GTE Sylvania RS-4744 User manual

GTE SYLVANIA
FACTORYPREPARED
TECHNICAL SERVICEDATA
STEREOHI-FI
BULLETIN:R67-3
MODEL:RS4744
SERVICEPUBLICATIONSDEPARTMENT
EntertainmentProductsGroup700EllicottStreet- Batavia,N.Y.
MODEL:RS4744
CHASSIS: R67-3
PRODUCTSAFETYGUIDELINESFORALLPRODUCTS
CAUTION: DoNOT modify any circuit. Serviceworkshould be performedonlyafter youare thoroughlyfamiliarwith allofthe
followingsafety checks. Risk of potentialhazards and injury tothe userincreases if safetychecks arenot adhered to.
SAFETYCHECKS
SUBJECT: Fire & ShockHazard
1. Besurethatallcomponentsarepositionedinsucha wayto
avoidpossibilityofshortstoadjacentcomponents.Thisis
especiallyimportantonthosechassiswhicharetransported
toandfromthe repair shop.
2. Alwaysreplaceallprotectivedevicessuchasinsulatorsand
barriers after workingona set.
3. CheckfordamagedinsulationonwiresincludingtheAC
cord.
4. Checkacross-the-linecomponentsfordamageandreplaceif
necessary.
5. After re-assemblyoftheset,alwaysperformanACleakage
testontheexposedmetallicpartsofthecabinetsuchasthe
knobs,antennaterminals,etc.tobesurethesetissafeto
operate withoutdangerofelectricalshock.Donotusea
lineisolationtransformerduringthistest.UseanACvolt-
meter having5000ohmspervoltormoresensitivityinthe
followingmanner:
Connecta 1500ohm10wattresistor,paralleledby
.15MFD ACtypecapacitor,betweena known good earth
ground(waterpipe,conduit,etc.)andtheexposedmetallic
parts, oneata time.MeasuretheACvoltageacrossthe
combination1500ohmresistor,and.15MFDcapacitor.
Reverse theACplugonthesetandrepeatACvoltage
measurementsagainforeachexposedmetallic part. Voltage
measuredmustnot exceed .3voltR.M.S.Thiscorresponds
to0.2milliampAC.
Any valueexceedingthislimitconstitutesa potentialshock
hazard andmustbecorrectedimmediately.
IMPORTANT: AlwaysusegenuineSylvaniareplacementpartsand tubes.
Price $1.75

ChassisIdentification consists oftwoblocksofnumbers.Inall
correspondencerelatingtoa specificmodel,bothblocksof
numbers, plusthecabinetmodelnumbershouldbegiven.To
associatea chassiswithitsproperschematic, refer tothenum-
ber breakdowndescribedbelow:
R67PERFORMANCEANALYSIS
TheR67-3Amplifieriscapableofdelivering60 Watts - per-
channel (21.91V., R.M.S.,measuredacross8 ohmloadresis-
tors) ata frequencyrangeof20Hzto20kHz.
Maintain 120VAC, 60Hzlineforalltests.
Usea 60 Watt, 8 ohmnon-inductiveloadacrosseachchannel
outputduringamplifierperformancetests,unlessotherwise
noted.
Amplifier IDLE CURRENTissetwiththeentirechassisat
ROOMTEMPERATURE.Makethismeasurementwithin30
seconds after turn-onifpossible.Basically,theidle current
shouldNOTbereadjustedunlesscomponentchangeshave
been madeintheBiasRegulator,DriverorOutputcircuits.
Measure idle current withnoinputsignalandnooutputload.
Adjust R822forapproximately9 tollmVacrosspinsLUand
LV. AdjustR922forapproximately9 tollmVacrosspins
RUandRV.
Sincetheidle current will drift upwardastheamplifierwarms
up, R822andR922shouldbeset ONCE - ANDNOTRE-
ADJUSTED.
TheDCOFFSETvoltageismeasuredacrossthespeakerterm-
inals, nosignalinputandnooutputloads.DCoffsetshould
read less than±150mVbetweenmainspeaker"+"and"-"
terminals oneachamplifierchannel.
HUMAND NOISE:
SWITCH POSITIONS
Loudness OFF
High Filter OFF
LowFilter OFF
CONTROLSETTINGS:
Volume
MAXIMUM (CLOCKWISE)
Bass MECHANICALLY
CENTERED
Mid-Range MECHANICALLY
CENTERED
Treble
MECHANICALLY CENTERED
Balance MECHANICALLY
CENTERED
LoadAUX.andTAPEinputswith4.7K,5%resistors.
Load PHONO andMIC.inputswith330ohm,5%resistors.
(UsestandardstereophoneplugonMIC.inputs.)
Orient ACpowerplugforminimumhum;readhumlevel
across8 ohmloadresistors.Ignore major meterfluctuations.
SELECT
FUNCTION
MAXIMUM
HUMLEVEL
AUX.
3mV.
MIC.
50mV.
PHONO
40mV.
TAPE
3mV.
SENSITIVITY:
Usesameset-upasforhumand noise - removeloadsfrom
inputtobetested.
Testsignalsourceimpedanceshallbe600ohmsorless.
Drive bothchannelssimultaneouslywitha 1kHzsignalat
levelschartedtoproducetherated(60WATTS- PER- CHAN-
NEL)outputof 21.91V, R.M.S.across8 ohmloadresistor.
Selectfunctionasrequired.
POWER AUX.
MIC.
PHONO
TAPE
AMP.
1.4V. 250mV.
1.2mV. 2.2mV.
250mV.
(TYP.) (TYP.) (TYP.) (TYP.) (TYP.)
TOTALHARMONICDISTORTION:
SwitchandcontrolsettingsareasoutlinedunderHUMand
NOISE section.
Testsignalsourceimpedanceshallbe600ohmsorless.Inject
testsignals,atfrequenciescharted,attheAUX.inputs.Select
theAUX.function.
Drive bothchannelssimultaneouslyforanoutputof60 Watts
per channel (21.91V, R.M.S.- measuredacross8 ohmload
resistors). Measuredistortionatthissamepoint.
FREQUENCY
MAXIMUM
DISTORTION
18Hz .25%
1kHz .15%
20kHz .25%
PHONO INPUT OVERLOAD:
Measure distortionatTAPERECORD JACKS.
Select PHONO function.Maintainoutputat10dBbelow60
watts atamplifieroutputwithvolumecontrolasinputsignalis
increased.
A 1kHzinputsignalof60mV.MINIMUMshouldberequired
toshow less than.25% T.H.D. atTAPERECORD JACKS.
CHANNEL UNBALANCE:
Drive bothchannelsthroughtheAUX.inputswitha 1kHz
signalleveladjustedforanoutputlevelofapproximately1
Watt (2.83V,R.M.S.)measuredacross8 ohmoutputloadre-
sistors, withcontrolsadjustedasfollows:

PERFORMANCEANALYSIS(CONTINUED)
VOLUME- AtTape.
TONE andBALANCE- Centered.
SelectAUX.function.Allother FUNCTION and MODE
buttonstobeintheout(OFF)position.
MAXIMUM channeloutputdifferenceshallbe4 dB.
TONE CONTROL RANGE:
Drive bothchannelsthroughtheAUX.inputswitha 1kHz
inputsignalleveladjustedforanoutputlevelofapproximately
1 Watt (2.83V,R.M.S.)measuredacross8 ohmoutputload
resistors - VOLUME CONTROL ATMAXIMUM.
Bass,Mid-rangeandTreblecontrolsaretobeinthecenter
(FLAT)positionforestablishingreferenceoutputlevels.
Switchgeneratortochartedfrequenciesatsameoutputlevel
tomeasuretonecontrolrange.
SelectAUX.function.Allother FUNCTION and MODE
buttonstobeintheout(OFF)position.
CONTROL GENERATOR CUT BOOST
FREQUENCY
(FULL C.C.W.)
(FULLC.W.)
BASS
100Hz
-13 dB + 13 dB
MID-RANGE 1kHz
-10 dB +
10 dB
TREBLE 10kHz
-12 dB
+11 dB
±3dBTOLERANCE
COMPENSATION:
Usethesameset-upasfortonecontrolrange.Activatingthe
modebutton specified willchangetheamplifieroutputlevelas
charted - withaninputleveladjustedforanoutputlevelof
approximately 1 Watt. CheckloudnesscompensationatVol-
umeControltap,HiFilterandLoFilteratMaximumVolume.
BUTTON GENERATOR OUTPUT LEVEL
FREQUENCY CHANGE
HIGH FILTER 20kHz
23 dBCut,±3dB
LOUDNESS
100Hz
6 dB Boost, ±2dB
LOW FILTER 18Hz
22 dBCut,±3dB
CHANNEL SEPARATION:
Volumecontrol- AtTAP.
Tone andBalancecontrols- MECHANICAL CENTER.
ModeSwitches- off(OUT)position.
SelectAUX.function.
Drive ONEAux.inputata timeforanoutputof60 Watts
(21.91V, R.M.S.- measuredacross8 ohmoutputloadresis-
tor). TerminateotherAUX.inputwith4.7K,5%loadresistor.
Measure UNDRIVEN outputinreferenceto DRIVEN output.
FREQUENCY
CROSSTALK
100Hz
-45 dB,MAX.
1kHz -45 dB,MAX.
10kHz -35 dB,MAX.
TRANSISTORLAYOUTDIAGRAM

BOTTOMCOVERREMOVAL
Metal bottomcoverissecuredbysix(6)brightscrewsandtwo
(2)blackscrews.Besuretoreplacelongerblackscrewsin
proper placewhenreplacingbottomcover.
Fiber bottomcoverissecuredbythree(3)brightscrewsplus
thelipofthemetalcover.
TOPCOVERREMOVAL
Cabinet topissecuredtothechassisbythree(3)screwsatthe
topofthe Jack Plateandsix(6)screwsalongtheouter edges
ofthecabinetbottom.Screwsat Jack Plate need onlybe
loosened slightlytoallowthemtoslipoutoftheslotsinthe
Jack Plate.Lift rear ofcabinetslightly,thenmoveto rear to
disengage escutcheon.Then lift cabinetstraightoffofchassis.
ESCUTCHEONREMOVAL
Tuning,VolumeandBalanceknobsaresecuredtocontrol
shaftsbyslottedsetscrews.TheOUTERBass,Mid-rangeand
Treble knobsarealsosecuredbysetscrews.The INNER Bass,
Mid-range andTrebleknobsareoftheslip-ontype.
TOREMOVEESCUTCHEON:
1. Removetopcover.
2. Remove rotary controlknobs.
3. RemovenutfromVolumeandTreblecontrolbushings.
4. RemovenutsfromHeadphoneandMicrophonejacks.
5. Removeonescrewfromeachtopinsidecornerofes-
cutcheon.
UPPERSWITCHPANELREMOVAL
1. Removetopcover.
2. Removeescutcheon.
3. Remove22-pin edge connectorfrom rear ofswitchpanel.
4. Removetwo(2)screwsfromendsofrowofpushbuttons.
5. Removescrewat rear ofpanelsupportbracketsecuring
bracket tochassis frame.
—UPPERSWITCHPANELREMOVAL (CONT'D)-
6. Moveswitchpanelto rear ofchassistoclearpushbuttons.
DIALLAMPREPLACEMENT
1. Removecabinettop.
2. Removesinglescrewfromcenteroflamppanel.
3. Movelamppanelslightlytosidetoreleasepanelfromplas-
ticretainingclips.
Usenumber259lamp,Sylvania part number 30-26288-1
for replacement.
METERLAMPREPLACEMENT
1. Removecabinettop.
2. Removescrewatcenterofsmalllamppanel.
Usenumber259lamp,Sylvania part number 30-26288-1
for replacement.
MULTIPLEXINDICATORLAMPREPLACEMENT
1. Removecabinettop.
2. Removebulbfromretaininggrommet.
Usenumber 2820-8 lamp,Sylvania part number
30-36246-1 forreplacement.
DIALPOINTERLAMPREPLACEMENT
1. Removecabinettop.
2. Removeescutcheon.
3. Removefibercoverheatstakedtotopofdialpointer
carriage.
Usenumber 0406 lamp,Sylvania part number 30-34803-1
for replacement.
DIALSTRINGING

SYLVANIA
PART
NUMBER
ALL
SILICON
TYPE APPLICATION
DC
CURRENT GAIN EMITTER-COLLECTOR (DRAIN-
SOURCE)
VOLTAGE(MAX.)
@25
DEG.C.AMBIENT
EMITTER-
BASE
(GATE
-
SOURCE)
VOLTAGE(MAX.)
@
25DEG.C.AMBIENT
MAXIMUM
POWER
DISSIPATION
@25
DEG.C.AMBIENT
IC (GATE
CURRENT)
MAXIMUM
BASING
13-18365-1 NPN
Q304, Q404 - Pre-Amplifier. 225-450 40V 4V 200mW 50mA
1, 2, 3
Q306, Q406 - Pre-Amplifier.
Q602, Q702 - VoltageAmplifier.
Q604, Q704 - FilterAmplifier.
13-23824-1 NPN Q8
- First FMIF. 27-275 35V 3V 180mW N/A
2,4,5,6
Q10 - Second FMIF.
Q12 - Third FMIF.
Q14 - Meter, AGCAmplifier.
13-26386-1 PNP Q30 - Mute Driver.
100-350 32V .56V 200mW 100mA 2,6
13-26386-2 PNP Q20 - AMConverter. 100-350 15V 4V 200mW 100mA 2,6
13-28392-1 NPN
Q812, Q912 - D.C.Amplifier. 90-270 45V 4V 500mW 500mA
2, 7,8
13-28393-1 PNP Q814, Q914 - D.C.Amplifier. 90-270 45V 4V 500mW 500mA 2,8
13-28654-4 N-CHAN.FET Q32
- MuteGate. N/A 30V 30V 200mW 30mA 9,
13
Q608, Q708 - AudioMute.
13-29033-3 NPN Q16 - NoiseAmplifier. 200-400 45V 4V 200mW N/A 2,6
Q24 - AMActive Filter, Meter Driver.
Q26, Q28 - MuteLevelDetector.
Q504 - RippleReducer.
Q808, Q908 - BiasRegulator.
13-33175-2 NPN
Q606, Q706 - VoltageAmplifier - Darlington. 7K-70K 40V 10V 310mW 200mA 2,6
13-34045-2 NPN Q22
- AM IF Amplifier. 4-18 12V 3V 250mW 30mA 6
13-34046-1 NPN Q502
- RegulatorAmplifier. 10-150 40V 4V 2.1W 1.5A 10
13-34367-3 PNP Q802, Q902 - CurrentSource. SeeBelow 50V 4V 300mW 100mA
2, 6,11
Q804 - Q806 - MATCHEDDifferentialInputPair
Q904 - Q906 - MATCHEDDifferentialInputPair
13-34369-1 PNP Q6 - FMOscillator. 20 20V .85V N/A N/A 4
13-34371-1 NPN Q810, Q910 - Pre-Driver. 90-270 110V 4V 500mW 500mA
2, 12
13-34375-1 N-CHAN.FET Q4 - FM Mixer. N/A N/A 25V 200mW 10mA 9,
13
13-34378-1 N-CHAN.FET Q2
- FMRF Amplifier. N/A ±20V -10V 250mW N/A
13, 14
13-34381-1 NPN
Q302, Q402 - Pre-Amplifier. 225-450 30V 4V 200mW 50mA 2,6
13-34940-1 NPN Q18 - AM RF Amplifier. 50-150 30V 4V 200mW 50mA 2,6
13-36440-1 NPN Q820, Q920 - PowerOutput. 25-100 100V 7V 150W 15A 15
13-36441-1 PNP
Q822, Q922 - PowerOutput-25-100 100V 7V 150W 15A 15
13-36444-1 NPN
Q816, Q916- Driver.
40-360 100V 7V 1.5W 1A 16
13-36445-1 PNP
Q818, Q918 - Driver.
40-360 100V 7V 1.5W 1A 16
13-34367-3 DCCurrentGain -BrownDot100-160
-RedDot150-210
-OrangeDot200-260
-YellowDot250-310
-GreenDot300-360
TRANSISTORBASINGDIAGRAMS

SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
CAPACITORS(AllinMFD,unlessotherwisespecified)
C2 42-34768-1 MainTuningGang
C3
330PF, Z5P
C4
330PF, Z5P
C6 330PF, Z5P
C8 330PF,Z5P
C10
10PF, NPO
C12
15PF, NPO
C14 18PF, N220
C16
.01, 100V
C18 3.3PF,NPO
C20
330PF, Z5P
C22 3.3PF,NPO
C24
.01, 100V
C26 .01, 100V
C28 42-34941-1 15PFTrimmer
C30
.01, 100V
C32
.01, 100V
C34
.01, 100V
C36
33PF, N150
C37
.01, 100V
C38
.02, 100V
C40
.02, 100V
C42
.01, 100V
C44
.01, 100V
C47
.02, 100V
C48
100PF, Z5P
C49
56PF, NPO
C50
.01, 100V
C52 330PF,Z5P
C54 41-32477-46
5/25V Electrolytic
C76 42-18146-1 CeramicTrimmer
C78
.01, 100V
C80
.01, 100V
C82
10PF, NPO
C84
.01, 100V
C86 100PF
C88
.05, 50V
C90 41-32477-46
5/25V Electrolytic
C92 41-32477-85 1/50V
C94
.05, 50V
C96 .01, 100V
C98
.01, 100V
C100
100PF, Z5P
C102
.05, 50V
C104 330PF, Z5P
C108 41-32477-33 10/15VElectrolytic
C114 4700PF,Z5U
C116
.05, 50V
C118 .02, 100V
C120
.01, 100V
C122
15PF, NPO
C124
.01, 100V
C126 40-10285-50 390PF- Polystyrene
C128
22PF, NPO
C132 41-32477-33 10/15VElectrolytic
C134
.05, 50V
C136
33PF, N150
C138
.05, 50V
C140 41-32477-86
2/50V Electrolytic
C142 180PF, Z5P
C144
560PF, Z5P
C146 270PF,Z5P
C148 .047
C150 41-32477-9 100/6VElectrolytic
C162
.01, 100V
C164
.01, 100V
C168 40-10285-50 390PF- Polystyrene
C170 41-32477-86
2/50V Electrolytic
C172 41-34346-2 .22/25VElectrolytic
C174 41-39148-64 .47/50VElectrolytic
C176 .033
C178 41-39148-64 .47/50VElectrolytic
C180 2,200PF,100V
C182 2,700PF,100V
SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
CAPACITORS(CONTINUED)
C184 41-32477-46 5/25V Electrolytic
C186 41-32477-46
5/25V Electrolytic
C188 .022(EarlyProduction)
C188 .018
C190 .022(EarlyProduction)
C190 .018
C192 .0047(EarlyProduction
C192 .015
C194 .0082
C196 .0047(EarlyProduction
C196 .012
C198 .0047(EarlyProduction
C198 .015
C200 .0082
C202 .0047(EarlyProduction
C202 .012
C204 .015
C206 .015
C208 41-32477-46
5/25V Electrolytic
C210 41-32477-38 250/15VElectrolytic
C212 .0027
C214 .0027
C220 41-32477-34 25/15VElectrolytic
C301 41-32477-34 25/15VElectrolytic
C302 41-32477-46
5/25V Electrolytic
C304
220PF, Z5P
C306 .039
C308 .15
C310 41-32477-37 100/15VElectrolytic
C312 41-32477-85 1/50VElectrolytic
C314 41-32477-85 1/50VElectrolytic
C316 220PF,Z5P
C318 41-32477-46 5/25V Electrolytic
C401 41-32477-34 25/15VElectrolytic
C402 41-32477-46
5/25V Electrolytic
C404
220PF, Z5P
C406 .039
C408 .15
C410 41-32477-37 100/15VElectrolytic
C412 41-32477-85 1/50VElectrolytic
C414 41-32477-85 1/50VElectrolytic
C416
220PF, Z5P
C418 41-32477-46
5/25V Electrolytic
C502 43-33245-5
.005, 150V
C504 43-98665-6 .005, 150VAC
C506 41-32477-95 500/50VElectrolytic
C508 41-32477-95 500/50VElectrolytic
C510 41-36437-1 5000/55VElectrolytic
C512 41-36437-1 5000/55VElectrolytic
C514 .01, 100V
C516 41-32477-93 100/50VElectrolytic
C518
.01, Z5U
C520
.01, Z5U
C522
.01, Z5U
C524
.01, Z5U
C526
.01, Z5U
C528
.01, Z5U
C530 .01, 100V
C532 41-32477-33 10/15VElectrolytic
C534 41-32477-33 10/15VElectrolytic
C536 41-32477-85 1/50VElectrolytic
C602 .047
C604 41-32477-85 1/50VElectrolytic
C605 41-32477-85 1/50VElectrolytic
C608 41-32477-86
2/50V Electrolytic
C610 .1
C612 .1
C614 1200PF,Z5P
C616 .1
C618
560PF, Z5P
C620 41-32477-47 10/25VElectrolytic
C622 .022
C624 .022
C626 .0047

SCHEMATIC
CODING SERVICE PARTNO. DESCRIPTION
CAPACITORS(CONTINUED)
C628 .0039
C630 .0039
C632 .0039
C634 .1
C636 41-32477-46
5/25V Electrolytic
C637
820PF, Z5P
C702 .047
C704 41-32477-85 1/50VElectrolytic
C705 41-32477-85 1/50VElectrolytic
C708 41-32477-86
2/50V Electrolytic
C710 .1
C712 .1
C714 1200PF,Z5P
C716 .1
C718 560PF, Z5P
C720 41-32477-47 10/25VElectrolytic
C722 .022
C724 .022
C726 .0047
C728 .0039
C730 .0039
C732 .0039
C734 .1
C736 41-32477-46
5/25V Electrolytic
C737
820PF, Z5P
C801 41-32477-85 1/50VElectrolytic
C802 41-32477-37 100/15VElectrolytic
C804 41-32477-90 25/50VElectrolytic
C805
.01, Z5U
C806 220PF, Z5P
C807 5000PF,100V
C808 33PF, N150
C809 5000PF,100V
C810 220PF, Z5P
C812
100PF, Z5P
E814
100PF, Z5P
C816 .1
C822 33PF, N150(EarlyProduction)
C822 5.6PF,N150(LaterProduction)
C901 41-32477-85 1/50VElectrolytic
C902 41-32477-37 100/15VElectrolytic
C904 41-32477-90 25/50VElectrolytic
C905
.01, Z5U
C906 220PF, Z5P
C907 5000PF,100V
C908 33PF, N150
C909 5000PF,100V
C910 220PF,Z5P
C912 100PF, Z5P
C914
100PF, Z5P
C916 .1
C922 33PF, N150(EarlyProduction)
C922 5.6PF,N150(LaterProduction)
RESISTORS(All1/4Watt,Carbon,5%,unlessotherwisespecified)
R2 560ohm
R4 10K
R6 3.3K
R8 1K
R10 4.7K
R12 270ohm
R14 22K
R16 10K
R18 10K
R20 22K
R22 330ohm
R24 1K
R26 100ohm
R28 5.6K
R30 270ohm
R32 180ohm
R34 820ohm
R36 15K
SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
RESISTORS(CONTINUED)
R38 220ohm
R40 390ohm
R42 15K
R44 820ohm
R46 37-14576-5 1KVariable- FMMeterZero
R48 1K
R70 22K
R72 10K
R74 2.2K
R76 100ohm
R78 56K,10%- EarlyProduction
R78 56K
R80 100K
R82 330K,10%- EarlyProduction
R82 330K
R84 10K
R86 120K
R88 100K
R90 91K
R92 130K
R94 47K- EarlyProduction
R94 56K
R96 33K
R98 1K
R100 10K
R102 22K
R112 1K
R114 22K
R116 82K
R118 1.8K
R120 560ohm
R122 10K
R124 22K
R126 120K
R128 4.7K
R130 33ohm
R132 150K
R134 33K
R136 470ohm
R138 3.3K
R140 10K
R142 150K
R144 100K
R146 100K
R148 10K
R150 18K
R152 4.7K
R162 35-36453-1 20K,2%
R168 37-14576-14 2KVariable- 19kHzAdjust
R170 10ohm,10%- EarlyProduction
R170 10ohm
R172 1K
R174 10ohm,10%- EarlyProduction
R174 10ohm
R176 2K
R178 10ohm
R180 3K
R182 20K
R184 2.2K
R186 12K
R188 10ohm
R190 3.3K
R192 10K
R194 37-14576-3 15KVariable- SeparationAdj.
R196 3.9K
R198 3.9K
R204 200ohm,5%-1/2Watt
R206 1K
R210 1.3K
R214 1.3K
R220 4.7K
R222 1.8K
R224 18K
R226 560ohm

SCHEMATIC
CODING SERVICE
PART NO.
DESCRIPTION
SCHEMATIC
CODING SERVICE
PART NO.
DESCRIPTION
RESISTORS(CONTINUED)
R228
15K
R230
1.8K
R232
8.2K
R234
180K
R236
120K
R238
68K
R240 820K
R242
68K
R244
1K
R246
100K
R248
150K
R304
1.5K
R308 220K
R310 82ohm,1/2
Watt - EarlyProduction
R310 82ohm
R312 15ohm
R314 22K
R316 1.8K
R318 68K
R320
4.7K
R322
220ohm
R324 470K
R326
47K
R328 820K
R330
2.7K
R332
560ohm
R334 470K
- EarlyProduction
R334
47K
R336
4.7K
R338
560ohm
R340
3.9K
R404
1.5K
R408 220K
R410 82ohm,1/2
Watt - EarlyProduction
R410 82ohm
R412 15ohm
R414 22K
R416 1.8K
R418 68K
R420
4.7K
R422
220ohm
R424 470K
R426
47K
R428 820K
R430
2.7K
R432
560ohm
R434 470K
- EarlyProduction
R434
47K
R436
4.7K
R438
560ohm
R440
3.9K
R502
3.3meg,10%- 1/2 Watt
R503 36-34727-36
4.7ohm,2W- W/W, NON-FLAMMABLE
R504
120ohm,10%-2 Watt
R505 36-34727-36
4.7ohm,2W- W/W, NON-FLAMMABLE
R506
68ohm,10%-1/2 Watt
R508
3.9K,10%-1/2 Watt
R510 1ohm,10%-1/2
Watt
R512 3.9K
R514 2.2K
R516 12K
R518
36-62454-37
33ohm,5 Watt
R522
1K
R524
1K
R528 220K
R530
1.8K
R532
47K
R534
1K
R600 37-34909-3
100K BalanceControl
R602
12K
R603
68K
R604
10K
R606 37-34289-8
100K DualVolumeControl
R608
120K
SCHEMATIC
CODING SERVICE PART NO.
DESCRIPTION
SCHEMATIC
CODING SERVICE PART NO.
DESCRIPTION
RESISTORS(CONTINUED)
R609
120K
R610 15K
R612 680ohm
R614
330K, 10%- EarlyProduction
R614
330K
R616 15K
R618 27K
R620
33K
R622
27K
R624
1.8meg,10%- 1/2 Watt
R626 5.6K
R628
10K
R630 37-36406-2
100K DualBassControl
R632
10K
R634
47K
R636 8.2K
R638
4.7K
R640 37-36406-2
100K DualMid-BandControl
R642
4.7K
R644
2.2K
R646 37-36406-1
100K DualTrebleControl
R648 2.2K
R650
3.3K
R652
2.7meg,10%- 1/2 Watt
R654
1meg
R656 10K
R658
33K
R702
12K
R703 68K
R704
10K
R708
120K
R709
120K
R710 15K
R712 680ohm
R714
330K, 10%- EarlyProduction
R714
330K
R716 15K
R718 27K
R720 33K
R722
27K
R724
1.8meg,10%-1/2 Watt
R726
5.6K
R728
10K
R732 10K
R734
47K
R736
8.2K
R738 4.7K
R742 4.7K
R744 2.2K
R748
2.2K
R750 3.3K
R752 2.7meg,10%- 1/2 Watt
R754
1meg
R756
10K
R758 33K
R802
100K
R804
47K
R806
680ohm
R808 680ohm
R809 2.2K
R810 10K
R811 2.2K
R812 2.2K
R814 3.3K- EarlyProduction
R814 6.8K,10%-1/2 Watt
R816 3.3K
R816 680ohm
R818 1.8K
R820
680ohm- EarlyProduction
R820 470ohm
R822 37-33717-6
330ohm Variable - Bias Adjust.
R824 39ohm
R826
39K
R828
2.2K

SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
RESISTORS(CONTINUED)
R830 IK
R832 1K
R834 2.2K
R836 39K
R838 100ohm,10%- 1/2Watt
R840 100ohm,10%- 1/2Watt
R842 36-34727-6 .22ohm,2W- NON-FLAMMABLE
R844 36-14764-20 .22ohm- 2 WattW/W
R846 36-14764-20 .22ohm- 2 WattW/W
R848 .22ohm,2W- NON-FLAMMABLE
(EarlyProduction)
.22ohm,2W- NON-FLAMMABLE
(EarlyProduction)
R848 36-14764-20 .22ohm- 2 WattW/W
R850 10ohm,10%- 1 Watt
R852 560ohm,10%- 1 Watt
R854 27K
R856 27K
R902 100K
R904 47K
R906 680ohm
R908 680ohm
R909 2.2K
R910 10K
R911 2.2K
R912 2.2K
R914 3.3K- EarlyProduction
R914 6.8K,10%- 1/2Watt
R916 3.3K- EarlyProduction
R916 680ohm
R918 1.8K
R920 680ohm- EarlyProduction
R920 470ohm
R922 37-33717-6 330ohmVariable- BiasAdjust.
R924 39ohm
R926 39K
R928 2.2K
R930 1K
R932 1K
R934 2.2K
R936 3 K
R938 100ohm,10%- 1/2Watt
R940 100ohm,10%- 1/2Watt
R942 36-34727-6 .22ohm,2W- NON-FLAMMABLE
R944 36-14764-20 .22ohm- 2 WattW/W
R946 36-14764-20 .22ohm- 2 WattW/W
R948 .22ohm,2W- NON-FLAMMABLE
(EarlyProduction)
R948 36-14764-20 .22ohm- 2 WattW/W
R950 10ohm,10%- 1 Watt
R952 560ohm,10%- 1 Watt
R954 27K
R956 27K
COILSANDT
L4 50-11378-5 3.3UH Filter
L6 50-34409-4 FMRFCoil
L8 50-34409-8 FMMixerCoil
L10 50-34409-7 FMOscillatorCoil
L12 22-28072-2 FerriteBead
L16 50-34939-6 27UHPeakingCoil
L18 50-34411-1 QuadratureDetectorCoil
L20 50-34939-6 27UHPeakingCoil
L22 50-34939-6 27UHPeakingCoil
L24 22-28072-2 FerriteBead
L26 50-34411-1 19kHzCoil
L28 50-18789-3
5.7MH Choke
L30 27-34851-1 AMRodAntenna
86-34774-1 RodAntennaHolder
86-34777-1 Rod-to-BracketAdaptor
L32 22-28072-2 FerriteBead
L34 50-34938-1 AMRFCoil
L36 50-34936-1 AMOscillatorCoil
L38 22-28072-2 FerriteBead
L40 22-28072-2 FerriteBead
SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
COILS& TRANSFORMERS(CONTINUED)
L42 22-28072-2 FerriteBead
L50 22-28072-2 FerriteBead
L52 50-36552-2 MultiplexFilter
L54 50-36552-2 MultiplexFilter
L56 50-36552-3 MultiplexFilter
L58 50-36552-3 MultiplexFilter
L502 22-28072-2 FerriteBead
L602 50-15318-19 820UHPeakingCoil
L604 22-28072-2 FerriteBead
L702 50-15318-19 820UHPeakingCoil
L704 22-28072-2 FerriteBead
L802 50-36391-1 AudioChoke
L804 22-28072-2 FerriteBead
L806 22-28072-2 FerriteBead
L902 50-36391-1 AudioChoke
L904 22-28072-2 FerriteBead
L906 22-28072-2 FerriteBead
T2 50-89962-6 FMBalun
T8 50-34937-1 455kHzAMTransformer
T10 50-34937-1 455kHzAMTransformer
T12 50-34952-1 FMMixer
T502 55-36551-1 PowerTransformer
SOLIDSTATEDEVICES
FL2 26-34156-101 CeramicFilter- BLACKDOT
26-34156-102 CeramicFilter- BLUEDOT
26-34156-103 CeramicFilter- REDDOT
26-34156-104 CeramicFilter- ORANGEDOT
26-34156-105 CeramicFilter- WHITEDOT
FL4 26-34156-101 CeramicFilter- BLACKDOT
26-34156-102 CeramicFilter- BLUEDOT
26-34156-103 CeramicFilter- REDDOT
26-34156-104 CeramicFilter- ORANGEDOT
26-34156-105 CeramicFilter- WHITEDOT
IC2 15-34452-1 IntegratedCkt.- FMLIM./DET.
IC4 15-36446-1 IntegratedCkt.- PLLMPX.DET.
IC502 15-34401-1 IntegratedCkt.- REGULATOR
L2 22-28072-3 FerriteBead
L12 22-28072-3 FerriteBead
L24 22-28072-2 FerriteBead
L32 22-28072-2 FerriteBead
L38 22-28072-2 FerriteBead
L40 22-28072-2 FerriteBead
L42 22-28072-2 FerriteBead
L50 22-28072-2 FerriteBead
L502 22-28072-2 FerriteBead
L604 22-28072-2 FerriteBead
L704 22-28072-2 FerriteBead
L804 22-28072-2 FerriteBead
L806 22-28072-2 FerriteBead
L904 22-28072-2 FerriteBead
L906 22-28072-2 FerriteBead
Q2 13-34378-1 FET-FMRFAmplifier
Q4 13-34375-1 FET-FMMixer
Q6 13-34369-1 FMOscillator
Q8 13-23824-1 FirstFMIF
Q10 13-23824-1 SecondFMIF
Q12 13-23824-1 ThirdFMIF
Q14 13-23824-1
Meter, AGCAmplifier
Q16 13-29033-3 NoiseAmplifier
Q18 13-34940-1 AMRFAmplifier
Q20 13-26386-2 AMConverter
Q22 13-34045-2 AMIFAmplifier
Q24 13-29033-3 AMActive
Filter, MeterDriver
Q26 13-29033-3 MuteLevelDetector
Q28 13-29033-3 MuteLevelDetector
Q30 13-26386-1 MuteDriver
Q32 13-28654-4 FET- MuteGate
Q302 13-34381-1 Pre-Amplifier
Q304 13-18365-1 Pre-Amplifier
Q306 13-18365-1 Pre-Amplifier
Q402 13-34381-1 Pre-Amplifier
Q404 13-18365-1 Pre-Amplifier

SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
SOLIDSTATEDEVICES(CONTINUED)
Q406 13-18365-1 Pre-Amplifier
Q502 13-34046-1 RegulatorAmplifier
Q504 13-29033-3 RippleReducer
Q602 13-18365-1 VoltageAmplifier
Q604 13-18365-1 FilterAmplifier
Q606 13-33175-2 Darlington- VoltageAmplifier
Q608 13-28654-4 FET- AudioMute
Q702 13-18365-1 VoltageAmplifier
Q704 13-18365-1 FilterAmplifier
Q706 13-33175-2 Darlington- VoltageAmplifier
Q708 13-28654-4 FET- AudioMute
Q802 13-34367-3 CurrentSource
Q804 13-34367-3 DifferentialInput- MATCHED
Q806 13-34367-3 DifferentialInput- MATCHED
Q808 13-29033-3 BiasRegulator
Q810 13-34371-1 Pre-Driver
Q812 13-28392-1 D.C.Amplifier
Q814 13-28393-1 D.C.Amplifier
Q816 13-36444-1 NPNDriver
Q818 13-36445-1 PNPDriver
Q820 13-36440-1 Output
Q822 13-36441-1 Output
Q902 13-34367-3 CurrentSource
Q904 13-34367-3 DifferentialInput- MATCHED
Q906 13-34367-3 DifferentialInput- MATCHED
Q908 13-29033-3 BiasRegulator
Q910 13-34371-1 Pre-Driver
Q912 13-28392-1 D.C.Amplifier
Q914 13-28393-1 D.C.Amplifier
Q916 13-36444-1 NPNDriver
Q918 13-36445-1 PNPDriver
Q920 13-36440-1 Output
Q922 13-36441-1 Output
SC2 1N295 Diode
SC4 1N295 Diode
SC6 13-17596-5 Diode- D6726
SC8 13-17596-5 Diode- D6726
SC10 13-17596-5 Diode- D6726
SC12 1N295 Diode
SC14 13-17596-5 Diode- D6726
SC16 13-17596-5 Diode- D6726
SC18 1N295 Diode
SC20 13-17596-5 Diode- D6726
SC22 13-17596-5 Diode- D6726
SC24 13-17596-5 Diode- D6726
SC26 13-17596-5 Diode- D6726
SC28 13-17596-5 Diode- D6726
SC30 13-33187-12 5VZener
SC32 13-17596-5 Diode- D6726
SC34 13-17596-5 Diode- D6726
SC36 13-17596-5 Diode- D6726
SC38 13-17596-5 Diode- D6726
SC502 13-17174-2 Diode
SC504 13-17174-2 Diode
SC506 13-34368-1 Diode
SC508 13-34368-1 Diode
SC510 13-34368-1 Diode
SC512 13-34368-1 Diode
SC514 13-17596-5 Diode- D6726
SC516 13-17596-5 Diode- D6726
SC518 13-17596-5 Diode- D6726
SC520 13-17596-9 Diode
SC522 13-17596-9 Diode
SC524 13-17596-9 Diode
SC805 13-17596-10 Diode
SC806 13-17596-9 Diode
SC808 13-17596-9 Diode
SC810 13-33187-16 27VZener
SC812 13-33187-16 27VZener
SC905 13-17596-10 Diode
SC906 13-17596-9 Diode
SC908 13-17596-9 Diode
SC910 13-33187-16 27VZener
SC912 13-33187-16 27VZener
SCHEMATIC
CODING SERVICE
PARTNO. DESCRIPTION
SOLIDSTATEDEVICES(CONTINUED)
SCR502 13-18924-3 SiliconControlledRectifier
86-14608-1 MicaInsulator,TO-3Transistor
72-34063-1 Socket,IC- 14PinStaggerBase
72-34063-2 Socket,IC- 16PinStaggerBase
72-28852-2 Socket- Transistor,In-line3 Pin
72-27200-7 Socket- Transistor,Large3 Pin
72-27200-5 Socket- Transistor,Small3 Pin
72-14607-2 Socket- Transistor,TO3 Case
MISCELLANEOUSPARTS
CB502 29-33346-18 CircuitBreaker- 3.5Amp
CB802 29-33346-17 CircuitBreaker- 2.8Amp
CB902 29-33346-17 CircuitBreaker- 2.8Amp
PL2 73-10302-39 AMAntennaConnectorKit
SK2 73-10302-37 AMAntennaConnectorKit(atJack
Plate)
AMAntennaConnectorKit(atJack
Plate)
SK502 73-34307-2 Aux.ACOutlet
SK504 37-34307-2 Aux.ACOutlet
SK506 73-34307-2 SwitchedAux.ACOutlet
SK508 73-26338-13 HeadphoneSocket
SK510 73-26338-13 MicrophoneSocket
SK514 73-34786-2 QuadPHONONO.1,PHONONO.2
INPUTSockets
QuadPHONONO.1,PHONONO.2
INPUTSockets
SK518 73-34786-1 DualAUX.INPUTSockets
SK520 73-34786-2 QuadTAPENO.1 RECORD/PLAY
Sockets
QuadTAPENO.1 RECORD/PLAY
Sockets
SK522 73-34786-2 QuadTAPENO.2 RECORD/PLAY
Sockets
QuadTAPENO.2 RECORD/PLAY
Sockets
SK528 73-34786-1 DualPREAMPOUTSockets
SK530 73-34786-1 DualPOWERAMPINSockets
SK550 86-14395-5 P.C.PanelEdgeConnectorKit
SW502 33-36719-1 CompleteFUNCTIONSwitchAsm.
33-35745-1 FMMUTESwitchSectiononly
33-35745-4 AUX.SwitchSectiononly
33-35745-5 PHONONO.1 orPHONONO.2
SwitchSectiononly
PHONONO.1 orPHONONO.2
SwitchSectiononly
33-35745-6 AMorFMSwitchSectiononly
33-35745-13 AUDIOMUTINGSwitchSectiononly
SW504 33-36403-1 CompleteMODESwitchAssembly
33-35745-1 ANYSingleSwitchSection
SW506 33-34917-2 ACPOWERSwitch
SW508 33-16011-7 MAGNETIC/CERAMICSlideSwitch
SW510 33-34953-2 MAIN/PQ4SpeakerSwitch
70-32627-2 SpecialMountingScrew- SW510
SW512 33-34953-2 REMOTESpeakerSwitch
70-32627-2 SpecialMountingScrew- SW512
SW514 33-16011-7 PQ4SPEAKERSlideSwitch
73-33071-41 ACPowerCord
27-34851-1 AMRodAntenna
86-34774-1 AMRodMountingBracket
86-34777-1 AMRodMountingBushing
73-34927-1 AntennaTerminal
86-34386-3 AntennaTerminalInsulator
74-36213-4 ChassisBase
70-98939-3 DialCordPulley,3/8"Dia.
70-98939-2 DialCordPulley,5/8"Dia.
77-41699-4 DialCordTensionSpring
86-34757-1 DialDrivePulley
30-26288-1 DialLamp,No.259
73-36258-1 DialLampMountingClip
70-99257-4 DialMountingClip
74-36257-6 DialOverlay
74-36218-2 DialPointer- Lighted
86-36227-1 DialPointerCarriage
86-36273-1 DialPointerFilter
30-34803-1 DialPointerLamp- No.0406
03-36263-1 DialTuningShaft& FlywheelAsm.
76-36254-1 DialTuningShaftBearing
70-14098-1 DialTuningShaftBearing- Nylon
81-36214-1 DialTuningShaftSleeveBushing
74-36407-1 JackPlate
83-34776-1 JackPlateJumper(PreampOut-
Amp. In)

SERVICE
PART NO. DESCRIPTION
SERVICE
PART NO. DESCRIPTION
MISCELLANEOUSPARTS(CONTINUED)
73-34959-1 JackPlatePanel(SpeakerConnect
-
Quad.)
JackPlatePanel(SpeakerConnect -
Quad.)
30-26288-1 Lamp
- Dial & Meter, No.259
70-26679-1 LampTerminal,
No.259 Bulb
30-34803-1 Lamp
- DialPointer, No. 0406
30-36246-1 Lamp
- StereoIndicator, No. 2820-8
70-16003-8 Lamp
Mtg. Grommet - No. 2820-8
Bulb
Lamp Mtg. Grommet - No. 2820-8
Bulb
86-14608-1 MicaInsulator,
TO-3 Transistor
72-34063-1 Socket,
IC- 14Pin StaggerBase
72-34063-2 Socket,
IC- 16Pin StaggerBase
72-28852-2 Socket
- Transistor,In-line 3 Pin
72-27200-7 Socket
- Transistor,Large 3 Pin
72-27200-5 Socket
- Transistor,Small 3 Pin
72-14607-2 Socket
- Transistor, TO-3 Case
25-34802-1 TuningMeter
- CenterTune (FM)
25-34802-2 TuningMeter
- SignalStrength
74-36311-1 TuningMeterFilter
30-26288-1 TuningMeterLamp, No.259
86-36232-1 TuningMeterLampHolder
70-26679-1 TuningMeterMountingClip
RS4744CABINETPARTSLIST
DESCRIPTION SERVICE
PART NO.
FMAntenna 27-14926-2
BEZEL
ControlKnob - Balance,Volume 74-34859-1
ControlKnob - Bass,Mid-Range,Treble(InnerShaft) 74-34862-1
ControlKnob - Bass,Mid-Range,Treble(OuterShaft) 74-34863-1
ControlKnob - Tuning 74-34861-2
CoverGlass 74-36242-1
Dial 74-34924-1
End Cap
10-36358-1
Headphone,MicrophoneJackMounting Nut
83-36201-1
MountingClip 77-36217-1
Mounting Nut- Volume & TrebleControls 70-32649-1
Pushbutton 74-34913-2
PushbuttonGuide - 1 Hole 74-34929-3
PushbuttonGuide - 6 Hole 74-34929-1
Spacer - Mounting 81-36348-1
ToggleSwitchCover 74-36233-1
Tuner 74-36418-3
CABINET
Assembly 10-36421-101
Vent 74-36419-1

R67ALIGNMENTPROCEDURE
GENERAL
Thisreceiverhas been factoryalignedwithprecisionequip-
ment.Thecircuitsarequitestable,andnotnormallysubject
tofrequency drift. Therefore,checkallcircuitsformalfunc-
tionsbeforeattemptingrealignment.RealignONLYwhenab-
solutelynecessary.
Maintain linevoltageat120V,60Hzduringalignment.
All RFshieldsmustbeinplaceduringalignment.
60 Watt, 8 ohm,non-inductiveloadsarerequiredforeach
channeloutputifspeakersystemsaredisconnectedduring
alignment.
ALWAYS KEEP INPUT SIGNALSATTHELOWESTUSE-
ABLELEVEL DURING ALIGNMENT- unlessa specific sig-
nal levelisindicated. Note thesignalgeneratoroutputattenua-
tor settingatwhichincreasedinputsignal does notincrease
outputsignal.Keeptheinputsignallevelwellbelowthispoint.
Set thetuningdialindicatoratzero(0)onthe logging scale
withmaintuning gang (C2)setatmaximumcapacity.Read-
justingtuningdialindicator after AMorFMRFalignmentwill
result inincorrectstationcalibration.
FM RFandIF sections mustbeproperlyalignedbeforebegin-
ningFMMultiplexalignment.
EQUIPMENT REQUIRED:
AM:
1. PREFERREDFORIF- Sweepgeneratorcapableof
455kHzsignals.
2. AMsignalgeneratorcapableof400Hz,30%modulatedac-
curate signalsfrom455kHzto1650kHz.
3. Generalpurposescope.
4. GeneralpurposeDCV.T.V.M.
FM:
1. PREFERREDFORIF- Sweepgeneratorcapableof88-
108MHz widebandsweep,aswellas narrow bandsweepat
106MHz.
2. FMsignalgeneratorcapableofaccuratesignalsfrom
10.6MHz - 10.8MHzand87to109MHz.(Modulated.)
3. Generalpurposescope,detectorprobe.
4. GeneralpurposeV.T.V.M.
5. Distortionanalyzeror400Hz high pass filter.
MULTIPLEXFM:
1. Multiplexgeneratorwiththefollowingcapabilities:
a.Pilot- onlysignal.
b. Standardmultiplexsignal,modulated.
c.Singlechannelmodulation.
2. Audiooscillatorcapableof 150mV., R.M.S.output(680
ohmload)at19kHzthrough28.194kHz.
3. Accuratefrequencycounter(19- 29kHz).
4. GeneralpurposeV.T.V.M.
5. Generalpurposescope.
AMALIGNMENT
STEP
TUNING
INDICATOR
SETTING
TEST EQUIPMENT HOOK-UP GENERATOR
FREQUENCY ADJUSTMENT
POINT
ADJUST FOR
Switchreceiveron- SelectAMfunctionandcheckfor+12VatpinsV andW.
1 PREFERRED.
Tuning gang
fully closed.
Radiate 455kHzsweepmodulatedsignalinto
tuner.
ScopetopinZB.
Wide Sweep. T8,T10
Symmetrical
IFPassboard.
NOTE: The preferred IFalignmentwillyielda betterAMdistortionfigure.
1 OPTIONAL.
Tuning gang
fully closed.
Radiate 455kHzmodulatedsignalintotuner.
ScopetoeitherL orR TapeRecord Jack.
455kHz- 30%
400Hzmodu-
lation.
T8, T10 Maximumre-
coveredaudio.
2
1400kHz
Radiate signalintotuner.
ScopetoeitherL orR TapeRecord Jack.
1400kHz-30%
400Hzmodu-
lation.
C28, C2H,C2K Maximumre-
coveredaudio.
3 600kHz 600kHz- 30%
400Hzmodu-
lation.
L36, L34,L30 Maximumre-
coveredaudio.
Reducesignallevelandrepeatsteps2 and3 untilmaximumsensitivityandcorrectdialcalibrationareachieved.
When correctlyaligned,thisreceiverwilltunethrougha signalfrom535kHzto1650kHz.

STEP
TUNING
INDICATOR
SETTING
TEST EQUIPMENT HOOK-UP
GENERATOR
FREQUENCY
ADJUSTMENT
POINT
ADJUST FOR
Switchreceiveron.SelectFMfunctionandcheckfor+12VatpinsW andY.
1
PREFERRED.
106MHz.
SweepgeneratortoFMantennaterminals.
ScopetopinB.Usedetectorprobe.
88-108MHz
sweep modu-
latedsignal.
C76, C2B,C2D
MAXIMUM re-
sponse at
106MHz mar-
ker.
1
PREFERRED.
106MHz.
SweepgeneratortoFMantennaterminals.
ScopetopinB.Usedetectorprobe.
Narrow sweep
down.
T12
Symmetrical
IFPassband.
2 90MHz.
SweepgeneratortoFMantennaterminals.
ScopetopinB.Usedetectorprobe.
Narrow sweep
down.
L10, L8,L6
MAXIMUM re-
sponse at
90MHz marker
Repeat steps 1 and2 untilindicateddialfrequenciesarecorrectat90MHzand106MHz.
1
ALTERNATE.
106MHz.
SignalgeneratortoFMantennaterminals.
ScopetopinB.Usedetectorprobe.
106MHz, 100%,
400Hzmodu-
lation.
C76.T12, C2B,
C2D.
MAXIMUM
response.
2 90MHz.
SignalgeneratortoFMantennaterminals.
ScopetopinB.Usedetectorprobe.
90MHz,100%,
400Hzmodu-
lation.
L10, L8,L6
Repeat steps 1 and2 untilindicateddialfrequenciesarecorrectat90MHzand106MHz.
3
106MHz.
SignalgeneratortoFMantennaterminals.
ScopetoL orR TapeRecord Jack.
106MHz, 100%,
modulation.
C76, C2B,C2D.
MAXIMUM
recovered
audio.
4
90MHz. Uselowlevelsignalsothat
noise ispresenton
recovered audio- REDUCE signalasrequired.
90MHz,100%,
modulation.
L10, L8,L6
Repeat steps 3 and4 untilmaximumsensitivitywithcorrectdialcalibrationareachieved.
Continuetoreducesignalleveltoachievemaximumsensitivity.
5
98MHz. SignalgeneratortoFMantennainputs.
ScopetoL orR TapeRecord Jacks.
98MHz,100%,
400Hzmodula-
tion.Use 100uV
signal.
L18
MAXIMUM
recovered
audio.
6
98MHz
As above- usedistortionanalyzeror400Hz
high pass filter.
98MHz,100%,
400Hzmodula-
tion.Use 100uV
signal.
L18
MINIMUMdis-
tortion.
7
98MHz
As above- usedistortionanalyzeror400Hz
high pass filter.
98MHz,100%,
400Hzmodula-
tion.Use 100uV
signal.
R46 (Meter
Zero)
Centered de-
flection.
8
98MHz
As above- usedistortionanalyzeror400Hz
high pass filter.
Increasesignal
levelto 1000uV.
L26 - "S"
meter coil.
MAXIMUM
"S" meter
reading.
9
98MHz
As above- usedistortionanalyzeror400Hz
high pass filter.
Reducesignal
levelto 1.8uV.
T12
MINIMUM
noise onpeaks
ofrecovered
audio.
When correctlyaligned,thisreceiverwilltunethrougha signalfrom87.5MHzto108.5MHz.

MULTIPLEXALIGNMENT
STEP
TUNING
INDICATOR
SETTING
TEST EQUIPMENT HOOK-UP
GENERATOR
FREQUENCY
ADJUSTMENT
POINT
ADJUST FOR
Switchreceiveron.SelectFMandSTEREOfunctions.EnableMUTEswitch.Checkfor+12VatpinsW andY.
1
Tunereceiverto
generator.
MultiplexgeneratortoFMantennaterminals.
FrequencycountertopinG.
Use1uV input
signal.
R168 (19kHz
Adj.) *SEE
NOTE.
Frequency
readingof
19kHz, ±10Hz
at pinG.
2
Tunereceiverto
generator.
MultiplexgeneratortoFMantennaterminals.
ScopetoR TapeRecordJack.
Disconnect counterfrompinG.
1000UV, L.
onlystereo
signal.
R194 (separa-
tion).
MINIMUM sig-
nal onRIGHT
channel.
3
Tunereceiverto
generator.
MultiplexgeneratortoFMantennaterminals.
ScopetoL TapeRecordJack.
AudiogeneratortopinFLthrough680ohm
load- COUNT generatorfrequency.
luV input
level.
19,607Hz at
150mV,
R.M.S.
(COUNTED).
L54
MINIMUM
19,607Hz at
LTapeJack.
4
Tunereceiverto
generator.
Multiplexgenerator- asabove.
ScopetoR TapeRecordJack.
AudiogeneratortopinFR. As above. L52
MINIMUM
19,607Hz at
R TapeJack.
5
Tunereceiverto
generator.
Multiplexgenerator- asabove.
ScopetoR TapeRecordJack.
AudiogeneratortopinFR.
28,194Hz at
150mV
R.M.S.
(COUNTED).
L56
MINIMUM
28,194Hz at
R TapeJack.
6
Tunereceiverto
generator.
Multiplexgenerator- asabove.
ScopetoL TapeRecordJack.
AudiogeneratortopinFL.
As above.
L58
MINIMUM
28,194Hz at
LTapeJack.
19kHzADJUSTMENTTABLE
Intheunlikelyeventthattheproper19kHzfrequencycannot
beachievedatPinG,thefollowingcircuitchangesmaybe
made:
ThefrequencyatPin"G"shouldbecountedwithR170,
R174 andR178connectedinthecircuitandwithR168
(19kHzAdj.)atminimumresistance(highestfrequency).
IFFREQUENCYIS
EQUALTO,OR
GREATER THAN
BUTFREQUENCYIS
EQUALTO,OR
LESS THAN
THEN REMOVE
RESISTORSLISTED
ANDRESETR168.
20,224Hz 21,171Hz R170
21,172Hz
22,120Hz R174
22,121Hz 23,059Hz R178
23,060Hz 24,007Hz
R170, R178
24,008Hz 24,947Hz R174, R178
24,948Hz
26, 181Hz
R170, R174,R178

PARTSIDENTIFICATION(CONTINUED)
SWITCHPANEL(CONTINUED)

PARTSIDENTIFICATION(CONTINUED)
SWITCHPANEL(CONTINUED)