(} ..ON BACK,r' WA
R1700
WA
1
1 IV
OF VHF
TUNER 11)113
-1L103 I
R34A
3305%
1
.001TMO4 * 1
3'To(i,i'doPraia
104 4
+ RFC
VHF ICI /84
fiCiicP2
F I.E.LIM)
NOTES-I .All VOLTAGES TAAEN UNDER NO
SIGNAL CONDITIONS, ANTENNA
REM:11E0,410 TUNER OFF DOME
VOLTAGES N PARENTHESIS ARE
WITH A MODERATELY STRONG
510111 DEVELOPING 16V 0.1AGC AT 124
2 ROITAGES MEASURED WITH 8111
115 VT V.N FROM POINT
INDICATED TO CHASSIS GROUND
3 8ALLOONSOTETC. SHOWN
ON SCHEMATIC INDICATE
WAVEFORM TEST POINTS
4. CONTROLS SET FOR NOM1AlOPERATION.
5 ipCRITICAL SAFETY /47
LACE WITH EXACT
SPECIFIED PART AS INDICATEDIN PARTS LIST
9 5V
R33A820 VR2
21
^6/TUNERDELAY
TV44RF ACC
dir 60(8 90)
IKR 7
0 0STRAP
TO +20V
120
R17A
TRANSISTOR RISINGS - BOTTOM VIEWf 1 C
(D1,06,OPTI 102,03,09,OPT.)
((I
06(01,02,03, 04,05,0108,09,OPT
SYMBOL DESCRIPTION PART NO.
C101-240/240/5/1600, @200v, & video output G2 30.2601-33L2 -ratio det coil ...............................324906-1L3 -sound takeoff & 4.5MHz trip coil 32-4955-2L13-horiz stabilizer 32-4754-3N 1 -CRT network 30-6058-2R93-varistor, 560v 0 10ma, vert bias 33.13735R103-3 n. fusistor 33.1381.5AOT-audio output xformer 32.10161-2
AUDIO
HOT-horiz output xformer 32-10152.1VOT-vert output xformer 32.10160-3VR2-2K, tuner delay 33.5628-13VR3A-8-60K, horiz hold aux 25K contrast 33.5637-4VR4A-B-C-150K, vert hold, 2.5M, vert lin, 500K, vert size 33-5645.1VR101-25K, on/off volume, sw 33-5646.8VR102-250K, bright 33-5445-1
tuner. VHF, TT211 76-14124.2yoke assembly 76.14309-1
T P......, ....................... ................................... .... ir ;rowM37R16 TV12
R18 R20INCI60203RD. SIF 470 ri L2 a380
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1N6OD
R4s5.6K
R2 - -x 'I460
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5.6K
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4.74.005
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127K'
27K
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660
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AUDIO
DRIVER
RN
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25V 1(yr,C8-.01 ov
VI°PI 6A05A
A UD OUT
R8 s R9 3
10012.7K
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1345100
M14
2015%
2 2.2K
82001400
R25
I(
RI4150
+120
TO M5TA
TO M32* THE FILAMENT VOLTAGE IS HALF -WAVE RECTIFICATION OF 60HI. SITHIS IS NOT A PURE D.C. VOLTAGEOR AN RMS SINE WAVE, NEITHERA D.C. METER NM AN A.C. METERWILL INDICATE TRUE VOLTAGE.VOLTAGE READINGS ARE
NOR OSC.GIVEN FOR THE PURPOSE
P 111
R36 R24
I.81 151(5%)5% I
C37
.005.
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13.71170C21 R3510 DO5%
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141.25,
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C22
18K
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12
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260k
P53680
R522705%
LIT C6347
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1 T. VIE 260, s
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OF DETERMININGiP
CONTINUITY
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11 I LII
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(280)1
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5%
R50 C36 C34 C31 R30
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R47
3.3K
8.22
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625K
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is% a 5%
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DI
A.O.T.E1
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30
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,TO +145011
VID.1../11111
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(SOURCE)
R75 R55 R49A
15K 41 33K 210
V3B211/2 81131
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1442 1149
1100
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(SOURCE)
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27
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100K
V622JR6
HOR.
DO NOT MEASURE OUTPUT
0 1K300 6
1130R:81
,
C67 C40.1T C412
7
.01 220 3900-250
RT1A R41 # Is s R5418K 8.2K 1680K
9
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C68
00 .1001
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560R73 R74
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1143 1444 M45 WD48- IP 111.41*...
WIDTH 40J >--Vi V1113
V R T
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M33 1M46
OR
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OUT
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2701
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TO V7- PIN (7-7',
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.0041/s
R85fROOK80
20°
TO 146
1455 +1450
C56 R84
.02 47KI/4W 1
(-C57
f00K t/4
111-ts
.005 M531
.R86I2KI/4W
TO NSA
2
VR102
3 BRIGHT
9
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1138TO 106
114311
M32 ,,
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82(34(111 tHlr*
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R26
3A M62141811M
MI8 1463_
500K1VERT.
SIZE
*150PF USED WITH 19DUP4
tzoPf USED WITH 2ORP4AND 19%1CCP4
TO M53
RISC
1.51
M3
N CR
4
6
64t
IVhT
M60
IIW
TO 1154
5011F
COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
TO +1400 le
O 2V P/P,15.750Hz
® 95V P P,15,750Hz
0 12.5V P/P,15,750Hz
0 17V P/P.15,750 Hz
O 50V P/P,60Hz
O 30V P/P,60Hz
O 1.9V P/P,15.750 Hz
0 1.9V Pl.. 15.750HzExpanded View ofHor. Sync. Pulse
0 14V P/P (min. contrast I90V P/P (max. contrast)15,750Hz
O 17V P/P.15, 750 Hz
O 30V P/P.15,750Hz
@ 16V P/P,60Hz
@ 1150V P/P,60Hz
75V P/P,15.750Hz
CI 36V P/P,15.750Hz
0 130V P/P,15,750Hz
0 30V P/P.60Hz
@ 34V P/P.15,750Hz
1.9V Pz P. 15,750 HzHor. Sync. PulseShowing 4.5MHzTrap out of Ad,.
tJ
5051 P/P,15,750Hz
0 9V P'P15.750 H.
1Sioloo
0 15,750Hz, Loosecoupled to platelead of 22JR6
55V Sawtooth,80V P/P, 60Hz
I.
ru'rQD 11V P'P,
15,750Hz
TRANSISTOR & TUBE RESISTANCE CHARTS
All measurements are in ohms and taken with a B& K Model120 volt -ohm -meter with an allowable tolerance of ±20%.DC polarity switch set in "REV" position. Resistancemeasurements of transistors and tubes taken in circuitwith power off.
TRANSISTOR RESISTANCE CHART(USE 0100 SCALE)
OMMILIETERCONNECTION
1NOTE POLARITY)
01AUO. OR
TV17
coltd SIP
TV32
033rd SIFTV32
CO301 VIF11/64
011
ltd VIPTVS°
OSRF AGC
1V44
07181 VIFTVSO
oeGATETV17
oflst SIPTV32
Coll. Grd.- 22K 3.2K 5.5K 1.2K 8000 2.1K 1.2K 400K 7000
Emit. GM.- 1000 IA 1.89 2200 5e00 7500 2700 3.11( 4.7K
Soso GNI.- 1.9K 2.61( 2.6K 1 7K 2.4K 1.2K 1.21( 3.4K 2.7K
Coll. Emit.I-1 I.) 17K 3.5K 5.511 1 3K 1.3K 3.71( 1.3K 2.5K 5K- 22K 2.36 7K 1.3K 1.4K 2K 1.46 4091( 2.81(
Coll. BaseI-) I.) 1.711 1.6K 1.7K 1.6K 1.9K 4K 1.911 1.511 1.6K- 701( 71( 71( 2.8K 5.511 1.7K 2.4K 4001( 8201(
Mae . Loot.I-1 III 271( 8.5K 4K 2K 5.56 "750 I.6K 2.46 13K- 1.7K 1.76 1.8K 1.7K 2K 750 *1.2K 1.5K 1.6K
'use /MOO scaleVR2 num clockwtss
TUBE RESISTANCE CHART
sm.801 TUBE FUNCTION
PIN NUMBERS
I 2 3 4 6 8 7 9 9 To TT 12
VI 6A054 46.0.0 Outran 470K 1500 IC 171/ 2.5K A 2K 4700
V2 17923 011nIPI. oon 260 251) 2.1K 04F INF 2306 INF INF 20 INF 190
03,--v4
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J
COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802
1423SYLVANIAColor -TV Chassis
D18-1, -2, -3
JUNE 1972
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COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
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NOTES
EXAMPLE .200 -00. REFERS TO TRANSISTOR BETA RANGEE.- Oa/ LETTER AND NUMBER NEAR COMPONENT DESIGNATES
PRINTED CIRCUIT PANEL CO-ORDINATE
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56
COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN /DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
1424MOTOROLA
TV ChassisTS -467
JUNE 1972
ELECTRONIC 2/1-V=EFiel ji(COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5
KITES,VOLTAGE MLASUMEMINTS
1. TAW FROM POINT INDICATED TO CHASSIS 81711 A VTVti - ±209.
2. LINE VOLTAGE MAINTAINED AT 120V AC.
3. TAKEN RITZ CONTROLS IN NORMAL OPERATING POSITION4. MURK TWO VOLTAGES ARE =OWN
VOLTAGE ABOVE BOX - WITH NO SIGNAL INPUT, TUNER ON CHANNELWITII LEAST NOISE AND ANTENNA TERMINALS SNORTED.VOLTAGE IN BOX - WITR TUNER ON STRONG STATION AND ouTsIta ANTENNA.
W AVEFORM MEASUREMENTSI. TAW FROM POINT INDICATED TO CMASSIS WITS A RIDE -
RAND OSCILLOSCOPE.2. OSCILLOSCOPE SYNCED NEAR I 2 SEEM. RATE INDICATED.3. TAKEN KITH STRONG SIGNAL, CONTRAIT CONTROL AT
MAXIMUR ALL OTHER CONTROLS IN NORMAL OPERATINGPOSITION:
INDICATES VOLTAGE VARIES WITH CONTROL SETTINGS.UNLESS OTHERWISE SPECIFIED, CAPACITOR VALUES LESS THAN ONE
IN IF, ALL OTHERS IN PF. CAPACITANCE VALUES ONLY ARESHOVE ON RCREMATIC DIAGRAM. REFER TO PARTS LIST.
collsittst%141151TeSsIzilli ONE OHM NUT silovr,
E BIHDICATISPRINTED CINCUIT DOANE.
00Tvalo
01, Q2, 03, 08,010 THRU 015.81017 AND 018
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04
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VIDEO SUPPLYON PC PANEL
SW ON
VHF TUNER/
fR802 R8.01
33K 33K
A.1,'
PL80111
(fUHF /
P09 L802VHF
PILOT LIGHT CKT vvNOTNOT IN AIL SETS
NEW SETS
SYMBOL DESCRIPTION MOTOROLA PART NO.
C1303-20000/40., 1000pf/35.1000sif/29v IytiC .................... '23069772A04
F -800 -fuse, 3/4a 125v .........................65S136038L-111-4.5MHz trap, Inds core ............... 24D70374A01L-500-horiz °se, incls core ................. .24D68130A05L -700 -yoke, deflect 114° IC12TS-4671L -801 -choke. IMe ..........................'24069978A04R -112 -video bias, 50K ..................... '18066401A43R125 -contrast, 1K .........................'18D69773A02R -126 -brightness. 500K ...................... 18D69773A02
R -306 -volume, 50K 18D69773A028-602-vert hold, 250K 18067678812R-605-vert size, 25K 18001878B12R-1308-ven lin, 10K 1806E678812R615-varistor 6C66263A21T -100 -audio takeoff, incls cores .24D68822A09T-300-4.5MHz ratio detector °24D68822A 10T -301 -audio output "251367552A26T-500-horiz driver '25067440A10T-501-H.V. 'dormer, complete '24C0698213A047800 -power IC12TS-4671 251368499A05
01
AZT
1ST 4.5MHzAMP LIM
Q2
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2ND 4.5MHzAMP LIM
2.2TTOTAL IAA) VOLUME
03A3K
1ST AUDIO AMP
F800J 4A
IRI30 6.8
06A2Y
1ST IF AMP
113 g C109
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1415
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-++AV
1
4
ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by HARCOURT BRACE JO-VANOVICH PUBLICATIONS, INC., 1 East FirstSt.. Duluth. Minn. 55802. Subscription rates:One year $6. two years $10, three years $13,in the United States and Canada. Other coun-tries: One year $15, two years $24, threeyears $30. Single copies 75/$ in the UnitedStates, and $2 in other countries. Secondclass postage paid at Dansville, New Yorkand at additional mailing offices. Copyright1972 by HARCOURT BRACE JOVANOVICHPUBLICATIONS, INC.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HARCOURTBRACE JOVANOVICH PUBLICATIONS, INC.,I East First St., Duluth. Minn. 55802.
R3I3
E301
EARPHONE JACK
NOT ON ALL SETS
RII9 IM
NW: T
CI26 1722 1.8 TO _4 HER-1.1*A me 81
ii" 1,--
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2
BRIGHT?
R126 500K -1- E.'--Jsr
9200 IKTEL
20
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1
27.5V
OFFPANEL
1
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31 4
_tFOCUS
C604 .05
951356K
9515
C6081(3004F
VI12VABP4
0503
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0501
NE HORIZSIZE AELICSI
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+ AGC
_2311.15141
AGC 131*
1r ID502
Or I
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C51311
25MFII
L --- I
130V VIDEOB +
ca.1
0OA
COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH, MINNESOTA 55802
PROVIDES YOU WITH ACOMPLETE SERVICE FORALL YOUR TELEVISIONTUNER REQUIREMENTSAT ONE PRICE.
4111LTUNER REPAIR
VHF Or UHF Any Type $9.75.UHF/VHF Combo $15.00.
In this price all parts are included.Tubes, transistors, diodes, and nuvistorsare charged at cost.
Fast efficient service at our four con-veniently located service centers.
1 year guarantee backed up by thelargest tuner manufacturer in the U.S.-SARKES TARZIAN, INC.
All tuners are cleaned inside and out,repaired, realigned and air tested.
TSC
TlifilMFAC111661TReplacement Tuner $9.75.
This price buys you a complete newtuner built specifically by SARKES TAR-ZIAN INC. for this purpose.
The price is The same for every typeof universal replacement tuner.
Specify heater typeParallel 6.3VSeries 450 mASeries 600 mA
All shafts have tie same length of 12".Characteristics are:
Memory Fine TuningUHF Plug InUniversal McuntingHi -Gain Lo -Noise
If you prefer we'll customize thistuner for you. The price will be $18.25.Send in origi la' tuner for comparison pur-poses to oLr office in INDIANAPOLIS,INDIANA.
TUNER SERVICE CORPORATIONFACTORY -SUPERVISED TUNER SERV.TE
MIDWEST 817 N. PENNSYLVANIA ST., Indianapolis, Indiana . TEL: 317-632-3493(Home Office)
EAST 547-49 TONNELE AVE., Jersey City, New Jersey . TEL: 201-792-3730
SOUTH 938 GORDON ST., S.W. Atlanta, Georgia TEL: 404-758-2232
SOUTH-EAST 1505 CYPRESS ST., Tampa, Florida TEL: 813-253-0324WEST SARKES TARZIAN, Inc. TUNER SERVICE DIVISION
10654 MAGNOLIA BLVD., North Hollywood, California TEL: 213-769-2720... for more details circle 133 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 19
Our ECG 102A transistor replaces...
ICI:ttioplarties1111111
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Our new ECG semiconductor re-placement guide makes it easy foryou to find out exactly which one ofours is the one you need.
With our guide and our 124 re-placements, you can service prac-tically any solid-state entertainmentproduct on the market.
No more lugging sets back to theshop because you couldn't carry allthe parts you needed.
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Stock up on Sylvania ECG semi-conductors now.
It's just another small thing fromGTE Sylvania that can take a bigload off your back.Sylvania Electronic Components,Waltham, Mass. 02154
CLE4 SYLVANIA
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CO SYLVANIA
PHILLIP DAHLEN, C.E.T.Editor1 East First StreetDuluth, Minn. 55802(218) 727-8511
ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4839
TOM GRENEYPublishing DirectorJOSEPH ZAUHARManaging EditorBERNICE GEISERTAssociate EditorGAYNELLE DAVIDSONProduction ManagerJOHN PASZAKGraphic DesignLILLIE PEARSONCirculation FulfillmentJOHN KESSLERManager, Reader Services
MANAGERS
JIM SMITH, C.E.T.43 East Ohio StreetChicago, III. 60611(312) 467-0670
CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678
KEN JORDANDONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530
CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794
ROBERT UPTONTokyo, JapanC.P.O., Box 1717
ELECTRONICTECHNICIAN/DEALER
JUNE 1972 VOLUME 94 NUMBER 6
Some tired electronic technician forgot to turn his instruments OFF before leaving forthe night. More information concerning one instrument that didn't thus suffer from bat-tery drain is included in the report on page 57. Photo courtesy of Triplett Corp.
3 TEKFAX: Up-to-date schematics for easier servicing.
25 EDITORIAL: A Bunch of Snobs.
26 NEWS: Events of interest to our industry.
28 LETTERS: Pertinent comments concerning past issues.
30 READER'S AID: What you need or have ,or sale.
32 NEW AND NOTEWORTHY: Merchandise of special interest.
FEATURES
39 TEKLAB REPORT
Interesting features that we encountered when examining Philco-Ford's ModelC4870AWA Color -TV Set.
44 WHICH TAPE SYSTEM?
Some information with which you may more effectively assist your customers intheir selection of an audio tape system that best meets their personal needs.
46 TEMPORARY FIXES FOR ETCHED CIRCUIT MODULES
Suggestions for keeping the customer's circuitry functioning when bias conditionsare wrong-until an exact component replacement is available-by Norman Crow-hurst.
51 SERVICE CONTRACTS ARE BIG BUSINESS
Open the door to a lot of new customers by offering them the advantage of a
realistic service contract-by William Joseph.
54 PROTECTING BUSINESS RECORDS
Although we hope to never encounter fire, flood or vandalism, we must guard againstlosing one of our most important business possessions-our records. Ernest Fairtells why.
57 TEST INSTRUMENT REPORT
Reviewing specifications for Triplett's Model 603 FET VOM.
58 COLORFAX: Tips for easier color -TV set repair.
60 TECHNICAL DIGEST: Hints and shortcuts for more effective servicing.
61 NEW PRODUCTS: Instruments and components to make your job easier.
64 DEALER SHOWCASE: These items may increase your sales revenue.
68 ADVERTISER'S INDEX: Manufacturers concerned about you.
69 READER'S SERVICE: A source of additional information.
j A HARCOURT BRACE JOVANOVICH PUBLICATION ABP
HARCOURT BRACE JOVANOVICH PUBLICATIONS: James Milholland, Jr., Chairman; Robert L. Edgell,President; Lars Fladmark, Senior Vice President; Richard Moeller, Treasurer; John G. Reynolds,Vice President; Thomas Greney, Vice President; Ezra Pincus, Vice President; Bruce B. Howat, VicePresident; James Gherna, Vice President.
ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications.Corporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting, Ad Production and Circulation Offices: 1 East First Street, Duluth, Minnesota 55802.Subscription rates: One year $6, two years $10, three years $13, in the United States and Canada.Other countries: one year $15, two years $24, three years $30. Single copies: 75C in the U.S.and Canada; all other countries $2. Second class postage paid at Dansville, New York 14437.Copyright (c) 1972 by Harcourt Brace Jovanovich, Inc.
POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth,Minnesota 55802.
22 ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
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Introducing theexpensive curvetracer that doesn'tcost a lot.
The B&K Model 501A.It's a lab -quality instrument that provides fast analysis of all
semiconductors including J-FET's, MOS-FET's, signal and power bipolartransistors, SCR's, UJT's and diodes.
You can test transistors in circuit for GO/NO GO condition. Badlydistorted curves will indicate the stage where a defective transistor orother faulty component exists.
The 501A is complete-with scope graticule and FP -3 probefor fast, one -handed in -circuit testing. It generates true current and voltagesteps, with 3% accuracy, for measuring beta at all current levels.And it has a sweep up to 100 volts and100 milliamperes.
With the 501A, curves aredisplayed on an auxiliary scope screen.And you can hook it up to any scope-old or new.
All three controls can be set inquick -test positions to test and evaluate90% of all solid-state devices withoutmanufacturer's data sheets.
The 501A won't burn out eitherthe semiconductors or itself.
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... for more details circle 101 on Reader Service Card
24 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
EDITORIAL
A Bunch of Snobs
During mytravels as editorof ELECTRONIC
TECHNICIAN/DEALER, I have
had an oppor-tunity to makemany new andlasting friend-ships. I havefound thatelectronic tech-nicians and service dealers are typicallya friendly group, always ready to sharetheir time and thoughts. Not once haveI had the misfortune of personallyencountering an electronic technician orservice dealer that did not have atleast a few likeable traits. Not one hasacted like a snob in my presence.
However, during a recent trip toIndianapolis I had a lengthy visit with aservice dealer from some other partof the country who complained to meabout some snobs that are present inour industry. He spoke of the factthat some service dealers feel thatthey must act as though they aresuperior to the electronic techniciansthat they employ. They fear that givenany sign of respect, "their men," willbegin to attempt to run the store. Theytherefore severely limit any personalsocial contacts with their employeesand refuse to join any associations thattheir employees might possibly join.
This service dealer complained that inone part of the country the situationbecame so bad that one evening when agroup of service dealers felt compelledto attend a joint dinner with a groupof electronic technicians, they arrangedthings so that the electronic technicianssat on one side of the room and theysat on the other side-at tables slightlyraised above the floor level. If I had themisfortune of having to attend such a
function, you can be certain that Iwould pull up my chair with theemployees.
The service dealers that treat theiremployees with the least respect aregenerally the ones most fearful ofunionization. Yet, it is their overreactionthat may eventually force theiremployees to unionize.
Under some circumstances, I personallyfavor unions. I have been a unionmember and had hoped that the unionwould be more successful in its attemptsto organize one company where I hadbeen previously employed. Why? BecauseI felt that the job situation andemployer attitudes warranted it. How-ever, I also feel that the circumstancesare different in the field of electronicservicing. There salary and promotionsshould be based entirely on one'sservicing skills-not merely the lengthof time one has been able to stickout the job. Our profession requirestoo much use of the "independent spirit"for unionization to be desirable orpractical-unless some snobs (due totheir lack of personal security) makeworking conditions so bad that theiremployees have no choice but tounionize.
Our Duluth office has had a history ofinformality. Here everyone-the runners,clerks, computer programmers, editors,publishers and even the president-work together on a first -name basis. I
have become so accustomed to suchinformality that I personally feeluncomfortable anytime someone calls me"Mr. Dahlen." It's "Phil" to everyone(no one can pronounce my last name-Dah-Lane-correctly anyway). But suchinformality has not resulted in a lossof personal respect.
A good example of a company that hasnot needed unions is Eastman Kodak
Co., Rochester, N.Y. My grandmother andher sister retired from there. I havecousins working there now. Why nounion? Because the company demon-strates an interest in its employees. Itsponsors employee photography clubs,travel groups, has an employeeauditorium and recreational facilities.Since no union could get them more,they haven't unionized.
Service dealers that demonstrate apersonal interest in electronic techni-cians, encourage and support theirmembership in professional associations,and pay them a just wage (and I don'tmean giving the shop away), have noneed to worry that their employees willeither form a union or turn a professionalassociation into a union. Suchenlightened service dealers will makecertain that unionization isn't worth theeffort-and all will benefit.
The service dealers that I know are nota bunch of snobs. They, and theprofessional electronic technicians thatthey employ, are concerned with up-grading our industry-not only becomingbetter professionals themselves, buthelping the shop down the street dothe same. There is enough business inelectronic sales and servicing to keepeveryone gainfully employed. With theuse of proper professional skills, weshould be so busy ringing the cashregister that we haven't time to worryabout personal egos.
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 25
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26 I ELECTRONIC TECHNICIAN/ DEALER, JUNE 1972
NEWS OF THE INDUSTRY
Indianapolis HostsAssociation Activities
On April 21, 1972 the Indiana Electronic Service Assn.was host to the NEA Quarterly Board of Directors Meeting,followed the next two days by the state association's an-nual convention.
Those arriving early on Thursday, April 20th, attendedan afternoon tour of the RCA Color Picture Tube Plant inMarion, Indiana-bus transportation being provided byRCA. For everyone, including your editor, the tour was anextremely educational experience. Although we all hadsome understanding of the basic design and function ofColor -TV picture tubes, we found that a great deal morecould be learned by observing these efficient, well -lightedassembly lines.
Upon returning to the Ramada Inn where associationmeetings were held, everyone present was invited to a largeRCA smorgasbord -style supper that could satisfy the hardi-est appetite of any electronic technician or service dealer.
Later that night, while visiting in the hospitality center,your editor was publicly challenged by a disgruntled cer-tified electronic technician. Did the editor actually knowenough about electronics to be able to pass a CET exami-nation? With the reputation Of ELECTRONIC TECHNICIAN/DEALER at stake, the editor proceeded to take the examina-tion-despite the late hour (nearly 11:00 p.m.), havingbeen up much of the previous night with a crying baby,and not studying for the examination. With all of thesehandicaps, the score wasn't great, but he did pass theexamination.
Although many topics were covered during the Fridayboard meeting, the greatest attention was given to the con-sideration of a new constitution, which will be presented tothe members of NEA at the joint convention in New Or-leans in August.
That afternoon there was a very interesting tour of theHoward W. Sams Co., where we were able to observe howthey tear down consumer electronic products, photographthem, sketch the circuitry, draft schematics, and then finallyprint the SAMS PHOTOFACT. This was followed by a veryenjoyable lunch in the company cafeteria.
At the evening banquet Morris L. Finneburgh, Sr.,E.H.F., gave an impromptu speech. A surprisingly largeportion of his talk concerned ELECTRONIC TECHNICIAN/DEALER'S assistance in promoting Independent Service.
On Saturday there was an ISCET board meeting whichyour editor attended, plus a business school that Mr. Finne-burgh covered. Mr. Finneburgh reported that the material-which was presented by Les Nesvik, and which will bepresented again at the joint convention-was of excep-tional quality! A must for any service dealer!
Phillip Dahlen, your editor, was the Saturday eveningbanquet speaker. Although much of his speech concernedthe future of electronic sales and servicing-covering ma-terial similar to that in the May Editorial-an addendumto the speech stressed the importance of uniform servicingstandards across the nation and the tremendous need for aunited professional service association that could under-write its own insurance needs, correct the parts problemand have considerable influence over the quality of elec-tronic products placed on the market.
On Sunday the IESA had a breakfast, conducted its busi-ness meetings, and concluded with a luncheon.
Phillip Dahlen, editor of ELECTRONIC TECHNICIAN/DEALER, speaking atthe Saturday evening banquet. Photo courtesy of Dick Gloss, CET.
PTS Electronics ExpandsTo Offer Tape Deck Service
PTS Electronics, Inc., has announced that in addition toservicing TV tuners, their services have been expanded toinclude the repair of all eight -track and cassette tape decks.These units can reportedly now be repaired at any of theirbranches within 24 hours for $9.95 plus parts and shipping-all work being guaranteed for 90 days.
Second T DayScheduled for June 15th
With the first T day being such a great success, plans arenow underway for a second T day on June 15, 1972. Thosewho have not yet taken the test should investigate now, be-fore this second date also passes by.
This month we are printing Part IV in a series of ques-tions and answers that are of the same type as those in thesection of the CET Exam entitled, "Transistors and Semi-conductors."
Section IVTransistors and Semiconductors
1. What do the initials MOSFET and IGFET mean?2. Why must the MOSFET have special care in handling?3. Gate current can turn (orr/oFF) an SCR.4. What phase relationship exists between an input signal
and output signal of a common -base transistor amplifier?5. A varactor diode is normally reverse biased. True or
FalseExplanation
1. MOSFET are the initials for metal -oxide -semiconductorfield-effect transistor which is sometimes referred to asan IGFET, insulated -gate field-effect transistor.
2. Since the dielectric in a MOSFET is very thin, electro-static voltages can easily puncture it. Some of the newerMOSFET's have built-in diode protection.
3. On. Once an SCR is turned ON or fired, the anode -cathode current must be reduced to near zero in orderto switch the SCR OFF.
4. The common -base output voltage is in phase with theinput voltage.
5. True. A varactor diode depends on the depletion regionacting as a dielectric. Reverse bias is varied to vary thewidth of the depletion region to vary the dielectric-thus varying the effective capacitance.
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JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 27
LETTERS
umments concerning pastfeature articles, Editor's Memos, previousreader responses or other subjects ofinterest to the industry.
CB Article UnethicalReferring to your editorial in the
December 1971 issue, you state thatyou were shocked about a certain pub-lication that told John Q. Consumerhow to replace his own color picturetube. Well, I fully agree with you, itwas a stupid thing to do.
The reason I am writing to you isto say that I feel you made a blunderthat in comparison is just as big, ifnot bigger-publishing the article onhow to service CB radios in the Feb-ruary 1972 issue.
I base my opinion on several fact-ors, beginning with: Your articlestates, in one sentence only, that youmust have a First or Second ClassFCC Commercial License in order toadjust the transmitter-then tell, stepby step, how to adjust the transmitter.No where in the instructions or articledid I find the reason why a First orSecond Class Commercial License isrequired.
Nov RCAModule Caddy is
a take -everywhererepair shop.
Servicing most modular RCAcolor TV chassis is a snap withRCA's new Module Caddy. Itssturdy, compact plastic carryingcase, packed with 11 modules(one of each module used inRCA XL -100 solid state colorsets), plus Home Service Hand-book, lets you bring your shopright to your customer's set. Youjust find the defective module,snap it out and snap in a re-placement from the Module
Caddy. No wasted time and ef-fort on reschedules and call-backs. Makes servicing thosenew color sets a snap. See yourRCA Parts and Accessories dis-tributor, today. Or contact RCAParts and Accessories, Dept-ford, N.J. And get your owntake -everywhere color TV repairshop . . . RCA's new ModuleCaddy is a "must" for everyprofessional TV mu,technician.
The article doesn't mention the factthat the radio must comply with veryrigid tolerances set forth in VolumeVI, Part 95, Subpart C of the FCCRules and Regulations (as an ex-ample, the frequency is only allowedto deviate approximately 1350Hz outof 27,000,000Hz, a tolerance of only0.005 percent or 0.00005).
The article doesn't mention the factthat heavy fines can be incurred forviolation of FCC rules, and it doesn'tmention the fact that it takes fairlyelaborate equipment to insure compli-ance with FCC rules.
Your publication is aimed primarilyat the TV shops, you can plainly seethat by the nature of the majority ofarticles you print. And may I say thatit is a good publication for this pur-pose. However, if a person is properlyqualified and licensed to service CBsets, he certainly doesn't need thisarticle. He already has this informa-tion. If he didn't, he wouldn't have alicense. If a person is not qualifiedand licensed, then he has no businesswith this information or working onCB sets.
Speaking professionally as a FirstClass FCC Commercially Licensedtechnician who has specialized in CBrepair for approximately five years, Ican assure you that one of the majorproblems that I meet in my work isunqualified people butchering, and Imean butchering, or badly misaligningCB radios due to a lack of knowledgeor sophisticated test equipment orboth.
I close by saying, you've made myjob and that of other qualified, li-censed CB technicians just so muchharder, and I personally feel that youare assisting people in breaking FCCrules by intriguing unlicensed person-nel with articles of this nature.
ROBERT D. PARSONS
No Business Printing CB ArticleI feel that you really goofed in the
February issue of ELECTRONIC TECH-NICIAN/DEALER by printing the articleon servicing CB radio.
In the past you have taken a standagainst the newsstand electronic pub-lications for furnishing the informa-tion for home TV service to the gen-eral public and encouraging such ac-tion in spite of the hazards to life,health and property involved. In yourarticle on CB service, you have donea similar thing by showing thousandsof technicians how to service CB ra-dios in spite of the fact that they maynot be legally qualified to performthese services unless they hold a cur-rent FCC Commercial First or SecondClass Radio Telephone license andown FCC approved test equipment.
. for more details circle 124 on Reader Service Card28 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
In the February article by C. A.Tuthill, you have a mild warning ofthe FCC requirements, then you pro-ceed to furnish rather complete ser-vice information-including transmit-ter alignment. The article was quitewell written and should provide all theinformation necessary for many TVservice people to repair the HB 625transceiver and other similar units-and then promptly end up in a federalpenitentiary and/or pay a stiff fine ifthey do not hold a current FCC li-cense of the proper class, and theFCC decides to make an example oftheir case.
As a holder of a current FCC FirstClass Radio Telephone License andformerly working in the two-way ra-dio field, I am quite aware of whatsomeone must do to service any two-way radio. First, he must have aproper license, which requires con-siderable study and knowledge. Thenhe must obtain the proper FCC ap-proved frequency and modulationmeters, besides the normal electronicrepair instruments. The specializedtest equipment alone can cost severalthousands of dollars.
Presently, I am actively engaged inCATV, MATV and TV -set sales andservice, but do not service CB radiobecause I do not feel that I can handlethe volume of CB work necessary topay for the specialized equipmentneeded for CB-on top of my otherwork. If I cannot service equipmentproperly and legally, I would rathernot risk the penalties that might beinvolved.
I would strongly suggest that otherelectronic technicians keep "handsoff" CB radio unless or until they areproperly licensed and equipped to dothis work legally. The FCC penaltiesare too strict to ignore.
I would also feel a lot better aboutELECTRONIC TECHNICIAN/DEALER ifyou did not furnish the informationto electronic technicians to serviceequipment that has special license re-quirements for service. In spite of thefact that most technicians are honest,the sad fact is that some are not, andthere is a strong possibility that yourarticle may encourage more abuses inan already very badly abused area.Most reputable manufacturers willfurnish service information to quali-fied service facilities. Perhaps in thisarea it would be better not to publishinformation that could be used il-legally.
There are many other areas of in-terest and profit making potential thatcould be covered in future articles indetail, without encouraging illegal ac-tion. These include: CATV service,MATV service, commercial sound,background music, home and business
security systems, home and businessintercom systems, depthfinders, elec-tronic music instruments, etc.
C. ROBERT PARSONS
Bob phoned us at his own expenseright after the February issue cameout; and although we did not com-pletely agree with his position, we re-quested that he send us this letter sothat other readers would become bet-ter aware of the dangers of servicingCB transceivers when not qualified.
We are in complete agreement withBob when he says that you must keepa hands-off policy unless you are li-censed and your shop is adequatelyequipped. We were probably in error
in not stressing this point more in theCB servicing article.
We still hold to our previouslystated position that no publication(newsstand or otherwise) is respon-sible if it encourages people off thestreet, or even unqualified electronictechnicians, to attempt jobs that theyare not technically or legally qualifiedto handle.
We have provided CB servicing ar-ticles for two purposes. First to showthe unqualified electronic technicianshow easy CB servicing is-thus en-couraging them to enter the field oncethey have become licensed and obtain-ed the proper instrumentation. Sec -
continued on page 66
As fast as you get 'emwe help you fix 'em
(-\ 'n
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with an RCAICTJ system
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Sound like the TV serviceman's dream? It is. RCA's Industry CompatibleTest Jig is a complete testing system that lets you service more than90% of all color TV console chassis on the market-and updates youas new ones come along.Here's how: The RCA ICTJ system includes the test jig itself (in benchor portable models), your choice of 102 adaptors and cables, plus ahandy cross-reference manual that specifies the right adaptors foreach set. But most important, as the new models need service, you'llbe kept up to date with new inserts for the manual and any necessarynew adaptors will be made available. So whatever's coming, you'llbe ready.See your RCA Parts and Accessories distributortoday for full information. RCAParts and Accessories, Deptford. New Jersey 06096
. . . for more details circle 125 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 129
READERS' AID
Space contributed to help serve thepersonal needs of you, our readers.
For Sale
I have back issues of ELECTRONICTECHNICIAN/ DEALER that I would liketo sell.
MRS. R. FLEISCHER68-30 Fleet St.Forest Hills, N.Y. 11375
I have the following available forsale: a marker adder, a crystal cali-brated marker generator, a sweepgenerator and a capacitor analyst. Allarticles are in excellent condition.Probes and manuals are included.
JEROME MEYER221 N. First St.Harbor Beach, Mich. 48441
I have 70 plug-in Crystals-mixedlot, plus an assortment of tubes forsale.
THOMAS E. DIXONBox 454Harvard, Nebr. 68944
CHEMYgERYOr, do you know all our secrets?
The other day, we got quite a shock. And the discoverywe made could mean $100 or more a week in addedsales to every serviceman in the country
In taking one of our regular surveys, we discovered thestartling fact that most servicemen are unaware of thebroad variety of chemical tools available today. Andthe profits they can build from the extra service callschemicals make possible.
Sure, you know about tuner degreasers and cleaner/lubricants. And what you know has made ChemtronicsTUN -O -WASH and TUN -O -FOAM the world's best-sellingdegreaser and cleaner/lubricant.
But if that's all you know about chemicals, you'remissing dozens of ways to save time, do a better joband make more profits.
LAUGH AT THE WEATHER KLEERSPRAY and NO -ARC will help.
GRIME GETTER Our TUN -0-BRITE has a controlled polishing
since they re both excellent
action that powers stubborninsulators and weather- proofers
dirt out of hard -to -reachBesides flybacks. antenna ter
contacts It's also good for Mom minds, splitters. feed-thru's andTW the like. you can use them on
unfreezing telescopic antes- il. ignition wiring, exposed metalsnas. locks. motor shafts and
even wood,more btuNEW LIFE FOR OLD RUBBER.*
WRENCH -IN -A -CAN PLUS-- i. DUSTZAPPER. TRACK RECORDS.CHEM OILS penetrating lubn 4 STICKY STUFF AND SALES As youeating action does thousands
erje
.
, --. ,,t can see, we have many moreof lobs. from freeing frozen yokes 11
lend -a -hand products Toto un -squeaking hinges restore idler wheels and belts
Many servicemen buy three -one for shop, one. home. one It .:ciir, .--'-- performance of reel-to-reel,garage arir :-.-"-- cassette and 8 -track recorders
THE HOUR SAVER Take SUPER ....4.4-.3- 0 .
l,Clean records Repair and
FROST AID. for example It helps ,
.17C mend all kinds of materialsfind intermittents in minutes
*0_,1 i_i:,
11ii - iivioxik And even sell to customerswhile you're in the shopinstead of hours But servicemen kl211,1
have also used it as a portable or On call.\ ._---fr!. ,
small -fire extinguisher, blister- ipreventer (used on minor burns 1. For more information about our
immediately). heatsink before.. ,
professional chemicals, andideas on how to make moneysoldering and even chewing
I . with them, see your localgum remover (cold makes gumbrittle) Chemtronics distributor Or
write to us for a catalogPUSHBUTTON PEACE & QUIET ,,.,_. After all, isn't it worth 8c to tind outOne spray of SUPER TROL AID or more ways 52 79 can get youCONTACT KLEEN quiets noisy 550 001pots, switches and relays Someservicemen make a lot ofmoney "curing" noisy transistor CHEIATRONICSradios. balky dimmers. antenn,: INCORPORATEDrotors ever thermostats Not tomention tape recorders. CB 1260 RALPH AVE . BROOKLYN. N V 11236sets. marine radios Our business Is Improving yours.
I have 962 Sams Photofact sets thatI would like to sell (as a group only).They date back to set No. 1. The last400 sets have never been used. All setsare in excellent condition. If anyone isinterested I would be glad to stateprice, etc.
GEORGE F. POM IAN1723 Catalpa Ln.Mt. Prospect, Ill. 60056
1 am closing shop due to illness, andam selling my Sams folders for $1.00each. Send the list numbers needed.
DUTCHESS RADIO SERVICEBox 105Flushing, N.Y. 11355
WantedI would like an RCA WR 99A crys-
tal calibrated TV marker generator.MICHAEL BRADY
R. A. V. Service461 North HarperLos Angeles, Calif. 90048
I would like used Sams A. R. man-uals to complete my set.
PAUL MER WILLIAMS106 South Jefferson St.Lewisburg, W. Va. 24901
Literature RequestedI would like some free literature on
Moss Electric and their address if pos-sible. I sent a letter to their old ad-dress in New York as advertised in theolder magazines, but it was returned.I can't seem to find a new address forthis company. Can anyone help me?
ROBERT J. BROWNRoute 2, Box 186Sparta, Wis. 54656
Schematics AvailableNoting the upsurge in antique radio
and being antique enough to remem-ber back when, we have schematics onAtwater Kent from No. 10 to No. 85-and in fact-almost all of a con-temporary period. We also have a Ri-ders No. 1, published in 1933, alsofactory data. We have almost everyRCA from Model 16 dated 1928 toModel 240, dated 1934. If any enter-prising antique radio fan or societywill guarantee safeguards on return,they can xerox the entire works forfree distribution as these are all copy-righted and we do not know if theserights have terminated by law; or elsewe will sell the books outright-butnot in the nickel and dime bracket.We are about to catch up on fortyyears of missed fishing and sailing.
R. L. Ems17 S. Walnut StreetMilford, De. 19963
... for more details circle 104 on Reader Service Card
30 ! ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
"This pocket -sized masterpiece explains whatelectronics is all about...a marvelous littlebook..." Electronic Buyers' News
"For $2.95, it will takea novice from basicelectricity throughMOS and linear ICs...as good a basic bookas we've seen."Electronics magazine
Understanding Solid -State Electronics is a self -teaching text which begins at the beginning andexplains every new idea and technical subject interms you can understand.
This book was created for anyone who wantsor needs to understand solid-state electronics,but can't devote years to the study.
Texas Instruments prepared the course for itsown non -engineering employees and customers -and thousands have proven its effectiveness.
It's a practical course. Engineering conceptsare explained without using mathematics -justa little simple arithmetic. Technical terms areused, but each one is explained-in plain English.12 lessons plus quizzes,glossaries - 250 pagesThe lessons cover: What Electricity Does in EveryElectrical System Basic Circuit Functions HowCircuits Make Decisions Relating Semicon-ductors to Systems Diodes: What They Do andHow They Work Transistors: How They Work,How They Are Made Transistor Specifications
44.014.0.0re Oa C14.1. 10
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Chapter 10Introductionto
Integrated Circuits...... cwt... w weww.... dem en,..ie.wee
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Thyristors Optoelectronics Introduction toIntegrated Circuits Digital Integrated Cir-cuits MOS and Linear Integrated Circuits.Award -winning courseTens of thousands of readers have followed theserialization of this book in Electro-Procurementmagazine-for which it won the 1972 Jesse H.Neal Editorial Achievement Award, the"Pulitzer Prize" of the business press.
Send coupon today for your copy
r Texas Instruments Learning CenterI P.O. Box 3640 Dallas, Texas 75222
LEARninGamen
Please send copies of Understanding Solid -State Electronics. I have enclosed $2.95 for eachcopy ordered (check or money order only). Total amountenclosed is $
NAME
ADDRESS
CITY _STATE__
TEXAS INSTRUMENTS
ZIP WJ
INCORPORATED... for more details circle 131 on Reader Service Card
11120
JUNE 1972. ELECTRONIC TECHNICIANiDEALER 1 31
NEW AND NOTEWORTHYFor additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.
TV AND FM ANTENNA 701Slips down and fastens
for easy traveling
The Speedi-Tron, a new TV and FM antennais designed for campers, trailers, motor
homes and boats. It slips down and fastensfor easy traveling in seconds, and anchors
safely for freeway speeds. There are nogadgets or contraptions to tie down. The
antenna is for both B/w- and color -TVreception -82 channel UHF/VHF/FM.Specifications indicate that the antenna is
light, strong and safe, and that the completekit, including lead-in wire, retails for $10.00.
Antenna Corporation of America.
MARINE VHF RADIOTELEPHONE 700Includes a 115v ac power supply
The Bimini VHF is a marine VHFradiotelephone for use as a limitedcoast station. This high -power (25w)six -channel VHF unit is available forship -to -shore use for organizationsthat qualify for limited coast stationslicenses. A 115v ac power supply hasbeen developed for use with theradiotelephone. The combinationpackage sells for under $300.00.Pearce -Simpson, div. of Gladding Corp.
FOR MORE
NEW PRODUCTSSEE PAGE 61
AM/FM FUNCTION GENERATOR 702Can sweep its sine, square and triangular wave outputs
The Model 748 Function Generator offers broadband AM, FM and phaselocking capabilities as well as a combination of these. It provides sine,square, and triangular outputs that may be swept or FM'd, gated or phaselocked over a directly dial controllable frequency range from 1Hz to2MHz. In addition, the sine -wave output may be amplitude modulated withsignals from dc to 2MHz. It has a front panel AM input; dc -offset output -level controls; rear panel sync and tone burst inputs; low range, LowFREQUENCY EXPAND switch; and constant -amplitude square and sine -waveoutputs. Output amplitude may be varied over a 60dB range withoutaffecting the percentage modulation. Carrier suppression as a DSB modulatortypically exceeds 46dB to 4MHz. Phase lock capability allows theinstrument to function as a synchronous detector that recovers the carrierfrom the incoming signal by locking its internally generated sine wave to theincoming carrier. Since two Model 748's may be easily synchronized 90°out of phase, they form the basis for a low distortion, broadband, filterlessSSB generator. As an ordinary AM modulator, typical distortion for a100% modulated 200kHz carrier is -52dB or less. As a programmablesine -wave source, the linearity of the instrument is better than 1%. Price:$515.00. Clarke -Hess Communication Research Corp.
32 ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
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OFTHESEUNIQUE yours for onlyBOOKS ... with Trial(Combined List Price $33.85) Club Membership
May we send you your choice ofany three books on the facing
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Here are quality hardbound vol-umes, each especially designed to helpyou increase your know-how, earningpower, and enjoyment of electronics.
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Whatever your interest in electron-ics-radio and TV servicing, audio andhi-fi, industrial electronics, communi-cations, engineering-you will findthat Electronics Book Club will helpyou.
With the Club providing you withtop quality books, you may broadenyour knowledge and skills to buildyour income and increase your under-standing of electronics, too.
How You Profit From Club Membership
This special offer is just a sample ofthe help and generous savings theClub offers you. For here is a Club de-voted exclusively to seeking out onlythose titles of direct interest to you.Membership in the Club offers youseveral advantages.1. Charter Bonus: Take any three ofthe books shown (combined values upto $33.85) for only 99e each with yourTrial Membership.2. Guaranteed Savings: The Clubguarantees to save you 15% to 75%on all books offered.3. Continuing Bonus: If you continueafter this trial Membership, you willearn a Dividend Certificate for everybook you purchase. Three Certificates,plus payment of the nominal sum of$1.99, will entitle you to a valuableBook Dividend which you may choosefrom a special list provided members.4. Wide Selection: Members are an-nually offered over 50 authoritativebooks on all phases of electronics.5. Bonus Books: If you continue inthe Club after fulfilling your TrialMembership, you will receive a BonusDividend Certificate with each addi-
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Yes, if you fill in and mail the membership ap-plication card today, you'll also get this BonusBook, FREE!
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tional Club Selection you purchaseFor the small charge of only $1.99,plus three (3) Certificates, you mayselect a book of your choice from aspecial list of quality books periodical-ly sent to Members.6. Prevents You From Missing NewBooks: The Club's FREE monthlyNews gives you advance notice of im-portant new books . . . books vital toyour continued advancement.
This extraordinary offer is intendedto prove to you, through your own ex-perience, that these very real advan-tages can be yours . . . that it is pos-sible to keep up with the literaturepublished in your areas of interest ...and to save substantially while so do-ing.
How the Club Works
Forthcoming selections are describedin the FREE monthly Club News.Thus, you are among the first to knowabout, and to own if you desire, sig-nificant new books. You choose onlythe main or alternate selection youwant (or advise if you wish no bookat all) by means of a handy form andreturn envelope enclosed with theNews. As part of your Trial Member-ship, you need purchase as few as fourbooks during the coming 12 months.You would probably buy at least thismany anyway . . . without the sub-stantial savings offered through ClubMembership.
. mited Time Offer!
Here, then, is an interesting oppor-tunity to enroll on a trial basis ... toprove to yourself, in a short time, theadvantages of belonging to Electron-ics Book Club. We urge you, if thisunique offer is appealing, to act
promptly, for we've reserved only alimited number of books for new Mem-bers.
To start your Membership on theseattractive terms, simply fill out andmail the postage -paid airmail card to-day. You will receive the three booksof your choice for 10 -day inspection.SEND NO MONEY! If you are notdelighted, return them within 10 daysand your Trial Membership will becancelled without cost or obligation.Electronics Book Club, Blue RidgeSummit, Pa. 17214.
Typical Savings Offered ClubMembers on Recent Selections
Commercial FCC License HandbookList Price $8.95; Club Price $5.95
RCA Color TV Service Manual-Vol. 2List Price $7.95; Club Price $4.95
Citizens Band Radio Service ManualList Price $7.95; Club Price $4.95
How to Use Color TV Test InstrumentsList Price $7.95; Club Price $4.95
FET Applications HandbookList Price $14.95; Club Price $9.95
Fire & Theft Security SystemsList Price $7.95; Club Price 53.95
Modern Radio Repair TechniquesList Price $7.95; Club Price $4.95
Beginner's Guide to ComputerProgramming
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TechniquesList Price $7.95; Club Price $4.95
Zenith Color TV Service Manual-Vol. 2List Price $7.95; Club Price $4.95
Transistor Projects for Hobbyists& Students
List Price $7.95; Club Price $4.95Electronic Musical Instruments
List Price $7.95; Club Price $4.95Electronic Designer's Handbook
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SENDNO MONEY! Simply -fill in and mail postage -paid Airmail card today!
34 ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
Color TV Trouble Factbook Basic Electronics Problems Solved 199 TV Tough -DogProblems Solved
Here's a complete guideto color TV troublesand solutions, arrangedby make and model, alow-cost, all -in -one ref-erence handbook everyTV service technicianshould own. The infor-mation it contains mayeasily save you hoursof time repairing a"tough -dog" color TV.Included are detailsconcerning repetitivetroubles, field -factory
changes, new and unusual circuits and de-scriptions of how they work, special adjust-ment procedures and other such pertinent ser-vice information. The content is arranged bybrand names, covering every major make ofcolor TV receiver produced in the past severalyears. Models and chassis covered are arrangedin alpha -numerical order. 176-pps. Hardbound.
List Price $6.95 Order No. 519
Philco Color TV Service Manual
PHILCO
COLOR TV SERVICE Y:.NuAL
111
. ....
An all -in -one serviceguide for Philco colorsets, with 12 completeschematic diagrams forchassis 15M90/91 to20QT88. Here in onemanual is completeservice data for all thecolor models producedby Philco and PhilcoFord (thru 1970), fromthe all -tube to the lat-est hybrid solid-statechassis, including thesmall -screen portable
Model T5062WA. The unique 36 -page foldoutsection contains 12 complete schematic dia-grams, representing all the chassis covered.The profusely illustrated text delves into eachsection (video, chroma, vertical, horizontal,etc.), and points out specific problems based onthe author's extensive experience. Includedare complete alignment and setup instructions,detailed in step-by-step form. 160 pps., plus36 -page schematic foldout section. Long -lifevinyl cover.
List Price $7.95 Order No. 522
CB Radio Operator's Guide
ak
CB RADIO
OCeralJrs Gale
Ran
An all -in -one handbookon Citizens Band radio,and how to make thebest use of availableequipment. Tells youeverything you mustknow to get on the air,with complete detailson what you can andcan't do right down tothe "nitty gritty" rulesand regulations I What'smore, you receive ex-pert advice on the typeof equipment to buy.
and how to get the best performance out ofyour "system." The information contained inthis book will save you time and money inshort order! With this one book, you can be-come an expert on CB Radio, and how to usethe service most successfully. You'll learnabout antenna systems, including how theyare used in CB. 224 pps. Hardbound.
List Price $7.95 Order No. 499
SEM
Here are easy step-by-step solutions to basicelectronics problems ina convenient one -stopsource dealing with bothsolid-state and tube -typecircuits. The contentnot only presents a de-tailed explanation ofeach point, but also pro-vides many actual ex-amples on how to workout problems. Then, tofirmly fix the informa-tion in your mind,
there are numerous example problems for youto solve; answers to these are included in oneAppendix, and worked out solutions in another.Covers DC circuits, AC circuits, powers of ten,semiconductors, power supplies, and receivercircuits. A final chapter shows how to use aslide rule to speed calculations. 192 pps., over100 illus. Hardbound.
List Price 57.95 Order No. 530
101 TV Troubles: From Symptomto Repair
101
TV gyps
BY Alit PA ASIGOLIS
An invaluable "causeand cure" guide to thepractical, easy solutionfor virtually any TVtrouble-color or B&W.All you do is analyzewhat you see and hear,look up the symptomsin the book, and followthe clear and simplesteps to a speedy trou-ble cure, To show howand why certain trou-bles occur in specifictypes of circuits, sche-
matics and other illustrations are included forevery major manufacturer-Admiral to Zenith.TV troubles are broken down into five basiccategories: Brightness, Contrast, Sweep, Color,and Sound. Each category lists specific trou-bles relating to that symptom. For example,under "Contrast" are 22 causes of actual pic-ture problems. With the categorized troublelist and index, you can quickly and easilyfind the exact symptom-and the trouble cure-for virtually any TV circuit defect youmight encounter. 224 pps. Hardbound.List Price $7.95 Order No, 507
How To Fix Transistor Radios &Printed Circuits
in IP IR
TRANSISTOR
RADIOS &
Prioled
CircollsMVO Z81E11141
If Ellen WI
Here it is! Just off thepress-a completely up-dated, revised edition ofLeonard Lane's best-selling classic on tran-sistor radio repair. Inaddition to extensiveenrichment of the firstedition, the authorbrings FETs, zener di-odes, FM radios - infact, everything relatedto the current state ofthe art-into the pic-ture. Here's the perfect
reference and guide for electronic technicianswho need to understand and repair semicon-ductor circuits efficiently. For those interestedin transistor physics, fundamentals are em-phasized in the first two chapters. The real"meat" begins in Chapter 3 which will thor-oughly familiarize you with amplifier funda-mentals, basic circuit configurations, biasing.FETs, JFETs and IGFETs. The next twochapters will acquaint you with RF and IFamplifiers. 256 pps., over 150 illus., 12 Chapters.
List Price $7.95 Order No, 504
Here is a master collec-tion of actual case -his-tory solutions-answersto the most challengingtough -dog TV problemson both color and B &W sets-covering allpopular makes fromAdmiral to Zenith. Thisnew book is organizedso that you can quicklyfind the solution toparticular problems -toughies that requiredthe best efforts of top
technicians to solve. To enable you to find in-formation relative to a particular problem ina specific set, a cross-reference of troubles bybrand name and chassis is included. The con-tent is organized into trouble symptom sections.Several different circuits are included; thus.the information provided will apply to similarcircuits in other models. 256 pps., 199 illus.Hardbound.
199 TV TDUGHDOGPRO3LEMSSOWED
List Price 57.95 Order No. 559
TV, Radio, Hi-Fi Hints & Kinks
If you want to get thebest performance out ofconsumer electronicsequipment, you'll findthis to be the most in-formative and usefulhandbook ever pub-lished. Over 150 ideassuggest ways to custo-mize and add accessor-ies to any equipmentsetup-how to connectsingle and multiple ac-cessory speakers, how toadd remote controls I.,
TV's, radios, hi-fi systems, how to connectmicrophones, etc. Also includes many tips onhi-fi equipment, CB and 2 -way radio equip-ment, antenna systems, remote monitoringtechniques, intercoms, a wireless baby sitter,telephone amplifier, moisture, fire and otheralarm accessories for any existing amplifier.2..56 pp,. over 150 illustrations. Hardbound.
TV -Radio & Hi-FiHINTS &KINKS
List Price $7.95 Order No. 561
Electronic Circuit DesignHandbook
New Fourth Edition -A brand-new, enlargededition of the ever pop-ular circuit designer's"cookbook," now con-taining over 600 provencircuits, for all types offunctions, selected fromthousands on the baskof originality and prac-tical application. Nowyou can have, at yourfingertips, this careful-ly -planned referencesource of tried and
tested circuits. Selected from thousands sub-mitted by distinguished engineers, these"thought -starters" are a collection of originalcircuits selected on the basis of their useful-ness. This detailed compilation of practical de-sign data is the answer to the need for an or-ganized gathering of proved circuits . . . bothbasic and advanced designs that can easilyserve as stepping stones to almost any kindof circuit you might want to build, 384 pps.,19 big sections, over 600 illus., 81/4" x 11".
List Price $17.95 Order No, T-101
AIM EXTRAORDINARY :01Jd=11-; .. for more details circle 102 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 37
Fast heat-up. The Weller" AutomaticGlue Gun heats up nearly three times faster thanthe other gun. And an indicator/work light tellswhen it's ready. Your customers get hot glueinstead of getting hot under the collar.
FaStoocclUffig. Our Gun is slim, well-balancedand g -looking. There's no awkward trigger tosqueeze because glue feeds automatically. There'sno mess because our tip is dripless. And in recenttests, we found that Weller glue sticks bond betterthan any other glue sticks around.
Fast selling. Dealers everywhere arediscovering that our glue gun really moves. It'seasy to promote because our 50/50 Co-op programsupplies you with everything you need. And withWeller, you sell a kit, not just a gun. A complete kit( gun, glue, caulk, instruction book, stand andcarrying case) that won an award for excellencein package design.
Quick! Join the Group.The Cooper Group is Crescent, Lufkinand Weller. Top -name, top -profit productsthat are backed by strong consumeradvertising and publicity campaigns, ourCertified Dealer Program and modernmerchandising techniques.If you're looking for the fastest profits in
town, contact your distributor, orThe Cooper Group, P.O. Box 728,Apex, No. Carolina 27502.
41COOPERINDUSTRIES
The3_O secs-,
WellerAutomaticGlue Gun Kit
The Cooper GroupCRESCENT LUFKIN WELLER
... for more details circle 106 on Reader Service Card
ELECTRONIC TECHNICIAN/ DEALER JUNE 1972
TEKLAB REPORT
Philco-Ford's Model C4870AWAColor -TV Set
Now two tiny integrated circuits mounted
in their own individual plug-in sockets make up most
of the chroma and sound circuits
Many television dealers are re-porting that portable color -TV setsare becoming a major part of theirsales volume. And Philco-Ford hasstrengthened its selection of portablescreen sizes by adding a 19 -in.(measured diagonally) color -TVset. Each year we find more andmore automatic electronic circuitsadded for a more precisely tunedpicture, and which help do awaywith tuning confusion. "Philcomatic"is Philco-Ford's trade name for thenew simplified color tuning in theModel C4870AWA portable color -TV set described this month. It em-ploys the 22LT45 chassis, which inmany respects is similar to the20QT76 chassis with a number ofnew circuits -21 circuits providingautomatic functions.
As we unpacked the TV set,which included a deluxe rollaboutstand, we noted that the cabinet didnot have a single exposed control onthe front panel. The UHF, VHFchannel selectors, VOLUME, TINTand COLOR controls, plus the push-button ACT and ON/OFF switch,are hidden behind a panel doorwhich blends in with the cabinet.The VERTICAL, CONTRAST andBRIGHTNESS controls are located onthe top rear edge of the cabinetwithin easy reach. An externalspeaker jack is mounted on the frontof the cabinet next to the front -mounted 5 -in. oval speaker.
If servicing is required, just re -
by Joseph Zauhar
move five screws and slide the cab-inet cover off. The chassis is thenexposed, including the underside ofthe circuit boards for easy compo-nent removal. We also noted thatthe convergence board is placedaround the neck of the picture tube.This feature conserves cabinet spaceand requires only a short wire har-ness which is connected to the con-vergence board with an edge con-
nector socket. The convergenceassembly also includes the lateralmagnet and purity assembly.
The 22LT45 is a transformerpowered, hybrid color -TV chassisemploying 15 transistors, 3 integra-ted circuits and 7 tubes, excludingthe 19VATP22 picture tube. Thedeflection panel employs a 6JZ8vertical oscillator/output tube and atype 6BL8 horizontal reactance/
Philco-Ford's Model C4870AWA 19 -in. (diagonally measured) portable color -TV set includes a de-
luxe rollabout stand.
JUNE 1912. ELECTRONIC TECHNICIAN/ DEALER 39
oscillator tube. The horizontal cir-cuit employs a 6JS6A horizontaloutput tube, 6CG3 damper tube,and a 3DC3 high -voltage rectifiertube. A 12GN7 video output tubeand a 6ML8 color difference ampli-fier tube are employed on the chro-ma and sound panel.
After we turned the TV set ON,a red indicator light on the controlpanel caught our eye. According tothe manufacturer, this indicator,part of the "Philcomatic" system,glows when a color program is beingreceived. This color indicator can
The front panel customer controls include a
"Color Lite" indicator. When the control paneldoor is closed, all controls are hidden.
also be used as a tuning aid for thecustomers. As we misadjusted theFINE TUNING control, the indicatorlight went out. This light is used inconjunction with the Auto -LockChannel Tuning (ACT), which finetunes the picture. When the light isori, we are receiving color and thepicture is properly tuned. This fea-ture can also be used as a serviceaid in isolating chroma troublesahead or behind the color IC.
The rear cover has been removed and the TVset tipped on its side for the easy removal ofcomponents.
Rear view of the compact 22LT45 color -TV chassis showing the service adjustment controls.
As we review some of the newcircuits, they can be followed in theFebruary Tekfax schematic, No.1401. To make servicing of thischassis even easier, not only thewaveforms and voltages are shownon the schematic and service infor-mation, but the resistance measure-ments for the pins of the transistorsand tubes are also given with signalapplied and without signal.
Color Light Indicator CircuitThe color light circuit (Fig. 1) is
quite simple and consists of a tran-sistor (Q97) and a few resistors.This circuit operates in the follow-ing manner: When chroma sidebandinformation is present, the secondchroma stage, transistor 094, drawsenough current to drop the voltageat the junction of resistors R128 andR129. This negative -going voltageis applied to the base of a PNP tran-sistor, Q97, forward biasing it intoheavy conduction. As a result,heavy current flows from groundthrough the Philcomatic Lite, resis-tor R116A, transistor Q97 and re-sistor R114A to the 20v supply.This current causes the light to glow,and it will continue to glow as longas color information is present.
Video IF and Detector CircuitsThis chassis employs a transis-
torized three -stage video IF ampli-fier with maximum trapping used inthese circuits. The trapping includesa 47.25MHz trap at the first IF in-put. There are three stages usingthe 41.25 trap, two stages as part ofthe first and second video IF coils,plus the third video IF stage whichprovides improvement in 4.5MHzand 920kHz rejection. A 39.75MHztrap is also employed in series withthe output of the second detectordiode. The SOUND REJECT control isno longer used, but the 4.5MHztrap remains unchanged.
This chassis contains a completelynew chroma and sound circuit panel.Two new 14 -lead IC "H" chipsmounted in individual plug-in sock-ets are used to simplify servicing ofthis chassis. One IC is used as a4.5MHz amplifier/sound demodu-lator and the other is used as the3.58MHz oscillator/reactance/anddemodulator. Another feature,
40 I ELECTRONIC TECHNICIAN/ DEALER, JUNE 1972
which makes this board differentfrom previous ones, is the quad coilsound system used-instead of ra-tio -detector -type circuit.
The color IC has condensed thecolor circuits by eliminating three ofthe eight transistors previously em-ployed, plus the individual 3.58MHzcolor oscillator IC. The three tran-sistors that have been eliminatedare normally for the X demodula-tor, Z demodulator and buffer.
3.58MHz Oscillator, Reactanceand Demodulator Circuits
The basic circuit layout used inthe color APC loop (Fig. 2) is thesame as that used in the 22QT79/80chassis. The new color 1C (IC92) isshown divided into three distinctsections, the 3.58MHz chroma ref-erence oscillator with buffering, areactance element for reference os-cillator control, and X and Z chro-ma demodulators.
The chroma signals are appliedto the burst amplifier transistor,Q93, where burst separation is ac-complished. This burst signal is thencoupled to the color -killer and color -phase detectors. Two buffered out-puts from the 3.58MHz referenceoscillator, which is part of the IC,constitute the second signals appliedto the detectors. These 3.58MHzreference signals are appliedthrough Pins 4 and 5 of the IC.There is 0° and 180° phasing be-tween the burst and reference os-cillator to the color killer detector,and 90° and 270° phasing to thecolor phase detector. Correctionvoltage from the balanced colorphase detector is applied to thevaractor in the IC through Pin 2.
This correction voltage controlsthe frequency and phase of the ref-erence oscillator in step with theburst signal. The killer phase detec-tor output is a positive going dcvoltage, which is proportional to theburst amplitude and is applied tothe base of the color killer transis-tor, Q92, for ACC and color -killerfunctions. Chroma side band infor-mation is applied through Pin 7 tothe chroma demodulators in IC92.The tint control circuit-consistingof a potentiometer, VR201, in serieswith a 150pf capacitor and a 12phcoil-is placed between Pin 7 and
ground. Moving the potentiometerarm changes the phase of the chro-ma sidebands, altering the phaseangle of demodulation or correctingcolor -hue errors. Diodes D96 and
The convergence board includes tae lateralmagnet and purity assembly placed around theneck of the picture tube to conserie cabinetspace.
D97 are limiting diodes. One con-ducts on the positive half cycle ofthe chroma sidebands as soon as thejunction barrier potential of about.65v is overcome, while the otherconducts on the negative half cycleafter the signal overcomes the diodejunction barrier.
The B -Y and R -Y color differ-ence signals, removed from the ICat Pins 9 and 10 respectively, arethen applied to the color -differenceamplifiers, just as in other chassissuch as the 22QT79/80.
IC Color CircuitsWhen troubleshooting the color
circuits, it may prove helpful toknow how these circuits functionwithin and around the IC. Thendirect substitution is simplified byemploying a plug-in socket on the
PHILCOMATIC LITE
NN
M106
R1281K
094T V36
2ND CHROMAAMP
R116A390
R129A100
097HR71
PHILC3 MATICLITE AMP
C12720
05
R1291K
R114A15
C128.01
+20V
L96
2
CHROMAOUT
Fig. 1-The Color Lite circuit consists of a transistor and a few resistors. Courtesy of Philco-Ford
44.1:19.L.
1-T9i*COLOR KILLER
DETECTORr5
D96
To COLOR KILLEF., 092ACC FUNCTIONS
D97
TINT
25K 12111-1
T 095
BUFFER
COLOR PHASE I
DETECTOR
REACTCONTROLELEMENT
358MHzREF.OSC.
-
6V91M8
101 R -Yfr" AMPCHROMA G -YDEMODS. I AMP
1 91 B -YAMP
BUFFERIC92
Fig. 2-Block diagram of the basic circuit layout used in the color APC loop. Courtesy of PhilcoFord.
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 41
)1
C135 IC134 C144.01 T1000 100
_L--)1
9
10
11
1
13
14
OSC. OUT
C140,05
BYPASS
"Z" OUT
X" OUT
GND
'X" REF
"I REF
R1455.6K
- 1/;1 L100
358MHzI3I OSC. COIL
To B -YGRID
R143 I680
R140 C14156K 1001 To R -Y
GRID
L99 R1411 680 C1421 20 5.6K
R144
I 100
R146 -C14327K 115
Fig. 4-Simplified schematic of chroma integrated circuit 1C92 and associated circuits. Courtesyof Philco-Ford.
L6 DI
C14A10
SNDDET
1N6OD
To I
IC9145MH:
AMP DEMOD
GND
C991 9YPASs
C104.1 T
LREACT 05C OSC.
COOCT. KILLCO
C BROMAX INPUT Z
CONTROL OUT I OUT 2 REF REF REF REF
4
03
1K
2K 06 08
IK:04
02
07
0106
5.26 012
011
01314
ISK
BYPASS
030 16
015 016 017
3K
018
210 230
051
40 1K
020
1K
019
15K
210 230026 027
029
OUT
4Fig. 3-Schematic of the oscillator/reactance/demodulator, chrome integrated circuit (IC92).Courtesy of Philto-Ford.
D96i D97 C129I001
ToCOLORKIL +20VPHASE L96A
C131DE 82UH.01
T.
ToCOLORPHASE
DET.
R1171K APC REF CL._
R131 C132 BIAS 3
Raardj8.2K 47
To R132-+ I CR91XTAL
0
FROMR142 aTINT
CONTROL
1C92OSC /
REACT /DEMOD
B
ACC REF 5
BYPASS cji120 r- - '
4.5MHz e;
L93 --10001 ogSTO .1 _gm
- C101_Loatz
9
I?
13
14
+20V-,
T P
PRE -AMP OUT
4 SMHzOUT
0201AUD OUT
M954
M941
tR97 IC93 iR96):68K T.001 39
C96 R98PRE- .22 3.3K
AMPIN ,...C97 -
FA S 1-2 L92C951.05m 27
i 3eI
QUAD IN R96AI 68K I
1/4514_,
T
rI
C98,05 -I-
R1012.2K
M96'M98f
VR206
VOLO
ONTROL
1
chassis for the color IC.The small color IC chip (1C92-
Fig. 3) contains 26 transistors, 4diodes, 1 varactor and their associ-ated circuitry. A temperature com-pensated differential amplifier con-taining three transistors and twodiodes make up the color oscillatorcircuit included in the chip.
Within this oscillator circuit thereare four oscillator buffering tran-sistors. One pair of buffer transistors,Q6 and 07, are used to drive thephase detector circuitry. In Fig. 4 wesee that the phase angle of this sig-nal is controlled by a 47pf capacitor(C132), a 120µh coil (L97) and a8.2K resistor (R131) connected toPin 4 of the IC. The adjustable3.58MHz tank coil and associatedcapacitors are connected betweenPins 1 and 14 of the IC.
A second pair of buffer transis-tors (Fig. 3-08 and Q9) bufferthe oscillator to drive the color-kill-cr reference detector. The signalphase is controlled by coil (L96A)associated with the color -killer out-put/ACC-Pin 5 of the IC.
Transistors Q10, Q11 and Q12provide additional reference signal
1111111r1.71"11Focus voltage for the picture tube is obtained
Fig. 5-The 4.5MHz sound amplifier and demodulator integrated circuit, IC91, and associated from the focus bleeder resistor network mount -circuits. Courtesy of Philco-Ford. ed on the side of the high voltagecage.
42 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
buffering. Their output is applieddirectly to the X demodulatorthrough transistor 013, and shiftedin phase by an RLC network con-sisting of R146, L99 and C143connected between Pins 12 and 13of the IC. This network sets the de-modulator angle between the X andZ demodulator and is applied to theZ demodulator through transistor021.
Reactance control is maintainedby varactor VR1. This reactancecontrol is similar to the varactorcontrol operation used in the20KT40 chassis.
The X and Z demodulator portionof the IC is composed of 18 tran-sistors. The color reference oscilla-tor signal is injected into the basesof the X and Z input transistors, andthe chroma information into thebases of another two pairs of tran-sistors (the current sources) Q18and Q19, plus Q26 and 027. TheX and Z demodulated signals arefed to emitter -follower transistorsQ30 and Q29 respectively. The Xand Z demodulator outputs (Pins 9and 10 of the IC) produce colordrive signals which are matrixed inthe 6ML8 external color differenceamplifier tube, V91.
4.5MHz Amplifier and SoundDemodulator Circuits
A new sound IC (IC91) is usedin this chassis. It functions as thelimiting IF amplifier, the quadraturedetector and the audio preamplifierand driver sections. This IC con-tains 22 transistors, 7 diodes, a ze-ner diode and 21 diffused resistors.This 14 lead dual -in -line plasticpackage is plug-in mounted on thechroma panel.
Conventional type circuits areemployed for sound take -off fromthe IF and detector panel, Fig. 5.The sound take -off diode detector(D1) develops the 4.5MHz soundIF signal by mixing the video andsound carrier signals, and then ap-plying them to the sound take -offtransformer (L93). This transform-er couples the sound IF to IC Pin 4,which is the limiting IF amplifiersection of the IC. Other circuits ex-ternal to the sound IC-but associ-ated with the 4.5MHz amplifier, de-modulator and audio output ampli-fier-include the following: A quad -
A top view of the transformer -powered hybrid 22LT45 color -TV chassis,sistors, 3 integrated circuits and 1 tubes-excluding the 3icture tube.
-ft
which employs 15 trail-
IC91 SOUND INTEGRATED CIRCUIT
1C92 COLOR INTEGRATED CIRCUITThe chassis employs a completely new chroma and sound panel with two IC's mounted in plug-in
sockets. One is used as a 4.5MHz amplifier/sound demodulator and the other is used as a chroma3.58MHz oscillator/reactance/demodulator.
rature coil and tuned circuit con-nected between Pins 11 and 13, thevolume control circuitry connectedto Pins 2 and 9; and the audio out-put connected to Pin 10 of the IC.Bypass capacitors, used for decou-pling, are connected to Pins 1, 5, 6
and 11. The 20v power source is ap-plied to Pin 14, and the ground isconnected to Pin 7.
The limiting IF amplifier, which iscontained in the IC, consists of threedifferential pairs of transistors and
continued on page 66
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER J 43
Which Tape System?When your customers are thinking of buying a tape
music system, they may choose among three
incompatible tape formats-open reel, cartridge
and cassette
Five years ago, less than fourpercent of all recorded music sold inthe United States was on tape; thebalance, of course, was on records.In 1971, tape's share was a hefty33 percent and further gains are ex-pected this year, according to Am-pex Corp., a leading producer oftape and recording equipment.
The principal reason for thisboom is the emergence of conve-nient and compact cartridge andcassette tape recorders,some circles the popularity of theopen reel tape format is still in-creasing. The following commentsare designed to help you more in-telligently assist your customers asthey decide to select one of thesethree systems to fit their particularneeds.
Open Reel
The oldest form of tape music isopen reel, or reel-to-reel, which wasthe only available format until themid -1960's when cartridge systemsbegan to appear. It appealed to crit-ical listeners because of its highquality sound reproduction. How-ever, because of the relative com-plexity of threading tape on reelsand the smaller supply of recordedmusic available on tape reels, theopen reel recorder has not achievedmass acceptance for music play-back. It remains a favorite tool ofthe serious music lover, high-fidelityenthusiast or recording hobbyist.
Most of the open reel recorderssold today are called "decks," i.e.,recording and playing mechanismswithout amplifiers and speakers.
Decks may be joined with high-fidelity systems or components.Good to excellent quality decksrange in price from $200 to $700.Complete systems, including a tapedeck, receiver ( amplifier/tunercombination) and speakers mayrange from $600 to several thou-sand dollars, depending on how de-manding your customer is.
An open reel deck combined withthe other system elements is inmany respects the finest home musicsource there is. For long selectionslike operas, the long playing timeof open reel tapes is a distinct ad-vantage. The sound quality of a re-corded tape is generally the equalof the finest discs when played onequipment of comparable quality;while after a number of playings,tape may be noticeably better, be-cause of record wear.
If used solely for playing backprofessional recordings, the openreel deck has some disadvantagescompared with the record player. Agood quality recorder deck costsmore than a good quality recordchanger. Tape threading still seemsdifficult to many people comparedwith starting a record. With tape, itis less convenient to play a specificpart of an album since the tapemust be advanced or rewound to adesired selection with the aid of atape footage counter. With a phono-graph, of course, the stylus issimply picked up and placed on thedesired spot.
Open reel recordings are muchless readily available than records.In fact, as retailers stock increasing
) OPEN REEL
G1RTRIDGE
G1SETTE0'0numbers of cartridge and cassetterecordings, inventories of open reelselections have actually declined.
Eight -Track Cartridge
More recorded tape music is soldin the eight -track cartridge formatthan any other. The eight -track car-tridge-a plastic box about the sizeof a paperback book containing anendless loop of tape-should not beconfused with the four -track car-tridge, an earlier format which haslargely disappeared from the mar-ket.
Since introduced by Lear Jet inthe mid -1960's, eight -track car-tridge sales have grown phenome-nally. Primarily for use in auto stereosystems, the cartridge has recentlymade headway in the home market.In 1971, more than half the eight-track units sold were auto systems.
A major advantage of the eight -track cartridge format is operatingconvenience. The cartridge is mere-ly inserted in the player and beginsto play. It plays a complete albumover and over again with only briefinterruptions while it switches auto-matically from one pair of tracks tothe next. Three such interruptionsoccur on each album -length tape.Another advantage is cost. Eight -track auto systems range from $50to $100. Home decks start at $100.Quality systems range from $150 to$300.
There are disadvantages to thecartridge format. Sound reproduc-tion cannot approach that of openreel or good quality phonographs,although the highest sound quality
44 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
is not to be expected in moderatelypriced units and automobile players.Because the endless loop design in-volves constant tape -against -tapemovement, eight -track tapes arelubricated to assure continuedsmooth operation. After many play-ings, however, the lubrication maybegin to wear, and occasionally thetape will jam within the cartridge.
Another disadvantage is the lackof a rapid rewind capability com-mon with open reel and cassettedecks. Rewinding permits you to re-peat a specific selection or return toa certain position on the tape for re-cording. Most eight -track units of-fer a push-button advance whichpermits movement from one pair oftracks to the next and fast forwardcapability. But the absence of re-wind capability makes it moreawkward to produce recordings orlocate individual selections withcartridge equipment than with theother formats.
CassetteCassette tape recorders, devel-
oped by Philips of Holland, werefirst available in monaural battery -operated portable models for voicerecording. Stereo units for home re-cording and music playback wereintroduced in 1966. Ampex was thefirst U.S. company to offer stereocassette systems in 1967. Cassetteauto stereo systems have been avail-able for several years as add-on ac-cessories. Manual cassette recordershave all but replaced open -reel re-corders in the under $100 range,and stereo cassette systems areachieving widespread acceptance inthe home. Cassette auto systemshave made only modest inroads inthe auto stereo market, where theeight -track cartridge remains domi-nant.
Cassettes, like cartridges, are nomatch for open reel tape or phono-graphs in terms of sound reproduc-tion quality. There is little measure -able difference in sound qualitybetween the cassette and cartridge,but new developments in tape andequipment can significantly enhancethe quality of cassette sound for anadditional cost.
One new development is the Dol-by noise suppression system, whichmodifies the record and playback
As you know, recorded music is available in three major tape formats: open reel, eight -track car-tridge and cassette. Open reel (left) is the familiar reel of tape and is the choice for high-fidelityand classical music because of its 'Ugh quality and long playing time. Eight -track cartridge (center)contains a single endless loop of tape in a plastic case z nd is most commonly used in automobileplayers. The cassette (right) holds two tiny reels of tape in a plastic case and is one-fourth the
size of the cartridge. According to Ampex, it is the most convenient format because of its size,
ease of operation and portability.
signal electronically to significantlyreduce the amount of hiss or noiseheard when playing the tape. TheDolby technique is one of three orfour noise suppression systems, butby far the most widely accepted.Dolby systems are incorporated insome higher priced recorder/playersand may be purchased as accesso-ries for existing units.
Other improvements, involvingthe tape itself, have been developedfor those who enjoy recording ontheir cassette systems-extendedfrequency tapes and chromium di-oxide tapes, available at extra cost,are specially formulated to permitfaithful reproduction of the fullrange of sound.
Compactness, versatility and econ-omy are important virtues of thestereo cassette system. The cassetteitself is about one-fourth the size ofa cartridge, and the recorder orplayer also can be more compact. Acassette consists of two tiny reels oftape encased in a plastic box insteadof the endless loop of tape in a car-tridge. Cassette tape does not haveto be lubricated. Like open reel, butunlike cartridges, cassette tapes can
be reversed at high speed to locateindividual selections.
Automobile cassette stereo sys-tems are making some headway incompetition with the eight -track car-tridge because of smaller size. Aglove compartment will hold threeto four times as many cassettes ascartridges. Newer cassette autostereo systems have an automatic re-verse system so that both sides of analbum may be played without hand-ling, and the cassette can be cued torepeat itself.
Stereo cassette equipment rangesin price from $100 for a simple"deck" to $500 for a top of the linesystem. Auto players sell from $60to $130.
Four -Channel Sound
An exciting new development inrecorded music is four -channel orquadraphonic sound, which broad-ens the musical experience by break-ing the performance into four partsrather than the two used in stereo.In the best of cases, listening toquadraphonic recordings is like be-ing surrounded by an orchestra. So
continued on page 68
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 45
Temporary Fixesfor Etched
Circuit Modules
Many of the newer solid-state circuit modules use verycritical values to achieve correct operation. Thetrend is toward using a complete replacement unit orsubassembly whenever a value becomes so far off as toprevent the correct operation of the whole module. Butsometimes such a module may not be readily enough availableto get the consumer electronic product back into servicewhen wanted.
by Norman Crowhurst
When replacement modules are not readily avail-able, it may be desirable to use some sort of "make-shift" technique to repair the original defective module.Although in most instances these modules become de-fective because of a faulty semiconductor, or maybeeven a faulty capacitor, there are cases when the troubleresults from a slight change in resistor values as a re-sult of heat. This article is primarily concerned with thislatter component.
Voltage -divider circuits are probably the most criticalwhen it comes to resistance changes, since they can yielda voltage sufficiently different from the design value,thus preventing proper circuit operation. Suppose, forexample, that two resistors across a 15v supply (Fig. 1)have nominal values of 24011 and 465011 (each with a1 percent tolerance). This means that in the absence ofany current drawn from the voltage -divider junction, thevoltage at this junction should be: 15v X 24011/ (24011+ 465052) = 15v x 24011/489011 -.-_-. 0.7362v or 0.74v.
By substituting resistance values, we can see that thegreatest junction voltage will occur when the value ofthe 24011 resistor is up 1 percent while the value of the465011 resistor is down 1 percent-the resulting junc-tion voltage being 0.7503v or 0.75v. Similar calcula-tions indicate that the smallest junction voltage will oc-cur when the value of the 24011 resistor is down 1 per-cent while the value of the 465011 resistor is up 1 per-cent-the resulting junction voltage being 0.7223vor 0.72v. This means that under the first condition wewould have a voltage error that is +1.92 percent or+2.0 percent; and under the second condition we wouldhave a voltage error that is -1.89 percent or -2.0percent. Thus, in this example, the percentage of voltageerror is double the percentage of component value error.
Now suppose that during normal operation a currentof up to 100tta is drawn from this voltage-divider junc-tion. This current source resistance is the combinedparallel resistance of 24011 and 465011, which is about23052 (± 1 percent). So with this load current the volt-age at the voltage -divider junction will drop 23mv or0.023v. And thus the voltage with this load current willdrop from 0.736v to 0.714v-and may vary from0.698v to 0.728v within tolerance variation.
[I must admit that I was personally disturbed by theinformation in this preceding paragraph and wrote Nor-man the following concerning the matter: Assuming thatthe B+ and B- supplies are both ac coupled to ground,then your statement concerning the parallel effect of the
24011 and 465011 resistors would be correct-but onlyfor ac signals. Unfortunately, this portion of the articlerefers to dc biasing, and the entire base current of atransistor must flow through the 465051 resistor. Onthat basis, the resulting voltage is 0.3v, rather than the0.714v stated in your article.
Norman responded immediately and advised me thatI was actually the one in error. Still puzzled, I went intoour lab to see who was actually correct, connecting tworesistors and a potentiometer as shown in the diagram
Component arrangement for demonstating the parallel load theorypresented by the author. The same effect would have been observedif a larger maximum -value potentiometer was instead placed in paral-lel with the larger value resistor.
above. Without the potentiometer a voltage drop of0.721v was measured across the smaller resistor.With the potentiometer adjusted so that the multimetermeasured a 100pa current, this voltage was reduced to0.698v-the 0.023v change noted by the author. It isamazing how easily one can forget some of the basicdc theory concerning merely a voltage source and someresistors! Ed.]
So much for calculating what voltages should be undernormal operation. Most schematics will give at leastsome indication of what the voltage ought to be. Insome circuit you may note that the voltage, which itsschematic indicates should change between 0.71v and0.74v, shows an actual change between 0.60v and 0.63v-way too low.
You may then suspect that one of the resistors haschanged value, and upon checking find that the onerated as 465011 is in fact 470011, while the one ratedas 24011 is in fact 20451.
The larger one is just at its 1 percent tolerance limit,
46 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
but the one with the 24011 value has gone low by 3652, a15 percent change. This error is great enough to eas-ily designate the 1 percent resistor faulty. The bestthing would be to replace the whole unit containingthis part. But if it is not immediately available, you maywant to effect a temporary remedy.
Arithmetically, the obvious solution would be to in-sert a 3611 resistor in series with the 20411 resistor, sothat the total value in this portion of the circuit is whatit is supposed to be. But this may not be practical. In-serting a resistor in series means that one end of theoriginal resistor must be removed from the circuit boardand another inserted in series with it (Fig. 2). The as-sembly layout may not physically provide room to getthese components into the space available.
A change probably involving less space would be toparallel the 465011 resistor with a value that will bringthe voltage back to what it should be (Fig. 3). How-ever, calculating the value required to do this is notquite so simple. But there are several ways to go.
Possibly the most foolproof technique involves theuse of voltage and current calculations. Assume youdecide to make the open -circuit voltage correct at 0.74v.With the 2041/ actual resistance, the current passed
0.74vwill be: =
0.204K3.63ma. The pair of resistors in
parallel-across 15v - 0.74v = 14.26v-must pass thesame 3.63ma, requiring that the parallel combination
14.26vhave a value of =
3.63ma3.930K.
Applying the parallel resistance formula to obtain thedesired total value, when one resistor is measured at
470011, requires a value of 393011 x47001/
(470011 - 393011)
= 393011 x470052-
28,00011. If you select a 27K770D,
resistor that is a little high in its tolerance, it should dothe trick.
That is one possibility. On occasions a resistor will gohigh in value, but more often, with composition or film -type resistors, they will go low --due to absorption ofhumidity while their temperature is elevated, whichmay be caused by either internal or external heat gen-eration.
Suppose now that the 465011 resistor is the one thathas gone low in value, to about 420011-resulting in avoltage drop of 0.81v without the 100pa load and 0.79vwith the 100p,a load.
Again the proper correction would be to raise the420011 value to its 465011 normal value by insertingabout 45052 in series with it (Fig. 4). But this may bedifficult due to a problem of obtaining adequate space,and parallel connections may be simpler to install.
Figuring that 15v - 0.74v = 14.26v should bedropped across the 420011 actual resistance, this means
14.26vthat it must pass
4.2K= 3.4ma. A resistor that must
produce the nominal 0.74v when 3.4ma flows through0.74v
it will need a value of =0.0034a
2181/ The actual
24051, 465051
Ov O.74v 15v
;-'f1111F-.1
Fig. 1-Suppose that tworesistors across a 15v supplyhave nominal values of 240'.2and 465012.
20451 actual
4650,51,Fig. 2-Inserting a resistorin series means that oneend of the originalresistor must be removed
from the circuit board and anoth!r inserted in series with it.
20411, 27K Fig. 3-A change probably involvingi ' _ less space would he to parallel
4111135:'-_,, the 4650".2 resistor with a value that
4700S2, - will bring the voltage back to whatit should be.
4200 SLactual
24011,450,0,
1 1 1 11Fig. 4-One proper methodof correction would be toraise the 420E' value to
its 4650'2 normal value ty inser:ing about 45E' in series with it.
2400.11.411111.
24051,
420011 Fig. 5-The actual value of theresistor in this circuit is 240'.2, soa parallel value of 240'2 is required.
R1
4650,51,
O.74v
Fig. 6-A critical balance of resistance values can sometimes be foundaround a transistor stage biased for the semiconductor's linear modeof operation.
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 47
value of the resistor in the circuit is 24011, so the paral-lel218flvalue required is 24011 x = 24011(24011 - 21811)21811
= 2,40052, almost exactly (Fig. 5).2211[Although we feel that it is very important to have an
understanding of the calculations described thus far inthe article so that selecting shunt resistors is not a mat-ter of guesswork, a less mathematical technique mayprove faster. Instead, take a potentiometer having amaximum value approximately 10 times that of the re-sistor that has not changed and, as a safety feature, con-nect it in series with a resistor having a value approxi-mately three times that of the resistor that has notchanged --as in the diagram shown at the right. Con-nect the resulting circuit in a parallel with the un-changed, good resistor and adjust the potentiometer
to compensate for the excesscurrent flowing through the re-sistor that has decreased in value.When properly adjusted, the volt-age -divider junction voltage willbe back to normal. Then measurethe resistance of the shunting cir-cuit and substitute a resistor ofnear equal value. Ed.]
There are also other possibilitiesin this circuit that should be con-sidered: what if one or the otherresistor has gone high in value,rather than low. Usually thevalue will go very high, due to aphysical fracture in the material.Under these conditions a replace-ment resistor, having as near theoriginal value as possible, shouldbe shunted across the bad one ifit can't be readily removed.
But suppose the value has gone just a little too high-just too far to remain operative. Suppose the 24011 re-sistor has risen to 34011-indicated either by a rise inthe voltage measured, by measuring the resistance withthe power OFF, or by both checks. Now, we will need a
24011resistor that has a value of 3401/ x (34011 - 24011)
Component arrange-ment for experimentallydetermining the requiredparallel resistance.
= 34011 x 2401/- 81652, for which an 82011 resistor
1001/will probably serve as a temporary fix.
Now suppose that the 465011 resistor has risen invalue to 560011. To bring it back to 46501/ will require
011= 560011 x
46 465011a 560011 x(56001/
5
- 465011) 9501/= 27,40051, for which a 27K resistor comes close.
Far less likely than one resistor having changed value isthe possibility that both of them might have. Further-more, if both of these resistors have changed value,then there is a greater probability that other resistors inthe circuit-as well as these voltage dividers-may havealso changed value, with the result that correcting thevoltage would still not make the circuit function correct-ly, even temporarily.
So if both resistors have changed value beyond theirtolerances, the best decision is to wait for a replacementand not try to fix the unit as it is.
A similarly critical balance of resistance values can some-times be found around a transistor stage biased for thesemiconductor's linear mode of operation (Fig. 6).Here the resistors across the supply (R1 and R2) pro-vide a base bias voltage of the order just described. Andthe collector and emitter resistors (R3 and R4), com-bined with this voltage, determine the operating con-dition for the transistor.
The emitter voltage "follows" the base voltage, whilethe emitter resistor determines the collector current.Suppose the emitter voltage is 0.7v and the resistor has
0.7va value of 3911-this fixes the emitter current at0.039K
= 18ma. The collector current will be almost identical,and the collector voltage will then be determined bythe collector resistor.
If the collector resistor has a value of 62011, a cur-rent of 18ma will result in a voltage drop of 11.2v,leaving 3.8v between the collector and ground, or 3.1vbetween the collector and the emitter-adequate forcorrect transistor operation. But if the 391/ resistorgoes low in value, the collector current will rise, reduc-ing the voltage available across the transistor-maybesaturating it for that particular collector resistor value.
Or if the collector resistor rises in value, the voltageacross the transistor will again fall as that across thecollector resistor rises, causing possible saturation. Ei-ther way, the error in resistor value will show up duringmeasurement-the collector voltage measuring the sameas the emitter voltage (0v across the transistor). Thepoint to realize is that this does not necessarily indicatethat the transistor has short circuited-although this isanother possible cause for this incorrect voltage indica-tion.
When encountering this kind of wrong indication, thefirst thing to do is to check the transistor with an in -circuit tester (and the power OFF, since its own circuitsaturates it with the power oN). Then, if the transistoris okay, check circuit values and carefully calculate whatvoltage these values should produce at the collector-as has been done in the article.
If the values combine to produce an unworkablevalue, either replace the defective module, or modifyone of the values (probably the collector resistor in thiscase) to make the voltage workable.
Note that it is generally normal for there to be a lowtransistor collector -to -emitter voltage, provided it is notlow enough to cause saturation. Making the workingcollector voltage low keeps transistor power dissipationdown, and allows a bigger current swing than would beavailable from the same transistor working with a highercollector voltage.
If the values are not far enough "off" to saturate asa steady condition, they may still cause the transistorto saturate during part of the signal waveform, causingclipping. Again, the voltages measured will indicate this.Note whether or not the collector voltage swings up alittle in the presence of a signal, as it will if this stage is
continued on page 58
48 ! ELECTRONIC TECHNICIAN/ DEALER, JUNE 1972
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50 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
There are still, of course, somewidely differing opinions amongdealers when it comes to the ques-tion of whether or not to start sell-ing service contracts. However, re-gardless of what position you takeon the matter, there are some factswith which you should be familiar.
Service contracts apparently arehere to stay, and they are definitelybig business. Just how big, nobodyknows for sure. One thing that iscertain, though, is that this form ofservice sales promotion continues tocapture a steadily increasing shareof the paid service market each year.While there are no total industry fig-ures available, it is estimated thatthe combined service contract salesof the three industry leaders (Mont-gomery Ward, Sears and RCA Ser-vice Co.) are well in excess of $200million, annually. Obviously, theAmerican public believes in servicecontracts. One thing to rememberis that each increase in service con-tract sales produces a correspondingdecrease in the paid service marketavailable to the dealer who does notsell them.
The advantages of a successfulcontract sales program for the indi-vidual dealer have been well dem-onstrated. To begin with, selling ser-vice contracts means that the dealerhas opened the door to a huge andgrowing market which otherwisewould not be available to him. This,in turn, creates potential increases inincome and profits. Further, the saleof renewal contracts to regular cus-tomers provides an increasing basefor future income.
Service Contracts areBig Business
by William Joseph
Did you know that TV service contracts have been
around for almost 25 years? That's pretty good
longevity for an invention that some service dealers
have scorned as a temporary gimmick.
In addition, contract sales in vol-ume tend to minimize the age-oldproblem of severely fluctuating workloads. Customers who are on a pay-as-you-go basis often tend to post-pone repairs during the vacationmonths or when the householdbudget is stretched. On the otherhand, TV viewers who buy servicecontracts will usually call for servicewhenever the need arises. As a re-sult, the dealer with a number ofservice contract customers finds iteasier to predict service volume andto budget manpower requirements.
Of course, there are disadvan-tages to be recognized and dealtwith; some of which are of consid-erable significance. Probably themost important of these is the strictaccounting discipline required aspart of any contract sales program.When you sell a service contract to-day-and accept the money today-you have created a deferred obliga-tion that must be fulfilled as muchas a year or two later. The financialrisks of such a situation are evident.If your handling of finances is slop-py, you will be courting disaster. Inrecognition of this, Uncle Sam hasimposed certain accounting regula-tions for deferred obligation situa-tions, and they apply directly to ser-vice contract sales. In the finalanalysis, though, no one but you andyour accountant can protect youfrom poor financial management.
Of no less importance is the prob-lem of pricing. The service contractthat you sell today, at today's prices,will be fulfilled at a future time forwhich your costs are presently un-
known. Obviously, then, the pricingthat you apply to the contracts youoffer must be arrived at with greatcare.
It is quite possible to overcomethese problems, as demonstrated bythe many small dealers who havebeen in the service contract businessfor 10 years and more. The riskscannot be taken lightly, however.Careless handling of contract in-come and unrealistic pricing of con-tracts have led some firms intobankruptcy.
Despite the risks involved, thepotential rewards of a successful ser-vice contract program are luringmore and more independent servicedealers into experimental efforts.There are also those who feel thatgetting started now in the sale ofcontracts will be an advantage ifand when the manufacturers startextending their warranties for a yearor longer.
Speaking before the NationalElectronic Associations' businessmanagement school last summer,Jerry Canter discussed this problem.Mr. Canter, who is president of Uni-versal Television in Los Angeles,feels that original warranties of atleast one full year, and possibly twoyears, are inevitable. Smaller servicecompanies that get started with ser-vice contract programs now, he says,will be prepared to do business withcustomers who want complete cov-erage for the second, third, or fourthyears and beyond.
For those who want to get started,the biggest problem is just that-getting started. Obviously, the first
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 51
contract cannot be sold until aschedule of pricing is determined.Ideally, pricing of service contractsis done on the basis of carefulstudies of the costs involved in ful-filling the contracts. In fact, aftersufficient records and experience areavailable, this is the only acceptablemethod for determining how muchto charge. There is no reason, how-ever, that the dealer just gettingstarted with contracts cannot capi-talize on the experience of the big-ger companies to establish his basicprices.
The large companies have hadyears to study their fulfillment costs,and they have hundreds of thou-sands of records to analyze. Pre-sumably, the independent TV ser-vice dealer will not have costs higherthan the big companies ----more like-ly, his costs will be lower. Thus, theprices charged by the big companiesin a given area should provide a safestarting point for the independentdealer. Fig. 1 shows the contractselling prices of several firms in onelarge metropolitan area. You shouldhave no trouble obtaining the pricesbeing used in your area.
Once you begin to sell contracts,a precise analysis of your fulfill-ments costs is an absolute necessity.Only by determining your exactcosts can you expect to arrive at sell-ing prices that are optimum for yourorganization. Fig. 2 is a suggestedform that can easily be kept for eachcontract customer to determine ful-fillment costs.
Selling prices for both parts andlabor can be entered on the formeach time a service call is made un-der the contract. Thus, at the ex-piration of the contract, you cancompare how much you would havereceived on a pay-as-you-go basis,with what you charged for the con-tract.
As your contract sales increase,you will be able to average out yourfigures over a number of contracts;thus, your prices will begin to reflectyour own experience. As an exam-ple, let us assume that your study of50 expired contracts covering 3 -year -old B/W -TV sets shows thatpay-as-you-go income would havebeen $2,050. Dividing that figure by50 gives us $41 per contract.
Before you can price your con-
tract, though, you still need onemore figure. There are direct ex-penses that will be involved in yourcontract sales program. Such thingsas printing costs for the certificatesand form letters, postage and sales
commissions all must be taken intoconsideration. To complete our ex-ample, we will assume that the totalof these direct expenses divided bythe number of contracts sold duringthe period in question comes to
SERVICE CONTRACT PRICES IN EFFECTIN ONE MAJOR CITY
B/W -TV SETHOME SERVICE RCA G.E. SEARS
1st year of ownership $ 36.95 $ 30.95 $29.952nd year of ownership $ 69.95 $ 56.95 $49.953rd year of ownership $ 69.95 $ 62.95 $54.95
COLOR -TV SETHOME SERVICE
1st year of ownership $ 46.95 $ 45.95 $49.952nd year of ownership $103.50 $100.95 $84.953rd year of ownership $103.50 $127.95 $94.95
COLOR -TV SETSHOP SERVICE
1st year of ownership $ 30.95 $ 29.95* $29.952nd year of ownership $ 51.95 $ 55.95* $59.953rd year of ownership $ 51.95 $ 71.95* $69.95
*18 -in. screen
Fig. 1
NAME
SERVICE CONTRACT EXPENSE RECORD
ADDRESS
BRAN,
Ar,f
TECHNICIAN DATE COMPLAINTSERVICE
TIMEPARTS LABORUSED CHARGE RE MARKS
Fig. 2
52 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
$8.60. Adding that to the fulfillmentcost described previously brings thetotal to $49.60. This would suggest$49.95 as a logical selling price foryour third year TV -set contract.
There are, of course, a number ofother ways to approach the job ofpricing contracts. The bigger com-panies, with the aid of thousands ofrecords and computer analysis oftenuse exact cost figures in their partsand labor statistics. This providesthem with a cost figure to which theycan add their desired markup. Also,because they deal with great quan-tities of the same make and model,they are able to gather precise his-tory -of -failure records. Realistically,however, the small dealer must stickto a simple system such as the onejust described.
Before entering into a contractsales program, it would be well foryou to understand the necessity ofvolume sales. Since the pricing ofcontracts is based on the premise ofaverage costs, a reasonable numberof sales are required to make theaverages valid. A half-hearted salesprogram exposes you to the risk thatyour only contract customers will bethose who are easy to sell. Inevita-bly, the customers who are the mostanxious to buy contracts will bethose who have a history of exces-sive service requirements. An ag-gressive and professional sales pro-gram will minimize this risk by pro-viding you with a broad base of cus-tomers.
Basically, there are three sourcesof service contract sales for the inde-pendent service dealer: sales bytechnicians, direct mail, and tele-phone solicitation. A truly success-ful effort will require attention toall three.
The easiest method for enteringthe contract sales business is by sell-ing through the electronic techni-cians themselves. Most customersview the electronic technician as anexpert, and his recommendationswill usually carry considerableweight. Since these technicians willeventually come into contact withall of your current customers, theywill be a valuable source of sales.
Usually, all that is needed to getstarted is a reasonable amount oftraining for your men so that theywill understand the advantages to
both the customers and the com-pany, plus an incentive to keep theminterested. Most dealers prefer topay technicians on a commission ba-sis for contract sales, with the ratevarying between 5 percent and 20percent.
For most dealers, sales by elec-tronic technicians soon prove to beinadequate to provide the volumerequired to make the program work-able. For this reason, it is suggestedthat direct mail and telephone solici-tation be incorporated in any servicecontract program right from the be-ginning.
While both direct mail and tele-phone selling are complex subjectsbeyond the scope of this article,there are a few important principlesthat can be outlined.
There is general agreement thatdirect mail and telephone sellingshould be tied together in a programthat will permit them to complementeach other. One popular systemcalls for a direct mail piece followedin a specific number of days by atelephone solicitation to customerswho do not respond to the mail ad.Theoretically, at least, the mailpiece "softens up" the customer andpaves the way for the telephone so-licitor.
This system is particularly valu-able for the sale of renewal con-tracts. Once a program for sellingcontracts has been running success-fully for a year, renewals become afactor. One point on which all deal-ers selling contracts seem to agree isthe importance of taking advantageof the great income potential andprofitability of renewal sales to regu-lar customers. As a result, a pro-gram like the one-two punch just de-scribed can be found in most serviceshops selling contracts.
Direct mail is an exacting field,and the dealer expecting to makeuse of it should attempt to learn asmuch as he can about it. Profession-al help, wherever it is practical, willusually be a good investment. Prob-ably the most important single pointto be remembered when preparingdirect mail is the effect that physicalappearance will have on results. Theprofessionals have long sincelearned that compromises in thequality of reproduction and the ma-terials used in direct mail will nearly
always have serious negative effects.It does not take much imaginationto figure out why-especially in thecase of a service contract promo-tion. If your mailing is amateurish,cheap -looking or careless, you can-not expect your customer to haveconfidence in your ability and will-ingness to provide professional ser-vice.
Most experienced dealers wouldagree with Jack Badaracco of theRCA Service Co. who said, "Youcan sell three times as many con-tracts with a direct mail and tele-phone program as you can with adirect mail program alone." There isno doubt about it: telephone sellingis an essential part of a contractsales program.
Telephone selling, too, is a highlyspecialized field. Not everyone issuited to this type of work, so youmust make an effort to find the rightman or woman for the job. Some-times it is necessary to try severalbefore the right person is found.
Once you are set up, you willhave to experiment with the all-im-portant matter of timing. Generallyspeaking, the calls should be madeabout a week or 10 days after themailing of your printed materials.The experience of several dealers in-terviewed would seem to indicatethat the evening hours (before 9:00p.m.) are better than daytime hoursfor selling TV contracts. Perhapsthis is because both husband andwife are home at that time. Also,there would appear to be a slightedge in favor of the male telephonesalesman, although there are manydealers who use only females in thiswork.
Do not forget that the telephonecompany in most areas will gladlyprovide free training for telephonesales personnel. If you decide to en-ter a contract sales program, youshould not overlook this importantsource of expert help.
Selling service contracts is not adecision to be taken lightly. A suc-cessful program demands carefulpreparation and aggressive atten-tion. However, the service dealerwho chooses to bypass the service -contract business is excluding him-self from an increasingly importantsegment of the television servicemarket.
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 53
Protecting Business Records
by Ernest Fair
The protection of an electronic technician's or
dealer's business records is of greater importance
than one usually realizes-unless you have
already been caught without them.
Certain records are vital for thecollection of insurance claims whendisaster hits, and others are a mustfor tax purposes. Some of the basictypes of records that must be pro-tected include the following:
Records covering every singleitem protected by insuranceof any kind
The establishment of a claim aftera fire or other disaster may well de-pend upon these records. A goodrule is that if insurance coverage isinvolved, the records to substantiateclaims must be present after the loss.
These include a record of pur-chases, date and source, for allequipment in order to collect thetrue salvage value of each unit. Allsupplies and other inventory shouldbe kept up to date to show what wason hand at the time the disaster tookplace. No insurance claim of anykind will be settled for any morethan the owner can prove was pres-ent at the time of the disaster.
Basic records showing theperformance of the business
Business performance recordsmay be necessary for a number ofreasons, but primarily for securingfinancial assistance in the future.Few such assistance programs canproceed without extensive back-ground records covering the busi-ness. These records may even benecessary to secure a loan neededto get started again after a disaster.
Where business interruption in-surance is carried, such records area must if the full claim is to be ob-tained for the total period of timerequired for the business to get backto its earning capability.
Depreciation records of all kindsIt is necessary to substantiate data
on capital assets for many uses. Rec-ords showing date of purchase, cost,estimated useful life, estimated sal-vage value and depreciation takenare important.
They are of course very necessaryshould an income tax return bechallenged for any period covered inthe past. They also have value insettling insurance claims and will beneeded should the business ever besold or merged.
Salary and wage records coveringevery individual on the staff fromthe shop owner down to thesmallest -salaried individual
Complete payroll records are nec-essary for many elements of contin-ued business operation after a dis-aster. They may be needed in set-tling disputes over wages and terms,for use in negotiating new wage ar-rangements and for settling any pos-sible future disagreement with gov-ernment agencies concerned aboutsuch records in tax and regulatorymatters.
Tax withholding statementsThe law states that tax withhold-
ing statements must be kept by ev-ery business, and even a small shophiring but one man is no exception.This includes all records coveringincome taxes withheld from wages,special government levies, pensionfund payments through a privatebusiness arrangement and unem-ployment data.
All such records should be keptsafe after the legal reasons for theirretention have expired, since theyhave additional value in a number
of other areas concerned with fu-ture business operations-such asloan solicitation forms to provebusiness operation costs.
Unusual business expense recordsToo frequently records of unusual
business expenses are handled care-lessly after the current year's book-keeping has been tabulated. Thiscan create a costly situation if thedeductions involved in such expenserecords are challenged in the futureand no details are available to sub-stantiate them.
Every business expense recordshould be retained for a reasonableperiod of time, if for nothing morethan to prove that the account con-cerned has been paid. Claims of thisnature can come back as much as ayear after actual payment.
Records of business lossesAny records concerning business
losses are, of course, necessary withrespect to tax matters. But they canalso have value concerning futureinsurance claim matters. Too fre-quently only summary records ofthis nature are kept and all supple-mental items pertaining to the basictotal information are discarded ornot given adequate protection againstloss. Even the most supplementaldata can have great value at a timewhen such basic total records mustbe proven.
Reports and drawingsIt would be a mistake to down-
grade reports and drawings with re-spect to security and protection.There are many ways in which anyor all of them can have serious im-pact on the business in the future.
They are most frequently re-quired to provide evidence in a fu-ture lawsuit, and no owner of abusiness can ever be assured that hewill not have one of these. Theymay also be needed to substantiatethe position of the business during amerger, sale of the business, settle-ment of an estate, etc.
Historical dataA great deal of historical data has
value in determining the course offuture business. If such informationis not present when needed, its loss
continued on page 65
54 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
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56 ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
Triplett's Model 603 FET VOM. For more de-tails, circle 900 on the Reader Service Card.
If you share any of my bad hab-its, then you have also occasionallydiscovered the next morning thatyou had forgotten to turn all yourinstruments OFF the night before.Our front cover shows such a situa-tion-a meter (the one described inthis report) in operation during themiddle of the night-long aftereveryone had gone home.
Although such forgetfulness maybe hard on the batteries of somemultimeters, this is not the case withTriplett's Model 603 FET VOM,since it requires only 10kca of bat-tery current when in use. In fact, itmay be left oN indefinitely withoutimpairing its performance-the bat-tery life for the carbon batteries ap-proaching that of shelf life.
Additional features include auto-matic polarity (when desired)where you are interested in takingvoltage and current measurementsbut are not concerned with the po-larity. (The instrument can also beoperated in the conventional posi-tive or negative polarity mode.)And the low -power ohms scales per-mit in -circuit resistance and con-tinuity measurements without bias-ing or destroying sensitive diodes,IC's and transistors.
Other manufacturer specificationsinclude those given at the right:
TEST INSTRUMENT REPORT
Triplett's Model 603 FET VOMby Phillip Dahlen
May be left ON indefinitely, drawing only
10pa from batteries
DC VoltsRanges: 0-0.3-1-3-10-30-100-300-1000v.Accuracy: ±3% of full scale, all ranges.Input resistance, all ranges: 11.12M (1.12M resistor in probe tip).Auto Polarity: Pointer indicates up scale for either polarity.Polarity Determination: Push button + or -.
AC VoltsRanges: 0-0.3-1-3-10-30-100-300-1000v ac.Accuracy: ±3% of full scale, all ranges.Input impedance, all ranges: 10M.Frequency range: 20Hz to 10kHz-all ranges except 300v and 1000v.Detection: Average calibrated in rms.
Ohms-Low PowerRanges: 0 -1K -10K -100K -1M -10M -1000M.Accuracy: ±3% of dc v arc on all ranges.Open circuit voltage: 70mv.Maximum power applied to device under test: Low range, 123µw. All otherranges, power is correspondingly less. (101.1 center scale on low range.)
Ohms-ConventionalRanges: 0 -1K -10K -100K -1M -10M -1000M.Accuracy: ±3% of dc v arc on all ranges.Open circuit voltage: 1.5vMaximum power applied to device under test: low range, 57mw. All other ranges,power is correspondingly less. ( I Oil center scale on low range.)
AC and DC MilliamperesRanges: 0-1-10-100-1000ma with 316mv voltage drop.Accuracy: ±4% of full scale, all ranges.Auto Polarity: Pointer indicates up scale for either polarity.Polarity Determination: Push button + or -.
DecibelsRanges: -30dB to +62dB.Accuracy: ±3% of full scale, all ranges.Scale: lower arc, lettered -20 to +2, 0dB = .776v.
Instrument ConstructionDimensions: 5'/8 in. wide by 61/2 in. high by 3 3/16 in. deep.Weight: Approximately 21/2 lb with batteries.
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 57
ES16X30 Diode, Y104
-Of-so."..,
COLORFAXThe material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.
GENERAL ELECTRICTV Chassis U-I-Dark Vertical Wedge on Left Side of Picture
A dark vertical wedge-shaped area may appear on theupper left side of the picture approximately 2 -in. from thetop and 3 -in. from the left side of the picture. To correctthis problem, replace resistor 8230 with a 4.7K, 1/2w re-sistor. This resistor was changed during production in Oc-tober (Code 5T4N) from 2.7K, 1/2w to 4.7K, 1/2w.
0105VIDEO
AMP
42221005%
R220220
R1290.2K2ro
C129.0027
50VR128
05%
70C207
0205VERT CUT
R228225%
R223225%
T.P.034701.4I(V
1.107 0133220v0
-f-I40V
R1302200BRIGn r pit so
I
72528
R2302.78
R214 "2C5108
+130V itses
9229568
8225470
21V
R224920
0212.22
600V
FROM725?-C214 TERM
I Ovf+ 10V FR(
7254
TV Chassis U-1-Picture Tube Circuit Changes
Circuit changes were made early in production to im-prove voltage regulation on the picture tube grid. Resistor
To T252 Term. 4
C13.1
;411 4 ;5V, RI35
1 111#1"Vr-=w-ispow, 3 6 , 56101, 56102
4.414 .9 igadal":R133 L107
To Test Point IV
To Test Poont IV
U-1 CHASSIS PICTURE TUBE SOCKET
R135 was changed from 4.7K to 10K and a diode Y104was added from the junction of Test Point IV, capacitorC130 and coil L107 to the junction of R135 and the jump-er to Terminal 4 of the high -voltage transformer.
MOVING?Be sure to let us know your new address.Please enclose a complete address labelfrom one of your recent issues.
TEMPORARY FIXES ...continued from page 48
causing that kind of clipping.Also, when you check the transistor be certain to
check its cut-off current. The same symptoms can ap-pear when the transistor becomes "leaky"-conductingmore current at cut-off than it should. Check the mea-sured cut-off current against the rated maximum valuefor the type of transistor used. If it is higher than itshould be, saturation will not be controlled entirely bycircuit values, and the transistor should be replacedwith one for which the leakage current has been foundto be within the proper rating.
[Although the replacement of resistors that havechanged in value as a result of heat may be considereda complete repair job-provided the source of heat hasbeen satisfactorily investigated-as the author has in-dicated in the title of this article, shunting resistors thathave changed value can be considered only a "tempo-rary fix." Only by replacing such resistors, with the useof new resistors or new complete modules, will the re-pair job be final. This is due to the fact that there is noassurance that the defective resistors might not con-tinue to slowly change in value. Ed.J
-----r3C1C'.1
---------. ' *C3S F.'---- . SA, .5c
otfl
014
dA40
0.°
°
Have you madeyour reservations yet?
Some states Already require the licensing of all electronictechnicians and service dealers. If your state doesn't, it soon well!Who's working to protect your interests?
Come get acquainted with the trade associations dedicated to yourbest interests. You don't have to be a member of any association toattend. Learn what can be done to improve your future security andincrease your future income.
There is a business school to help the service dealer. There are seminars to help the electronic technicians. There are even seminars for the editors of association publications.
Come to the convention concerned with improving our profession!
58 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
A better ideafor safety: Buckle up.
Better ideas,van after van.That's why Ford has
led in sales for II straight years.Over the years, only Ford vans havehad so many better ideas that makevans easier to drive, to service, to use:Choice of swinging doors or newgliding sidedoor forcargo han-dling incrampedalleys andbeside loadingdocks. Three separate tracks, at top,bottom and center, give bridge -likesupport for solid, smooth, one -handed operation, tight seal.Shorter outside, easier to park. Com-pared to other makes with similarloadspace, Econoline vans have sig-nificantly less overall length. Thismeans easier parking and bettermaneuverability in city -delivery oper-ations-time saved on every trip.Wider at top for built-ins. Body sidesare more vertical, wider apart at topthan other vans. Built-in units fit bet-ter and leave more aisle. Many mod -
ular units offered allowing you to cus-tomize almost any interior you need.Easy, out -front servicing. Routine
service points are rightat hand under the con-venient outside hood:
radiator, oil level,battery, windshield
washer reservoir,voltage regulator, wiper
motor, brake master cyl-inder and optional power -
steering reservoir.Strong, Twin -I -Beam IndependentFront Suspension-Ford's exclusivedesign smoothsthe going forboth load anda river. Twoforged steel I-beam axles providestrength and durability; wide wheelstance means stability in cross winds.Biggest payload. Husky construction,high capacity axles allow you to haula heavier load than any othe- van.Three series (two lengths). One takes.. for more details circle 112 on Reader Service Card
JUNE
payloads up to 4,285 lbs.-largest inthe industry.Engine clear forward. In Ford's clear -deck design, en-gine is forward-all the way out ofcargo area. Over81/2 -ft. clear floorspace behinddriver's seat...over 10 ft. in theSuperVan. Driverand passengercan easily step from their seats intorear cargo area, exit through side orrear doors.
OLDINTRUDER"
DESIGN
FORD"CLEAR DECK"
DESIGN
FORDECONOLINE
VANSe-o;ci
1972, ELECTRONIC TECHNICIAN/DEALER 59
TECHNICAL DIGESTThe material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.
MAGNAVOX
Tuner/Amplifier Chassis R243/244/245-Distorted or No Audio onOne Channel Only (Early Version)
There have been reported cases of "distorted audio" or"no audio" (usually affecting only one channel) in theearly version of the R243, R244 and R245 chassis. For noapparent reason the fuses open in the output section of theaffected channel. For such symptoms, check fuses F401and F403, or F402 and F404 before making any furthertroubleshooting checks. If a fuse is open, replace it withone of the exact value and type called for in the servicemanual for that particular chassis. Then, with the speakersdisconnected, check the dc voltage between the two speak-er terminals of the affected channel mentioned in the fol-lowing steps under servicing precautions. If the dc voltageat the speaker terminals is within the indicated limits, thereis probably no circuit malfunction and the chassis can bereturned to service.
Servicing Precautions
In some cases, damage to the amplifier section circuitcomponents and speakers has resulted from improper
AT LAST! PROFESSIONALHOME PROTECTIONEVERYONE CAN INSTALLAND AFFORD.
Model FC-100
WIRED$69 .95Start your customBurglar/Hold-up/Fire AlarmSystem with the FC-100.Add on Sensors, Alarmsand Accessories to suit yourown needs.
"Do -it -Yourself" InstallersHandbook included. Notechnical knowledge needed -No soldering.
100% Professional in Design, Reliability,Performance.
Tail 88firI
SECW'rry CONMOt CEnn-ER
-5,
Safe' -SYSTEM BY EICOA New Concept in "De -it -Yourself " Home Protection
FREE 32 PAGE EICO CATALOGFcr latest catalog on EICO Test Instruments. Stereo, EICOCRAFTProjects, Environmental Lighting, Burglar/Fire Alarm Systems,and name of nearest EICO Distributor, check Reader ServiceCard or send 25c for First Class mail service.
EICO, 283 Malta Street, Brooklyn, N.Y. 11207 Elea.7,11=MMIL
service procedures. Because of the relatively heavy currentsin the amplifier sections of these units, the following serviceprocedures must be strictly observed.
Never replace an amplifier section fuse with a slow blowtype or one of a higher ampere rating than called for in theservice manual. The correct replacement fuses are asfollows:Chassis Model
R243R244R245
Ampere Rating Magnavox Part No.2.5a 181021-12503a 181021-13004a 181021-1400
Never, substitute a higher ampere rated fuse or bridgingdevice, such as a clip lead, for a fuse in the amplifier sec-tion. Such procedures can result in almost instantaneousdamage to speakers and/or components of the amplifiersection.
Always, before connecting speakers to the amplifier,measure the dc voltage at the output of each channel. Thismeasurement can be made at the speaker terminals, be-tween the ground terminal and the hot terminal, but thefront panel mounted speaker switches must first be closedto connect the speaker terminals to the amplifier section.The voltage between the terminals for each channel shouldbe Ov ±-0.2v. If the voltage is not within these limits, thereis a malfunction in the amplifier section and this malfunc-tion must be corrected before the speakers are connected.
Always, immediately upon connecting speakers to theamplifier and before power is applied, check the connec-tions at the speaker terminals to insure that the speakerleads are not shorted together or shorted to the amplifiercase.
Later Version Production Change
Beginning with the "C" version, i.e., R243 -01 -CA, ofthese chassis, fuses F401, F402, F403 and F404 will nothe used in the output circuits of the amplifier section. Thefunction of the fuses will be performed by special type0.47f2 resistors (similar to fusible resistors) used for theR437, R438, R439 and R440 chassis. In the R243 andR244 chassis these special resistors are 0.4711, 2w com-ponents, Part No. 240104-1. In the R245 chassis thesespecial resistors are 0.4711, 3w components, Part No.240104-2. Because of the protective characteristics of thesespecial resistors and their importance in these applications,only the specified Magnavox replacement part should beused if replacement is required.
Power Amplifier Bias Adjustment
To provide a more accurate adjustment of the idlingcurrent through the audio output stages and prevent thepossibility of cross -over distortion, instructions under theheading "Power -Amplifier Bias Adjust" should be changedto the following:
(1) Place the speaker switches to the OFF position andthe VOLUME control fully CCW. (2) Connect a milliam-meter in series with transistor Q415 and Q417 (if the in-strument has fuses in the output circuit, remove a fusefrom the appropriate channel and connect the milliam-meter across the fuse holder) and set the BIAS ADJUST pot,R419, for a reading of between 20ma and 40ma. Or thisadjustment can be made with the following step: Connecta VTVM or other high -impedance voltmeter between theemitter of Q415 and the collector of Q417 and set theBIAS ADJUST pot (R419) for a reading of between 20mvand 40mv. (3) Repeat steps for Q416 and Q418 and ad-just R420 for the same readings. Add these notations toservice manuals 1478, page 8; 1479, page 18 and 1480,page 18.
. . for more details circle 159 on Reader Service Card
60 I ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
NEW PRODUCTS
For additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.
SCOPE 703
Has 35MHz bandwidth with5 my/division sensitivity
A bright 8 by 10 cm display anda rugged portable package are featuresof the Model 3100 scope. This instru-ment has a 35MHz bandwidth with5 my/division sensitivity at full band-width. Rise time is 1 Ons. Sweepspeeds are up to 2Ons per division.
Plug-in semiconductors and modularprinted circuit cards contribute toease of service and calibration. Avariable hold -off delay increases thecapability of the scope for either digi-tal or analog applications. Price:$1,675.00. Raytheon Co.
SURGE ELIMINATOR 704
No installationrequired
The Tube Guard color -TV surgeeliminator reportedly increases thelife of color -TV picture tubes andcomponents. No installation is re-quired. It simply plugs into the wallsocket. Workman Electronics.
ADHESIVE 705
Joins any combinationof materials
Eastman 910 adhesive makes a firmbond in seconds. It joins virtually anycombination of materials at up to5,000 psi, depending on the materialsbonded. It is ready for use right outof the tube. Contact pressure initiatesthe bond and heat is not required toaccelerate setting time. Since heat orsolvents are not required, the adhesivewill not shrink. Recommended appli-cation is one drop per sq in. Cost, at
user level, is roughly 11/2 ¢ per drop.The possible uses of Eastman 910 ad-hesive by TV technicians include therepair of wafer switches, 0 rings, belts
SPRAY
V. a NOACAY.11.1.41LUMP 1011000H.. STUNG.
raM,CA., IUtk6 FOP TECH100.1110
and plastic trim. The adhesive is
packaged in a metal tube and is, there-fore, less susceptible to damage, be-fore use, by heat and humidity. TechSpray.
HIGH -VOLTAGE SOCKET 706
Designed to reduceany danger of fire
A number of new fire -retarding,high -voltage tube sockets, such as theS -105-C shown, have been added to
the line, making the company a singlesource for 74 different types of sock-ets. Oneida Electric Mfg. Inc.
POTELCO POWER PACK 707
For maintaining voltageduring power failure
Potelco power -supplies use nickelcadmium batteries as a dc powersource. The battery is protectedagainst possible deep discharge by abuilt-in protective device, thus guaran-teeing a maximum life of the battery.If ac power -outage should last up to36 hours, the stand-by is reportedlystill ready to initiate the alarm and op -
continued on next page
ele clicPROFESSIONAL COLOR TV
SERVICE EQUIPMENT
ECONO JIGColor Test Jig
11,
diin. r ----'$4995Nei
Complete with less tube ,
all components and cables. Durable metal cabinet. Professional equipment
for rapid servicing.
ADAPT-ALLSYoke Convergence Adaptors
111121Irib4..
s
To service all sets.. with any test jig.
1 4.. FREE: Write for cross-' 'I, reference listing
thousands of sets.
TRANSVERTERSService Solid State TV
-..,
.1.'";s...
On any make test jig withsimple plug-in Transverter.
MOLEX CUSTOMCABLE KIT
Make all combinationsof Molex Cables
.CR-596 contains: . Assortment of
Molex Plugsand sockets.
18 wires,contacts ....,attached. ,
Extractor ,
tool. ,
TELEMATIC DIV., UXL CORP.2245 PITKIN AVE., BKLYN., N.Y.11207
. . . for more details circle 130 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 61
PortableGuardohmmay cut yourTesting Timein Half!
If your people are still using thecalibrate, calculate and specu-late method of testing and trou-bleshooting, now is the time foryou to purchase a PortableGUARDOHM, and switch totime -saving, In -Circuit compon-ent testing.The exclusive Guard Circuit inthe GUARDOHM employs oper-ational amplifiers and electricallyisolates the component undertest to permit accurate, fool-proof, in -circuit testing.This economical, portable testinstrument uses the same GuardCircuit that has been proven byyears of operation in Systoma-tion's $40,000 production PCboard testing systems, and offersmany advantages: No need to unsolder compo-
nents, ever! Direct meter readout of actual
component values, no parallelvalue calculations.
Measures resistance, checkspolarity of capacitors, imped-ance and IR drop of diodes,transistors, and integrated cir-cuits at specified current.
Accurate to -±3%, easy toread linear meter. measures10 ohms to 10 megohms.100NA to 100MA, 0.1 V to1.000V.
IN -CIRCUIT -TESTING is as sim-ple as A,B,C! To test Rn, connecttest leads to A and B, and Guardlead to C. Read the meter.
ONLY
$139COMPLETE
Systomation Inc.GlitIon Park Einora New York 12065Telephone 518.877.7424
NEW PRODUCTS ...continued from page 61
crate a transmitter or dialer and in ad-dition ring a local bell for 10 to 15minutes. To insure full voltage in aprotective circuit loop requiring up to30 mills of current, a limiting resistoris employed. The unit is also protected
against possible overload and shortcircuit conditions by a built-in fusingsystem. Pow -Tee Electronics, Inc.
WIRE STRIPPER -CUTTER 708
Has gauge for uniformlength stripping
With this wire stripper -cutter, insu-lation is removed by putting very lightpressure on the handles with the endof the wire placed in the handle -jaws.The tool is equipped with a stripgauge for uniform length stripping.Stripping AWG standard wire No. 24,
16, 14 and 12, the tool can also be
used as a wire cutter. This wire strip-per reportedly enables cleaner andmore frequent cuts per unit time thanprevious methods. Price $13.75. Star-netics Co.
UHF/VHF AMPLIFIER 709
Delivers gainfrom 50 to 52dB
The MATV amplifier featurescomplete front panel signal controlover the entire frequency range anddelivers gain from 50 to 52 dB withoutput levels of up to 1 v. It is said toprovide maximum performancethrough the use of separate amplify-ing circuits that maintain stable and
efficient operation through all linevoltage fluctuations and temperatureand seasonal changes that normally af-
fect signal levels. Switchable and tun-able FM traps permit tuning out or at-tenuating the entire FM band or a por-tion of it. Separate high and low bandgain and tilt controls permit adjustingsignal levels to precise levels as on -site conditions dictate. Individuallyswitch controlled preamplifier and lineextending power is also included. Inaddition, it has backmatched inputand output monitors that permitchecking the system without disrupt-ing service. Channel Master.
DRY DE -SOLDERING TOOL 710
Removes solder fromjoints and connectors
Solder removal is reportedly fast,economical and convenient when aSoder-Wick dry desoldering tool is
used. When used in conjunction withan ordinary soldering iron, it removessolder from all sizes of electronicjoints and connectors. No specialequipment is needed to remove solderfrom integrated circuits or printedcircuits. The technician simply touchesSoder-Wick to the heated joint andsolder is drawn up. Flux contamina-tion is eliminated, and residue, if any,is non -corrosive and non-conductive.Each roll contains 5 ft of wick andsells for $1.49 per roll. Jensen Toolsand Alloys.
HOOK-UP WIRE 711
Is insulated with irradiatedpolyvinylchloride
RX-7000 hook-up wire is insulatedwith irradiated polyvinylchloride(PVC). The radiation process rear-ranges the molecular structure of PVC,reportedly improving the basic prop-erties of the material. This is said toresult in high-performance electrical,mechanical and thermal characteristicsfor this insulation. Specifications in-dicate that RX-7000 resists high tern-
. . . for more details circle 128 on Reader Service Card
62 ELECTRONIC TECHNICIAN/ DEALER, JUNE 1972
peratures, including contact with a hotsoldering iron, without melting, flow-ing, shrinking back or deforming.Alpha Wire.
HEAT SHRINKABLE TAPE 712
Clings tightly to theobject it surrounds
An irradiated heat shrinkable elec-trical tape is said to shrink, mold, en-capsulate, waterproof and be flexible.The T -Y -T 100 series has an operatingtemperature of -55°C to +125°C.When heated in excess of 121°C, thetape will star to shrink longitudinally.to a maximum of 30%. The innerpolyolefin liner will then melt and flowinto the tape wrappings as well as theinterstices of the object it surrounds.As it shrinks it clings tightly to the ob-ject it surrounds and the shrinking
action eliminates wrinkles and bubblesin the tape wrap. When cooled, the re-sulting fusion forms a tight mechani-cal fit, bonding and molding to itself,forming a complete encapsulating bar -
tieno.
le cooled wrap reportedly can-xeled off. Cole -Flex Corp.
E
,r appeared in the EICO ad6 of the April 1972 issue.t price for the Model FC-'Fail Safe' -System by EICOather than the price given
E
tong price was given for theEKU ._olor Tube Tester described onpage 69 of our April 1972 issue. Thecorrect price is $49.95.
NOW...ONE PERMA-POWER BRITENER SOLVESBOTH KINDS OF COLOR TV PICTURE PROBLEMS...co 0 I
NEW BRIT HAS BOTH...
ISOLATION AND BOOST!04
This efficient new , When needed later,Britener corrects for 1.110.00111, M0011 sliding the boost switchcathode -to -filament r i raises electron emissicn,shorts causing loss of restores full contrast andblack and white video sharpness to fading-drive . . . isolates the picture.short, restores the blackand white informationnecessary for color pic-ture quality.
r- - - Noo'S-.0. ...,....... __,,,
d, tir ,-,A.,..t..4,:, '1 ,-.._
.....11.406 C-51
Model C-503for round tubes
eRma OUR Model C-513for rectangular tubes
PERMA POWER DIVISION OFCHAMBERLAIN MANUFACTURING CORPORATION 1 Dealer Net 57.75
5740 North Tripp Avenue, Chicago, Illinois 60646 (312) 539-7171
The rightreplacement, fasterwith n NEW
SERVICE
KITS
from your CentralabDistributor
KITS AVAILABLE:
Fastatch II" Controls Miniature Wirewound Controls
Miniature Trimmer Controls Axial Lead Electrolytics
PC Lead Electrolytics General Purpose Capacitors High Voltage Capacitors Packaged Electronic Circuits
KIT FEATURES:
Rugged steel frames with highimpact plastic drawers. Stackable or wall mounted.
Portable, with convenient handles.
All contain assortment of themost popular and widely usedCentralab components.
All control units (KIT -10F, -20W,-30T) include latest edition of H. W.Sams Replacement Control Guide.
All components are functionallyarranged in drawers by value,type, etc.
All drawers are pre -labeled clearlyshowing contents.
All kits are completely set up,ready to use.
By Centralab, yourParts -Time Helper
DISTRIBUTOR PRODUCTS
al=1EM
OMIF
CENTRALABEiectronics OtwsionGLOBE -UNION INC
. . . for more details circle 122 on Reader Service Card ... for more details circle 103 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 63
DEALER SHOWCASE
For additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.
STEREOPHONES
Features high-performancedriver elements
713
The Model K-711 is said to featurehigh-performance driver elements, aswell as a distinctive one-piece head-band of flexible, high -strength poly-propylene to conform to any head size
for comfortable wearing. It is report-edly available in either red or black.Price: $29.95. Koss Corp.
AUTOMOBILE RADIO 714
New concept"tack" radio
This new concept in automobile ra-dios has speed equipment styling. It is
priced at $59.95 and can be installedby the do-it-yourselfer. Sanyo Electric,Inc.
ANTENNA MULTICOUPLER 715
Provides uniform gain,high isolation
The Model 909084 solid-state an-tenna multicoupler is said to provideuniform gain, high isolation and sep-arate HF and VHF outputs. Designedto cover the I.5MHz to 100MHz fre-quency range, this multicoupler re-portedly exhibits a 10dB gain from in-put to any of 8 outputs, 50dB mini -
Quick -Servicing Info About
COLOR TV, B -W TV,
and STEREO
TV 1101 11111
1970
TV TECH AIDTakes you right to the sourceof the trouble without guesswork and wasted time. In eachmonthly issue you receive over
40 actual causes and cures of color and B&W TVtrouble symptoms. You also receive timely and com-plete information about circuit modifications andother valuable service data.
Place your 1972 subscription now.All new. H 12 Issues $7.95
Get these valuable back issueswhile they last At Reduced Rates
SEND YOUR CHECKOR MONEY ORDER
TO:
TV TECH AIDP. 0. Box 603
Kings ParkN.Y. 11754
1969-12 Issues $4.95 1970 -Book Form $5.95
1971 B&W Book $5.95 1971 12 Issues $7.95
1972 All New 12 Issues $7.95
Name
Address
City
State Zip
... for more details circle 134 on Reader Service Card
64 ELECTRONIC TECHNICIAN/DEALER, JUNE 19/2
mum isolation between outputs, typi-cally 100dB dynamic range, and a 7dB
maximum noise titture. Merrimac Re-search and Development, Inc.
TWO-WAY RADIOS 716
Feature mobile -to -baseinterchangeability
Operating in the 450 to 470MHzband, the solid-state MOCOM seriesFM two-way radios are available with1 or 4w in the MOCOM 10 versionand lOw in the MOCOM 35 version.Featuring mobile -to -base interchange-ability, a mobile unit can be substi-tuted for the base unit, assuring con-tinuous system operation even if the
base should require servicing. Motor-ola Communications and Electronics,Inc.
MINI TV CAMERA 717
Functions with all makesof 1 -in. vidicon tubes
The Minicon Model 201 is a newself-contained miniature TV cameraoffering a wide choice of line rates.Combining high sensitivity and resolu-tion in a small package, the unit re-portedly provides sharp TV images
with scene illumination as low as 1 ftcandle. In addition, the camera re-portedly functions with all makes ofI -in. vidicon tubes-including the new
11111114
silicon diode types. Other features in-clude automatic compensation forvidicon dark current shift, 18MHzbandwidth with 12MHz internal filter,simple maintenance and AGC/ATC.Remote controls are an available op-tion. Sierra Scientific Corp.
CASSETTE HEAD CLEANER 718Removes dirt and oxidefrom the magnetic heads
The QM -140 cassettehead cleaner isdesigned to re-move accumu-lated dirt andoxide from themagnetic headsin cassettemachines -thus prevent-ing spacinglosses and pro-tecting expensive pre-recorded tapes.The product features a special non-abrasive 9 -ft belt that is said to re-move built-up contaminants complete-ly without damaging the head surface.Nortronics Co., Inc.
IC)OMSERIES
* moo *
HOME ADAPTER 719
Delivers 12v dc at 3a, 5aof switchable current
When plugged into the power line,the Model 3AS12 home adapter re-portedly will deliver 12v dc at 3a and
provide 5a of switching current. Theunit has an ON/OFF switch, pilot light,and an automatic circuit breaker; andis housed in a gold finished cabinet.Alpha Components Corp.
RECORDING -PLAYBACKEQUALIZER
Allows control of ± 12dBon each octave
720
Frequency -balanced tape and discrecordings reportedly can be madewith the model R P10-12 equalizer. Fre-quency control flexibility is offered inboth recording and playback modes,with instant monitoring of the alteredand unaltered signals. Connected intothe tape monitor circuit of Hi-Fi sys-tems or between the preamplifier and
I iiftlitUYas, 011 1111 NOM
1_
basic amplifier in commercial soundapplications, this product allows con-trol ± 12dB of each octave. Sound -craftsmen.
CB IWO-WAY SYSTEM 721
Provides 5w oftransmit power
A new 5w Citizen -Band two-wayradio system, designated PACE 100-Sa, is complete with clip -on antennaplus crystals installed for Channels 9,11, 12, 13 and 14. The unit providesfor full 5w of transmit power with pro-vision to operate on Channel 9 CB foremergency use, plus Channels 11, 12,13 or 14 CB for general conveniencecalling. An additional channel may be
selected from the 23 channels assignedto the Citizens Radio Service to pro-vide a total of 6 channels of opera-tion when desired. It has visual indi-cator lights to indicate the transmittingor receive mode. A meter is includedso that an incoming signal may beseen if the volume is turned low.Pathcom, Inc.
BUSINESS RECORDS...continued from page 54
can have a major effect on a newbusiness program being developed.
Contracts, copyrights, patents,franchise agreements, etc., all are ofmajor importance to the continuedoperation of the business. They needas much, if not more, protectionthan the tax records.
It is important to remember thatany record or document that hasvalue today will be equally impor-tant in the future as well. If it hasdisappeared in a fire, been stolen orlost, replacement may be nex: toimpossible.
All of the records that have beenmentioned are essential for the fu-ture operation of the business, largeor small, and should receive full se-curity. To these may well be addedbasic customer records-particular-ly when credit is offered.
MOLDED PLASTIC
COLOR CODED
AMP FUSES20 Different
Models
Reliable protective fusing devicefor replacement of original man-ufacturer's part numbers.
Listed in Howard Sams' Photo -facts and Counterfocts.
FREE vest pocket cross refer-ence booklet indicating correctWorkman part numbers to manu-facturer's port numbers. No. X58
MANUFACTURED BY
WORKMANSubs.d.a, TECII.LaGY IKBOA 3828 SARASOTA. FLA 33578
leWitaPRODUCTS, INC
... for more details circle 136 on Reader Service Card
4.4712
TOMORROW.
1:111 L
11
--- -7TAPEPLAYERS
riPARTS & ACCESSORES
- .
...--,DC MOTORS & BELTS
COMPLETE CATALOG AVAILABLE.
CALL YOUR WELTRON DISTRIBUTOR TODAY!
or write or cal direct:
eltronCOMPANY
514 East Peabody Street. Durham. N.C. 27702919-682-0333
CES Booth 226... for more details circle 135 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 65
Don't letthis familiarface fool you.
Messenger 123Ais all new inside.
We've taken our most popular23 -channel CB two-way radio andgiven it completely new circuitry!New ceramic filter for greatselectivity. New acousticallyisolated speaker for clearer sound.And more. All for a suggestedprice of $149.95.
You're going to hear
more from...
*JOHNSONWaseca Minnesota 56093
. for more details circle 117 on Reader Service Card
REBUILDYIUR OWN
PICTURE TUBES?
With the Lakeside Industries precision picturetube rebuilding unit, you can rebuild any pic-turn tube, be it black and white or color or20mm or etc. We offer you the most revolution-ized precision equipment of our modern times.This unit is easy to operate and requires only4 x 8 ft. of space. You can rebuild the finesttube available. The picture will be clear andsharp. Your cost to rebuild a color tube is$6.60. Your cost to rebuild a black and whitetube is $1.85.Profit? Imagine building four color tubes perday and if you sold these tubes for $60.00each. Total income $240.00. Total cost $26.40.Net profit $213.60. Multiply this figure by fivedays per week. Your profit $1,068.00 per week.Cut this figure in half! Build and sell only twocolor tubes per day. Your profit $534.00 perweek. Facts are facts, figures do not lie.
For further information, please send your nameand address to Lakeside Industries, 3520 WestFullerton, Chicago, III. 60647. Phone: (312) 342-3399.
P.S. No salesman will call.
TEKLABcontinued from page 43
an emitter follower for each pair ofdifferential transistors. It is said toprovide excellent characteristics andgood AM rejection with an overallgain of 60dB.
The quad detector portion of theIC operates as a full -wave detector.This type of a detector has somedesirable properties that make itparticularly suitable for FM detec-tion. No fundamental carrier fre-quency is present at the detectoroutput, decreasing the susceptibilityof parasitic noise. The detector doesnot provide gain at the carrier fre-quency, decreasing the risk of oscil-lations. The output voltage swing ofthe detector is determined only bythe deviation of the input signal, notby the amplitude variations of theinput signal. Detected audio signalsare received from Pin 2 (audio out-put) of the IC, through a capacitorto Pin 9 of the IC, which is the pre-amplifier input terminal.
The audio preamplifier withinthe IC is basically a single common -emitter stage with emitter -followercircuits used before and after thestage. The preamplifier and driverstage function basically the same asin previous transistorized chassiswhere separate preamplifier anddriver transistors were employed.This stage provides the necessarycurrent gain to drive the audio out-put stage.
A conventional audio output stageemploys a common -emitter, class -Aamplifier, which develops approxi-mately 1w to drive a 3.211 speaker.This circuit is basically the samesystem employed in the 20KT41 se-ries chassis.
ConclusionWe feel that the TV set produces
an excellent picture and is verystable. The many automatic circuitsmade the TV set easy to adjust andwill help to eliminate tuning confu-sion for some customers.
From the servicing viewpoint wefeel that the manufacturer did anexcellent job on the most importantpart of servicing-the servicingdata. In addition to the regular data,they have added voltage and resist-ance charts for the transistors andtubes. Also, pictorial views of thechassis wiring are given along withthe wire color code for variouschassis circuits.
LETTERS...continued from page 29
ondly, although most of our readersare TV -set service electronic techni-cians who specialize in TV -set servic-ing, we do have a significant numberof readers who are qualified (with theproper license and instrumentation)to do CB servicing. We know of noother publication that serves thesetechnicians and do not feel that theyshould be ignored.
We originally planned on printingthe second in Mr. C. A. Tuthill'sseries of articles in this month's issue,but would first like to hear how ourother readers feel concerning thissubject. Ed.
Comments on Earlier LettersIn the November issue of ELEC-
TRONIC TECHNICIAN/DEALER, the let-ter from Joseph Dianella and the let-ter from Tony Cizerle were comple-mentary to each other.
I have been in the electronics ser-vicing industry for the last 25 years at
(CORNELLJ ELECTRONICS COMPANYTHE ORIGINAL
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Your Order FREE if Not Shipped in 24 Hours... for more details circle 118 on Reader Service Card
66 I ELECTRONIC TECHNICIAN, DEALER, JUNE 1972
... for more details circle 107 on Reader Service Card
KEEP 'EM QUIET...
andclhAbriigwithQUIETROLE
When you useQuietrole, you can
be sure of clean, quietoperation, because you
are using the number one cleaning andlubricating spray pack available.Safe for any set, color, orblack and white. Absolutely 4 orno harmful aftereffects ofany type.
In bottles too, if you prefer.
QUIETROLE . . the choice ofbetter servicemen everywhere.
Product of
QUIETROLECOMPANY
Spartanburg, South Carolina... for more details circle 123 on Reader Service Card
TYMETER'',Is AI Al Glance
DIGITAL CLOCKS9:37
DIGITALCLOCK MOVEMENTS#130..12 HOUR #131..24 HOUR
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PENNWOOD NUMECHRON CO.TYMETER ELECTRONICS
DIVISION OF LCA CORPORATION7709 FRANKSTowN AVE PITTSBURGH, PA woe
... for more details circle 121 on Reader Service Card
the manufacturing, distributing andretailing levels, and have progressedfrom factory and bench technicianthrough management positions. I felt20 years ago that compulsory licens-ing for technicians could do nothingbut enhance the status and income oftechnicians and shop owners alike. Li-censing will most probably lead tounionization of the licensed techni-cians and this is not necessarily badfor shop owners. This is the history ofthe craft unions that were licensed inthe 1930's. The increased income andwages for the craft technicians allowedthe shop owners to charge the neces-sary rates to insure a good income,both for themselves as well as for thepeople who work for them.
I spent 18 years working for oneman who today is a millionaire. Whatstarted as a one-man shop became alarge servicing organization, whichbranched into other parts of the elec-tronic industry. Most of the peoplewho helped this man grow and be-come rich were given the usual pat onthe back and promises of things tocome.
After 18 years, I finally became-too soon old and too late smart" andleft with a good case of nerves and ab-solutely nothing in the way of retire-ment, profit sharing, etc.
The shop owners will never upgradetheir image in the eyes of the consum-er until such time that they upgradethe people who are working for them.The glamour of working on TV setsback in the mid -40's and early 50's isno longer there. Many of us were will-ing to work to learn, but when a manreaches his 40's, if he hasn't learnedhis trade by then and become a first-class craftsman, then he has been inthe wrong business and it is the shopowner's and manager's duty not tocarry any dead wood.
There have been many articles andletters in the industry press about thebackground and education needed fortechnicians in the consumer electronicfield, and many comparisons as to thequalifications for this field as com-pared to an electrician. The fact thatconstruction and repair electriciansmake over $8.00 an hour in almostall areas of the country with less ne-cessary training and education thanelectronic technicians, speaks well forthe electricians and their unions. It ispast time for us to follow their exam-ple.
Legislation forcing all techniciansto be licensed will force the owners ofthe servicing firms to change the ratesto cover the salaries that the organizedtechnicians would then demand. Ihave not been a working technicianfor many years, but have been on the
conlinued on page 68
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... for more details circle 126 on Reader Service Card
T & TVALUE SALERAYTHEON NEW JOBBER -BOXED TUBES
E 6G1113 5 for $3.45 6DW4 5 for $4.05O 61E6 5 for $8.80 3A3 5 for $4.40O EQUIV. ASTATIC BSR TC8H-(boxed) $1.25O EQUIV. ASTATIC BSR SX1H-(boxed) $1.50O EQUIV. ASTATIC BSR TC8S-(boxed) $1.50
XACT. REP. FOR EV5015-(boxed) $2.50 XACT. REP. FOR ASTATIC 142
Cart -(boxed) $2.000 XACT. REP. FOR SONOTONE
IITAS-(boxed) $2.50 XACT. REP. FOR EV-26 STEREO
CART -(boxed) $1.75 150 MFD 200 DC WV CAPACITOR 2 for $1.000 40 14 40MFD at 450 Volts DC 2 for $1.00O 2 AMP. 1000 PIV RECT 10 for $1.000 STEREO HEADPHONES -(Ind. Boxed) $3.95n REMOTE MIKE with MIN. & SUB
MIN. PLUG 3 for $5.00E 25 ft. CURLEY STEREO HEADPHONE
EXTENSION CABLE PEG -PACKED $1.500 SHORE M7 -M3 DIAMOND NEEDLE $1.50O SILICON DIODES, Gen. Purpose, replaces
IN34, 1N51, IN60, etc. 20 for $1.00O RAYTHEON, IEC, RCA, G.E., SYLVANIA,
ETC., TUBES up to 80% off listFREE GIFT WITH EVERY ORDER!
Minimum Order $20 - F.0.8. Brooklyn
& T SALES CO.)4802 AVENUE K
BROOKLYN, N. Y. 11234Phone: (212) 241.5940
. . . for more details circle 129 on Reader Service Card
JUNE 1972, ELECTRONIC TECHNICIAN/DEALER 1 67
SOLVE YOUR DRIVEBELT PROBLEMS IN
MINUTESwith ONEIDA'S all newDRIVE BELT KITSEliminates "Down Time" on special andforeign belts.
No need to stock replacement belts; makesany size in minutes.
No molds or complicated vulcanizing proc-esses to follow.
No special skill required, cutting guide, cut-ting tools and adhesive all included.
Special Insta-Weld F: adhesive makes re-placement belts as strong as or strongerthan originals for lasting repairs.
ORK-1 Round Rubber DriveBelt Kit $19.95
ORK-2 Flat and SquareRubber Drive Belt Kit $19.95
ORK-3 "0" Ring Kit $19.95Get up to five times your investment back in beltsales. Each of these kits will make from 80-100dollars or more in rubber drivewith the kit is the special cutting guide, razorblade, Special Insta-Weld® adhesive, a large quan-tity of rubber stock and easy -to -follow directions.Nothing has been left out. Packed in an attractive,handy, plastic box that fits into the tube caddy oron the bench. Now, you can replace over 90% ofthe belts found on tape recorders, phonographsand cassette recorders, both foreign and domestic,right on the spot. Check with your distributor now.If he doesn't stock them, ask him to order themfor you today.
PERMABOND ADHESIVEPOWERWITH
ONEIDA'SInsta-Weld®Makes SpaceAge Bonds
Great for: Rubber Plastic Metal Ceramics Glass Etc.
Insta-Weld,i; is new, not epoxy, nothing you haveheard of before. There is no mixing, just applyand hold parts together. Just seconds are all thatis required for a bond stronger than anything youcould ever get before. One drop supports 2,000pounds per square inch.
Now make economical repairs that were never be-fore possible. Extremely economical, up to 132
bonds per tube.
NEW INSTA-WELD'only $2.00 per 2 -gram tube
AA:Ah ELECTRONIC MFG., INC.MEADVILLE, PENNA. 16335
READERS
SERVICEINDEX
ADVERTISER'S INDEX101 B&K Div., Dynascan Corp.
. ..24102 Book Club-Tab Books 34-37103 Centralab Distributor Prod.
Globe -Union Inc. . ... .63
104 Chemtronics, Inc.105 Columbia Electronic Cables, Div. Avnet .49106 Cooper Industries, Inc., Weller Div. 38107 Cornell Electronics Co. 66108 Eastman Chemical Products Inc. 23109 Eico Electronic Instruments Co., Inc. 60110 Finney Co., The 50111 Fordham Radio Supply Co., Inc. 68112 Ford Marketing Corp., Ford Div. 59113 GC Electronics Company 27
General Electric Co.Tube Product Dept. 33GTE Sylvania, Electronic Components 20-21
114 Heath Company, The 26115 Jensen Tools & Alloys 68116 Jerrold Electronics Corp. 2nd Cover117 E. F. Johnson Company 66118 Lakeside Industries 66119 Mountain West Alarm Supply Co. 68120 Oneida Electronic Mfg. Inc. 68121 Pennwood Numechron Company 67122 Perma-Power Co.
Div. Chamberlain Mfg. Co. 63123 Quietrole Company 67124 RCA Parts & Accessories 28125 RCA Parts & Accessories 29
RCA Semiconductor DistributorProd. . . ,, 4th Cover
126 RMS Electronics, Inc. 67127 Rohn Manufacturing Co. 56128 Systomation, Inc.
. 62129 T&T Sales Company .. .67108 Tech Spray ..23130 Telematic Div., UXL Corp ..61131 Texas Instruments Incorporated
Components Group 31132 Triplett Corporation .. 3rd Cover133 Tuner Service Corporation 19134 TV Tech Aid 64135 Weltron Co., Inc. . . .... .. 65136 Workman Electronic Products, Inc. 65
Zenith Radio Corporation 55
NEW PRODUCTS700 Marine VHF Radiotelephone 32701 TV and FM Antenna 32702 AM/FM Function Generator 32703 Scope ....... . 61704 Surge Eliminator 61705 Adhesive 61706 High -Voltage Socket .. 61707 Potelco Power Pack . 61708 Wire Stripper -Cutter .. 62709 UHF/VHF Amplifier 62710 Dry De -Soldering Tool 62711 Hook -Up Wire 62712 Heat Shrinkable Tape 63713 Stereophones 64714 Automobile Radio .. 64715 Antenna Multicoupler 64716 Two -Way Radios 64717 Mini TV Camera 64718 Cassette Head Cleaner 65719 Home -Adapter 65720 Recording -Playback Equalizer 65721 CB Two -Way System 65
TEST INSTRUMENT900 Triplett's Model 603 FET VOM 57
FREE CATALOGHARD -TO -FIND PRECISION TOOLSList, more Mini 1700 itur.s-plour, ,tweezers, wire strippers, vacuum systems,relay tools, optical equipment, tool kitsand cases. Also includes four pages ofuseful "Tool Tips" to aid in tool selection.
A ..TICINTIE3ECINT TOOLS nnA ALLOYS4117 N. 44th Street, Phoeniz, Arizona $50111
. for more details circle 115 on Reader Service Card
TESTEQUIPMENT
atDiscount
Prices4-1E3
l*JCCD1=tEquipment by Other
Manufacturers also Available
Catalog & Priceson Request
FORDHAM Radio Supply Co., Inc.265 E. 149 Street, Bronx, N.Y. 10451
Tel: (2 1 2) 585-0330 RC/1DISTRIBUTORS OF ELECTRONIC SUPPLIES
... for more details circle 111 on Reader Service Card
TAPE SYSTEM ...ontinued from page 45
far, few four -channel players or re-cordings are available, but the con-cept is catching on rapidly and willundoubtedly assume a major role inthe market.
Among tape formats, the princi-pal four -channel activity today is ineight -track cartridges. The eight -track tape is wide enough to accom-modate four separate or discretechannels of music. Four -channelsound can be achieved in cassettesystems by electronically combiningthe four channels into two on thetape by a technique known as thematrix system. Open reel would alsolend itself to discrete four -channel,but there has been relatively littleprogress in this part of the marketto date.
FREE ALARM CATA64 PAGES FILLED WITH 3S0 BURGLARAND FIRE ALARM PRODUCTS FORINSTALLERS AND ELECTRONICTECHNICIANS. INCLUDES RADAR,INF RARE°, CONTROLS, HARO-TO-F IND PARTS, AND 6 PAGES CHAPPLICATION NOTES.
mountain west alarm .7;
WI 4215 n. 16th st., phoenix, az. 85016
for more details circle 119 on Reader Service Card
LETTERS...continued from page 67
management side of the desk. How-ever, manager's salaries are usuallytied to technician's salaries, and exceptfor the owner operators of mediumand large organizations, the technicalmanagers also suffer because of thelow rates that are charged to custom-ers and directly related to that, the lowwages paid to the technicians.
NAME WITHHELD UPON REQUEST. . for more details circle 120 on Reader Service Card " 68 ELECTRONIC TECHNICIAN/DEALER, JUNE 1972
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101 110 119 128 137 146 900 909 700 709 718 727 736 745
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Service 103 112 121 130 139 148 902 911 702 711 720 729 738 747
104 113 122 131 110 149 903 912 703 712 721 730 739 748
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123
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132
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141
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150
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704
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740
741
749
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107 116 125 134 143 152 906 915 706 715 724 733 742 751
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142150151
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107 116
108 117
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126
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"TRIPLETT MICRO-POWER"TMModel 603 FET V -O -M
Combines
4 V -O -M
firsts
1W TRIPLETTMICRO POWER
V -C -M
O
TO
AS -4 -2luiluii
0
/4011111 603'III I
0C11.0,01001
/ZERO
300
t 100
C 30
O 10-24
I
30
0
IEEE .3
B ATT CHECK
0 xl MEGOFF
x10 K
x1K
x100
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xl
1000
100
10
AC DC M
FET Input Circuit -which Triplettpioneered in the Model 600.LPL!' Low Power Ohms -whichTriplett pioneered in the h.odel 601.Auto -Polarity - which Triplett pio-neered in the Model 602.TMPT' Triplett Micro -Power -whichTriplett is pioneering in the Model603.In fact, the Model 603 FET V -O -Mcombines all 4 of those pioneeringfeatures to make it the most feature -packed V -O -M that Triplett or any-one else has ever offered.The new innovation -Triplett Micro -Power - is a revolutionary V -O -Mcircuit with such a tiny power con-
sumption that the service life of itsordinary carbon batteries is equal to,or longer than, their normal shelf -life.Imagine a V -O -M which needs bat-teries only once a year.And the Model 603 has a simple, un-cluttered dial with just four scales tocover 44 ranges, a null -type zeroadjustment for quick setting with noparallax error, a suspension move-ment that soaks up the shocks ofeveryday bench and field use, anda built-in overload protection thatshrugs off overload.This great, new, feature -packed tester...Trip'ett's Model 603 FET V -O -M...is available for immediate delivery
... for more details circle 132 on Reader Service Card
$1501. Exclusive TRIPLETT MICRO -POWER -TMP provides battery life in excess ofa yec r for carbon batteries.2. LOW -POWER OHMS-LP SI rangeswith 70 mV power source for in -circuitmeasurements without component damage.3. FET V -O -M WITH AUTO -POLARITY -convenient and time -saving, always readsup -scale.
through your local Triplett Sales/Service/Modification Center or dis-tributor for $150. For more informa-tion, or for a free, no -obligationdemonstration, see him or your Triplettsales representative. Triplett Corpora-tion, Bluffton, Ohio 45817.
itsTRIPLETTBLUFFTON, OHIO 45817
The Worlds most complete line of V 0 M'schoose the one that's right for you.
What do RCA SK series devices havethat other replacements don't?
SOLID-STATEHARDWARE
10 sockets for transistors and IC's.15 heat sinks from TO -18 to
TO -3 package styles
QUALITYPRODUCT
Top -of -the-line quality Meet -or -beat specs 23 new types Now 120 SKs replacemore than 46,000devices
All three make up the RCA Solid -State System - aproduct and back-up approach to a replacement line ofdevices with the professional technician and service dealers'needs in mind. You put the elements together - and theywork. Product is top -of -the -line. Literature is accurate andcomprehensive, and hardware helps in your day-to-dayservicing.
Remember, RCA's Solid -State System is based onpremium product - more than 120 different devices (in-cluding 23 brand new ones) that can replace more than46,000 units, both foreign and domestic. They cover thefull range of replacement needs - from small signal types,integrated circuits, insulated gate and junction type FET's,
RCA
INFORMATIONSUPPORT
Accurate Comprehensive New SK Replacement Guide New SK Wall Chart Transistor Tape/Slide Educational Shows Manuals
to the newest silicon audio 100 -watt output types.Designed especially for replacement use, RCA SK
units are backed by electrical characteristics that makethem comparable to or better than original devices. Thereare no cast-offs or factory seconds.
All units and the types they replace are cross-refer-enced in the RCA Replacement Guide, SPG-202M. There'sa Quick -Selection Wall Chart, too, 1L1367A, and newAudio -Visual service aids. These spell the industry's finestinformational backup for replacements - all SK, all avail-able from your RCA Distributor. See him today for yourcopies.
RCA Electronic Components I Harrison I N.J. 07029.
ElectronicComponents
