JBL 6810 User manual

Professional
Video
Products
FIELDSERVICEGUIDE
MODEL6810AND6820
VIDEOPROJECTOR
CAUTION!
USEANISOLATIONTRANSFORMERWHENSERVICINGTHIS
JBLInternational
8500BalboaBlvd.
Northridge,CA91329
[phone]
SAFETYNOTICE!
Rev.4.28
JBL
ANYPERSONATTEMPTINGTOSERVICETHISCHASSISMUST
FAMILIARIZEHIMSELFWITHTHECHASSISANDBEAWAREOF
THENECESSARYSAFETYPRECAUTIONSTOBEUSEDWHEN
SERVICINGELECTONICEQUIPMENTCONTAININGHIGH
VOLTAGES.

SubjectCONTENTPage
ServiceandSafetyPrecautions3
Introduction
UsingtheTroubleshootingCharts3
Non-ServiceableAdjustments3
TheTwoGroundSystem4
IsolationProtection4
TVSystemOverview4
AdjustingtheNewCRT4
TS10PTuningSystemBlockDiagram5
6810SignalRowBlockDiagram6
Electro/MechanicalFocusingProcedure7
AdjustmentProcedures7
NonserviceableAreas7
HorizontalOscillator7
AGC7
VerticalHeight7
ComputerTextCentering7
WhiteBalance/GrayScaleTracking8
VideoProcessorPanel8
LuminancePeakingControl8
TroubleshootingtheChassis8
PowerSupplyPanel9
DeflectionPanel9
AllBandTuner10
TS10TunerInterfacePanel10
TS10PController11
Audio/VideoInput/OutputModule11
Stereo/SAPDecoderModule11
SoundProcessingModule12
StereoPowerAmplifier12
VideoProcessorPanel13
CombFilterModule13
CRTDrivePanels14
HorizontalDelayModule14
ConvergencePanel14
TroubleshootingtheChassis
DeadSet- Chart 1 15
NoAudio,NoVideo- Chart2 15
NoAudio- Chart3 15
NoAudio,NoVideo- Chart4 16
NoVerticalDeflection- Chart5 16
PictureRolls- Chart6 16
SetShutsDown- Chart7 17
TunerVoltages- Chart8 17
OneColorMissing- Chart9 17
ColorBandAtBottomOfPicture- Chart1018
SetDoesNotConverge- Chart1118
PincushionErrorTop/BottomAndSides- Chart1219

Servicing AndSafetyPrecautions
1. Becarefulofshockhazardwhenoperatingprojector with thecoveroff.
2. Useanisolationtransformerwhen servicing theunitto protect boththesetandthe test
equipmentelectronics.
3. Always wearsafetyglasseswhenservicing CRT's.
4. Donotremovesolid state devicesfrom circuits whilethesetisturnedon.
5. Donot operate thesetforlongperiodsoftimewhentheshutdown circuit defeated.
6.Becertain that eachvoltage test is made fromthecorrectground.
7. Becertain that all grounds,groundstraps,andwiresareproperlyconnectedto
protect thesetelectronicsandtheuserfrom shock.
8. Always checkforshockhazardaftercompletionofchassisrepairs.Referto Service Manual
for proper "SafetyCheck"procedures.
Introduction
This Service GuideincludesinstructionfortheModel6810Projection TV circuitry. Itincludes
adjustmentproceduresplussymptomandtroubleshootingchartstolocateeitherfaultypanels,
socketedsolid state devices,ormodules.A signal flow blockdiagramandpanel/modulelayout
diagramsareincluded.
Before exchangingpanelsormodules,itisimportanttomakesomepreliminarychecks.These
checksinclude:operationofthecustomercontrols,cableconnectionsandplugseating,acces-
sory connection,antennaconnections,andoperational mode checks.On sets usingon-screen
characters,observationofthescreenisveryusefulintroubleshooting.If these checksdonot
locatetheproblem,thentheCovermustberemovedanda visual inspection made of all wiring
harnessesandconnectors. Look forbroken wires, overheatedcomponents,openfuses,etc.If
the visual checkandpreliminaryinspection does notlocatethemalfunction,usethe
TroubleshootingCharts,listedbysymptomand page numberintheSymptomIndex.
NOTE: Useanisolationtransformerwhentroubleshootingthischassis!The
unithastwogroundsystems.Itisveryimportanttousethecorrectgroundfor
test equipmentwhenmakingmeasurements.
Non-serviceableAdjustments
The followingnon-serviceableadjustmentsare critical andshouldnotbeadjustedinthe field:
RP1 B+ControllerandRP2HVAdjustonthePowerSupplyPanel,and RP1 OverVoltage
SenseontheDeflection Panel. (Theseadjustmentsaresealedtopreventmis-adjustment.)
R7AGC Delay IF Module
LI 31.5kHzOsc Horiz. Osc.Module
RP1RGB Centering Horiz. Osc.Module
RP2 Height Horiz. Osc.Module
RP3V. Linearity DeflectionPanel
C70 Color Osc. VideoProcessor
RP1 Luminance PeakVideoProcessor
RP4 SubBrightnessVideoProcessor
RP5 PeakContrastVideoProcessor

UsingtheTroubleshootCharts
Whenusing theTroubleshootingCharts,determinethesymptombyscreenobservationand
controlaction.ChecktheSymptomIndexandfind thesymptomthatmostcloselydescribesthe
problem. ThepageindicatingthatkindofproblemhastheTroubleshootChartdealingwithit.
theTroubleshootChartslistadjustments,panelsandmodulestobechecked.Ifacheckresults
ina symptomchange,locatethenewsymptomintheIndexandfollowthechartdirections.
TwoGroundSystem
ThetwogroundsystemusedonthePowerSupplyPanelandDeflectionPanelare"AC"or
"Hot"groundand"Signal"or"Cold"ground.TestpointsTP3andTP9aremeasuringequip-
mentgroundsusedwhencheckingaclineconnectedcircuits."Signal"or"Cold"groundtest
pointsTP1andallshieldingonthesignalplugstopanelsandmodulesareusedfortestequip-
mentgroundswhenmeasuringcircuitsconnectedto"Signal"ground.
Isolationbetween"Hot"groundand"Cold"groundisdevelopedbyPowerTransformerTl,HV
TransformerT4,andOpticCoupler IC1 onthePowerSupplyPanel.HorizontalDriveTrans-
formerTlandHorizontalOutputTransformerT2providetheisolationontheDeflectionPanel.
IsolationProtection
ItisimperativeanIsolationTransformerbeusedonthetwo-groundsystemtoprotectthetest
andmeasuringinstrumentsaswellasthesetelectronicsfrom mis-polarizedaclinecordplugs.
TVSystemOverview
WhenthePowerplugisconnectedtotheacline,Stand-byvoltageisfedtotheTS10PCon-
troller,Figure1, and regulatedto5VdctokeeptheMicrocomputeralive.A Power-Onkey
pressattheRemoteTransmitteroron-setKeyboardtunesthesettoChannel3,selectsthe
AntennaRFInput,andplacestheaudiosystemintheMonauralmode.TheTS10PController
displayson-screengraphicstoidentifythemode.TheMicrocomputeracceptsalldatafromthe
keyboard.Ifthechanneldataisincorrect,theTS10Pdisplayblinkssixtimesandontheseventh
blinkrevertstothepreviouschannelnumber.Incompletechannelnumbersreverttotheprevious
channeliftheseconddigitisnotenteredwithineightseconds.Zerocancellationisusedonall
numbersbelow10.Volumeiscontrolledin64steps.Soundismuteduntilthechannelistuned
andwhentheMutekeyispressedontheRemoteTransmitter.PresstheRemoteTransmitter
MutebuttonorVolumeUpbuttontoun-mute.
Figure2 showsthePanelandmodulefunctions,interconnectcables,plugs,andjacks.The
heavierlinesidentifythesignalflowfromtheRFSwitchertotheStereoSpeakerterrninalsand
theRed,GreenandBlueCRTs.Switchingsignals,controlvoltages,andotheroperationalvolt-
agesareshownwithlighterlines.
Adjustinga newCRT
AfterinstallinganewCRT,checkthepositionofthenewCRTrasteragainsttheCrosshair
patternoftheothertwoCRTsusing thefollowingprocedure.
1. Placethealikemagneticringtabstogether.
2. Rotatetheyoketopositionthecrosshairpatternstogether.Ifthepatternsdonot
match, adjustthemagneticringtabstopositionthecrosshairpointstogether.
3.UseaCrosshatchpatterngeneratortochecktheoverallconvergence,andtouch
upconvergenceifnecessary.

Figure1 - TS10TuningSystemBlockDiagram

Figure2-SignalFlowBlockDiagram

Electro/MechanicalFocusingProcedure
1. SettheBrightness,Picture,andColorcontrolsforbestpicture.
2. Loosenthewingnutsoneachlens.
3.AdjusttheelectricalFocuscontroltoeachCRTforsharpestscanlinesviewedon
thetubefaceplatethroughthelens.
4. Mechanicallyfocuseachlensforsharpestpictureviewedonthescreen.
AdjustmentProcedures
Non-serviceableAreas
Thenon-serviceableareasfoundonthePowerSupplyPanelandDeflectionPanelarecircuits,
componentsandcontrolswhicharenottoberepairednoradjusted.Shouldamalfunctionoccur
intheseareas,thefaultisrepairedbyreplacingthepanel.
HorizontalOscillator
The31.5kHzOscillatorontheHorizontalOscillatorModuleisadjusted as follows:
1. Jumperthetwopinsat TP301. Thepicturewillrollverticallyandhorizontally.
2. AdjustoscillatorcoilLIuntilthepicturerollsslightlyorstands still.
3.Remove the jumperfrom TP301. Thepicture shouldlock.Ifthepicturedoesnot
lock,checkthersymptomindexforthetroubleshootingchartdescribingthecondition
viewedonthescreen.
AGC
TheAGCcontrolislocatedinsidetheIFModule.Itisaccessedthroughtheholeinthetopof
themoduleidentifiedasDelayedAGC.Use a plastichexalignmenttooltoreachtheAGC
controlshaft.
1. Tunethesettoa strongTVchannel.
2. Rotatethecontrolwhilewatchingthescreen.
3.Atthepointwhenthepicturebecomesnoisy,rotatethecontrolintheopposite
directionuntilthenoisedisappears.
4. Checktheotherstrongchannelfornoise,andreadjustAGCasrequired.
VerticalHeight
TheVerticalHeightcontrol(RP2)islocatedontheHorizontalOscillatorModule.TheVertical
Linearitycontrol(RP3)islocatedbelow RP1 ontheHorizontalOscillatorModule.
1. WithaCrosshatchorpictureadjusttheHeightcontroltofilloutthepicturearea.
2. AdjusttheVerticalLinearitycontroltocorrectnonlinearityinthepatternorpicture.
3.Readjustbothcontrolsasrequiredforbestpicturelinearity.
ComputerTextCentering
Ifthecomputertextareaisoff-center,lifttheconvergenceboardtoaccesstheHorizontal
OscillatorModule.TheRGBCenteringadjustment(RP1)islocatedonthelowerright.
1. PlugthecomputercableintotheRGB"D"Connector,locatedintheJackPlate.
2. SelectthecomputerinputwiththeRGBbuttononthecustomercontrolpanel.

3.Observetheviewingscreenandadjust RP1 tocenterthetextontheraster.
WhiteBalance/GrayScaleTracking
TheCRTDriveControls(RP1ontheCRTDrivePanels)andScreenorG2Controls(onthe
G2/FocusAssemblybetweentheredandgreenlenses)areadjustedusingthefollowingsteps.
1. SetthePicture,Sharpness,andBrightnesscontrolsatmidrange.
2. TurntheColorfullydown.
3.SetallCRTDriveControlstomaximum(CW)andtheScreenstominimum(CCW).
4. Tunethesettoa snowychannel.
5.MoveServicePlugJ216ontheDeflectionPaneltotheserviceSet-Upposition.
6.AdjusteachG2controltoobtaina faintline(whichappearswhitewithallthreecolors).
7.ReturntheServicePlugtothenormalposition.
8.Checkgrayscaletracking.AdjusttheBrightnesscontrolfrom maximumto
minimum,watchingforpossiblecolorshift.
9.Re-adjusttheCRTDrivecontrolsforbesthightolowlightgrayscale.
VideoProcessorPanelControls
1. Setallcustomercontrolstomidrange.
2. Inserta barpatternfrom anNTSCgenerator.
3.SetRP5(Peakcontrast)tofullCCW.
4. AdjustRP4(Subbrightness)untilthelastlineisblack.
5.AdjustRP2(Blacklevel)untilthefirstbariswhite.
6.AdjustRP3(Subpicture)fora sharp,uniformdivisionbetweenbars.
7.View a picturewithbrightwhitehighlights.Checkforbloominginthewhiteareasr
orrasteredge.ReadjustRP2and/orRP4untilbloomingdisappears.
NOTE: If a barpatterngeneratorisnotavailable,theadjustmentsmaybemadeonahighwhite
levelpicture.BeginwithRP2andRP4setfullyCCW.RP5shouldalwaysbesetfullyCCW.
SetRP3to75%rotationtowardsCCW.BeginrotatingRP2CWuntilminimumbloomingisthe
whiteareasisobserved.Iftheoverallpicturebrightnessisbelowproperviewinglevelbefore
thisoccurs,turnRP4CWslightlyandbeginprocedureagainwithRP2fullCCW.Repeatuntil
picturehasbrightwhites,properblacklevelandacceptablecontrastwithnobloomingorraster
bounce.
LuminancePeakingControl
TheLuminancePeakingadjustmentismadeusingtheinternalCrosshairpatternandthetuneron
alivechannel. RP1, PeakLuminancecontrol,islocatedontheVideoProcessorPanelnextto
theCombFilter.
1. SetthePicturecontroltomidrange.
2. SettheBrightnesscontroltomidrange.
3.SettheSharpnesscontroltofullCW.
4. Adjust RP1 untilminimumringingoccursattheleftedgeoftheverticalline.
NOTE: Thesetroubleshootingchartscannotbeallinclusive.Theyaremeanttobea service
guideonly.Thereareseveralsafetyand/orprotectioncircuitsinthesetwhich,if activated, can
resembleormasktheactualdefect.Onesuchcircuitistheverticalfailsafecircuitwhichcan
causea lossof video. Useoftheservicemanualwillbeneededtoresolvethistypeofproblem.

SymptomPage
DeadSet- Chart 1 18
NoAudio,NoVideo- Chart2 18
NoAudio- Chart3 18
NoAudio,NoVideo- Chart4 19
NoVerticalDeflection- Chart5 19
PictureRolls- Chart6 19
SetShutsDown- Chart7 20
TunerVoltages- Chart8 20
OneColorMissing- Chart9 20
ColorBandAtBottomOfPicture- Chart1021
SetDoesNotConverge- Chart1121
PincushionErrorTop/BottomAndSides- Chart1222
NOTE: Thesetroubleshootingchartscannotbeallinclusive.Theyaremeanttobea
serviceguideonly.Thereareseveralsafetyand/orprotectioncircuitsinthesetwhich,
ifactivated,canresembleormasktheactualdefect.Onesuchcircuitisthevertical
failsafecircuitwhichcancausea lossofvideo.Useoftheservicemanualwillbe
neededtoresolvethistypeofproblem.

r SupplyPanel DeflectionPanel
ThePowerSupplyPanel,Figure 3,isnottobe repaired or
In.theNON«
dGVlf6S>and Servlceadjustments
ntheNONSERVICEareasaresealedbymetalcovers.However
herearesomechecksintheTroubleshootingChartsthatshow
if the panelneedsreplacing.ChecktheSymptomIndex
RYt
POWER
RELAY T1
POWER
TRANSFORMER
NONSERVICEABLE
AREA
Figure3—PowerSupplyPanel
POWER SUPPIV PAKJP|
VOLTAGES
TEST POINTS
' 12VDC STAND-BY
J106-1
4
24VDC START-UP
TP2, J107-7
* 305VDC
TP6
130VDC
TP7. J108-6
6.8VDC
TP5
TheDeflectionPanel,Figure 4, uses one socketed ICinthe
verticalcircuit.IC3 isthe VerticalRampAmpwhichdrives hP
VerticalWaveformAmpIC4ontheConvergencePane?Should
replaced"eCeSSary °'her
C"CU,,S- ,he
DeflectionPanel is
NONSERVICEABLE
AREA
Figure 4— DeflectionPanel
DEFLECTION PANEL
VOLTAGES TESTPOINTS
24VDCSTART-UP J215-2.J217-11
130VDC
J210-1. TPL 1
16VDCDERIVED TP12.J208-2
-16VDCDEIIVED TP13.J208-!
J206-8
24VDCDERIVED TP14.J206-7
J204-1. J205-4
J215-3
13VDCDERIVED TP15.J206-1
J205-6.J207-5
J204-2. TP11
J203-3.J202-5
200VDCDERIVED TP16.J205-1
45VDCDERIVED
TP17
40VDCDERIVED J204-4
2LOVDCDERIVED J215-8
LOVDCDERIVED J108-3
IC3
RAMP AMP
RP3
V. LINEARITY
RP1
OVERVOLTAGE
SENSE

Ai nd Tuner
TheAllBandTuner,Figure5 , isinterconnectedtotheCon-
trollerbyplugsP/J21andP/J22.Therearenoserviceadjust-
mentsorplug-incomponents.Malfunctionsareservicedby
replacingthetuner.Refertopage42forP/J21and P/J22
voltages.
Figure5 —AllBandTuner
TS10P Tuner Interface Panel
Lo6 16ViSes
ontheTS10PInterfacePanel,Figure6
are. IFModule,Controller,andSerial/ParallelConverterIC1
SWorv InnnTinH^!?9
V0'ta9eS^ Se'eCtingRFandAcces"
soryInputs,andsoundprocessingmodes.Malfunctionsinthe
remainingcircuitsareservicedbyreplacingthepanel.
TP10P
CONTROLLER
SERIAL TO
PARALLEL
"CONVERTER
IC1
IF MODULE
Figure6 - TS10PTunerInterfacePanel
IF
OUTPUT
PRESCALER
OUTPUT
RF
OUTPUT

TS10PController
Theplug-indevicesontheTS10PController,Figure7 , are:
MicrocomputerIC1000,CITACIC1200,andMicrocomputer
IC1400.TheControllerisreplacedifa malfunctionisinthe
remainingcircuitry.
MICROPROCESSOR
IC1000
CITAC
IC120Q
GRAPHICS
MICROPROCESSOR
IC1400
IC1500
GRAPHICS
GENERATOR
Audio/Video Input/OutputPanel
Video,Sync,Audio,andRGBVideoswitchingisdonebyfive
socketedBilateralSwitchICs.A sixthdevice,notsocketed,is
theSyncCorrectorIC6.MalfunctionsintheSyncCorrectorand
othernonsocketeddevicecircuitsareservicedbypanel
replacement,Figure8 .
VIDEOSW.
AUDIO SW.
IC2 i
SYNC SW.
R.VIDEOSW.
AUDIO SW.
IC3
SYNC
CORRECTOR
IC6
VIDEOSW.
R.VIDEOSW
AUDIO SW.
IC1
VIDEOSW.
CROSSHAIRSW.
B.VIDEOSW.
G.VIDEOSW.
IC4
AUDIO SW.
G.VIDEOSW.
B.VIDEOSW.
IC5
Figure7 — TS10PController Figure8 —Input/OutputPanel

Stereo/SAP DecoderModule
StereoPowerAmplifier
Allsolidstatedevices are nonsocketed.Monaural,Stereo or
SAPaudiomalfunctions are serviced by DecoderModule
replacement,Figure 9 .
Allsolidstatedevices onthe StereoPowerAmp are nonsock-
eted. Anymalfunctionisserviced by replacingtheStereoPower
Amp.
L-RLEVEL
R5Q
L•RLEVEL
R5S
8kHz ADJ.
R83
SoundProcessingModule
TheSoundProcessingModule,Figure 10, plugs intotheStereo
Power Ampandhasone SoundProcessing IC socketed.This
module is serviced by replacingSoundProcessingchip IC2or
SoundProcessingModule.
SPEAKER
JACK
J301
Figure 11— StereoPowerAmplifier
AC LINE
INPUT
J401
Q203, Q204
MUTE
FETS
SOUND
PROCESSING
MODULE
INPUT JACK
J201
TONE/
VOLUME
CONTROL
IC201
Figure 10— SoundProcessingModule
SAPLEVEL
R26
Figure 9 —Stereo/SAPDecoderModule
.osc. ADJUST
R3
.CURRENT ADJ.
R74
SOUND PROCESSING
IC2

VIdrocessorPanel
ThesocketedICsare:VideoProcessorIC2,Figure12,RGB
ProcessorIC4,SandCastleGeneratorICSandRGBBufferIC6.
TheseICsarereplaceable.Malfunctionsintheremaining cir-
cuitsareresolvedbypanelreplacement.Therearefivecontrols
thatadjustthecompositevideosignalreferencesandlimits.
ThesecontrolsarereferredtointhePanelandModuleAdjust-
mentproceduresontheContentpage.
CombFilterModule
TheCombFilterisa module,whichisnonserviceable.Ithasno
socketedsolidstatedevices,andallcontrolsarefactory
adjustments.Shouldthismodule require servicing,itisdone
witha replacementmodule,Figure13.
RP1
CHROMA
ADJUST
IC1
COMB
FILTER
LUMINANCE
ADJUST
RP2
Figure13—CombFilterModule
RP3
VERTICAL
DETAIL
IC2
VIDEO
PROCESSOR•
RP2—•
DONOT
ADJUST
RP3
IC6
RGB—
BUFFER
IC5
SANDCASTLE
IC4
RGB
PROCESSOR
RP1
LUMINANCE
PEAK
RP4
"SUBBRITE
RP5
"PEAKCONTRAST
Figure12—VideoProcessorPanel

CrDrivePanels
TheRed,Green,andBlueCRTsaredrivenbyidenticalpanels,
Figure14.AllsolidstatedevicesontheCRTDrivePanelsare
nonsocketed.Malfunctionsonthesepanelsareservicedby
panelreplacement.
ConvergencePanel
AllICsaresocketedonthispanelexcept1C10throughIC15.
MalfunctionscreatedbycircuitryotherthanICsareservicedby
panelreplacement,Figure16
02
VIDEO-
AMP
03
VIDEO•
AMP
01
CRTDRIVER
-Q4
CRTDRIVER
RP1
CRTDRIVE
Figure14—CRTDrivePanel
HorizontalDelayModule
TheHorizontalDelaymodule,Figure15,hasallnonsocketed
solidstatedevices.Malfunctionsareservicedbyadjustmentor
modulereplacement.
Figure15—HorizontalDelayModule
GRN. T/BGRN.REDBLUEBLUE
HORIZ.PIN-HORIZ.HORIZ.REDVERT.HORIZ.VERT.
OUTCUSHIONOUTOUTOUTOUTOUT
IC14IC3IC1SIC12IC13ICtOIC11
IC9IC8IC2IC5HORIZ.IC4
PULSEZEROTRAPSIDEWAVEFORMVERTICAL
GENERATORCROSSINGKEYSTONEPIC.AMPWAVEFORM
DET.GEN.GEN.IC1AMP
Figure16—ConvergencePanel

Chart 1
Symptom:
DeadSet
CheckPowerSupply
J106-112VStand-By
Pret*PowerOn
Button.
CheckPowerSupply
PanelQ1,02,03.
Note:
TheSUrl-Up24Vla
PresentNormally
For2 Seconds.Then
24VStart-UpIsShut
DownByEither
Derived24VFrom
DeflectionPanelOr
ItsTimingCircuit
R5, CIO.
CheckACInter-
connectFusePower
SupplyTransistorT1,
ThermalBreaker®
CheckTSCon-
trollerIC1100,
IC1000.
CheckHorizontal
OscillatorIC1.IC2
OrReplaceModule.
CheckDefection
PanelOS.09,010
OrReplacePanel.
CheckTSCon-
trollerIC1000,QS20,
0522OrReplace
TSController.
Chart2
Symptom:
NoAudio,No
Video
Check
TunerInterlace
Panel,
Check:Deflection
PanelTP15,018,
CS2 L4, C53.
MeasureTuner
InterlacePanel
TI'B
Check:Deflection
PanelJ204-4,C57,
C5S, R82.
CheckTunerPlugs
P21AndP22.
UseTunerPlug
Charts.
SubTuner.
ReplaceTuner.
Chart3
Symplon:
NoAudio
PlugVoltOhm-
meterIntoTuner
InterlacePanel
Note:
1. TuneToA LiveChannel
2. UseA VoltOhmmeterWith
AnACOutputMeasuring
Ability.
IFModuleSound
DetectorIsOk
ReplaceIFModule
AudioCircuits
AreOk
CheckAudioSignal
AtI/OPanel
J7I2-3.1WithAC
OutputMeier.
CheckSlereo'SAP
DecoderPtugs
P25-2.3.OrReplace
Stereo/SAPDecoder
CheckAudioSignal
AtSoundProcessing
Module.J1104-1.4
WithACOutput
Meter.
CheckI/OPlugP718.
Butlers Q19.Q20.
AndIC3.OrReplace
I/OPanel
CheckAudioSignal
AtSoundProcessing
ModuleP1101-3.6
ReplaceSound
Processing
Module
CheckAudioSignal
AlSlereoPower
AmpSpeakerPlug
J301-1.5
CheckStereoPower
AmpO203.Q204.
O202. Q201Or
ReplacePowerAmp
CheckSpeaker
WiringAndPlug
P301
UseAudioTest
Chan3.UseVideo
TestChart4.
Check:TSCon-
troller
OrReplace
Controller.

Chart4
Symptom:
NoAudio,No
Video
CheckTuner
InterfaceVoltage
Note:BeforeVideo
AndAudioTests.
CheckTheInput'
VoltageToTheIF
Module.IfVollageIs
Normal, Proceed
WithTheCable
Tests.
CheckDiodeD18
C52.
CheckVoltageAt
TP15.
Replace
IFModule CheckR74.C52.14
C53.
Charts
Symptom:
NoVertical
Deflection
Chart 6
Symptom:
PictureRolls
CheckDeflection
PanelTP1745V
Source.
CheckR81.CS7,D20
CheckDeflection
PanelTP22.
CheckQf7,Q18,
R108,R107.
CheckTP20For
SawtoothSignal.
JumperHorli.
OscillatorModule
"OscSel"Pln».
AdjustLI.
CheckHorlj.
OscillatorIC1,
OscillatorCollLI,
OrReplaceModule.
RemoveJumper
From"OscSet"Pins.
Horltontal
OscillatorOK.
CheckHorli.Osc.
ModuleTP1For
VideoSignal
No
ReplaceTuner
Yes
CheckVollage
DeflectionPanel
DiodeD18Cathode.
CheckIC3.R93,
C70. Horl/onlil
OscillatorModule
IC2OrReplace
Module.
CheckC72015.
018. 01B0rflspl.ce
DeflectionPanel.
CheckYoke Inter-
connectAndPlugs
C78.R117.RH8.
VerticalSweep
CircuitsOK.
UnplugSyncCable
ToI/OPanelJ707.
PlugCableInto
JackPlate.Tuner
VideoOut.
CheckI/OPanel
Q28.R124.R125,
OrReplaceI/O
Panel.
CheckHoriz.Osc.
Module01,02,C4,
OrReplaceModule.'
CheckSyncCable
FromI/OPanelJ707
ToHorli.Oscillator
ModuleJ302Or
ReplaceI/OPanel.

Chart 7
Symptom:
SetShutsDown
DefeatQ7On
DeflectionPanel
JumperCollectorTo
^ Ground.Power
Set.
Note:ShutDown
CircuitsAreLocated
OnThePower
SupplyAndDetec-
tionPanels.Defeat-
ingOneAtA Time
WillDetermineThe
ShutDownTrigger
Source.
Chart 9
Symptom: one colormissing
Interchange
CRTPanels.
PowerSet.Check
CRTFilaments.
Yes
No CheckYoke
Inter-
connectAndRGB
YokesWindings,
DeflectionPanel07.
26, C36.
Color
Misslr
No CheckQ2,C2.03
01. 01.Q4Or
iReplaceCRT
Panel.
Remove07 Jumper.
JumperDeflection
PanelTP7To
Ground. PowerSet.
Chart 8
TunerVoltages
Interchange
Video
CableAtCRT
Panels.
CheckDeflection
Panel04.Q3,Power
SupplyPanel014.
OrReplacePower
SupplyPanel.
CheckHorlx.Oscil-
latorModuleICt,
IC4, OrReplace
PowerSupplyPanel.
All BAND TUNER
PlugP/J)J VOIHOM
Pn 1
P.n? P,«] P.o
4
P.n 5
InO 3 S 5V OV 4v ?4V <?V
"• O 1
C*3H
S Sv
5 5v
0;
17y i?V ?4V l?V
JHf-14 SSv Uv 65v
65V
?4V
1t\l
l?V
ALL BANO TUNER
PlugP'JJtVoll.g,i
P,n P.i? P.„1 P.n
4
IPC*3
ISV •?V.|jv
NC
MI r>; i;v l?VI5V
NC
C*b 14
'?V .IJV
NC
UMf14
»?v
OV-ISV
NC
Replace
VideoCable.
ChechVideoP'o-
ccssor P.inel 026.
IC4. C98OrReplace
VideoProcessor
Panel
CheckDeflecllon
PanelQ8,Q9.Q10,
OrReplaceDeflec-
tionPanel.PowerSet. ReplaceRGBButler
IC6VideoProcessor
IC2, OrVideo.
ProcessorPanel.
Does
SetShut
Down?
No SystemOK.
Yes

Chart10
Symptom:
Color Bandat Bottom
Of Picture
CheckPlclurtFor
ColoredBandAt
Bottom01Picture.
CRTsCoupling
LiquidLevelOK.
CheckColor
01Band.
ReplaceBlueCRT.
LiquidCoupling
LevelLow.
ReplaceRedCRT.
LiquidCoupling
LevelLow.
ReplaceGreenCRT.
LiquidCoupling
LevelLow.
Chart11
Symptom:
SetDoes Not
Converge
AdjustCustomer
ConvergenceCon-
trolsRotateVertical
RedAndBlueCon-
trolsCWAndCCW
Check
I VoltageSources
TP16Is8VTP!8Is
1SVJ604-2Is16V
TPUIs-BVTPI9I,
-•5VJ604-1Is-16V
ISelectCrosshair
PatternPlaceTest/
NormalSwitchIn
TestPosition.
3 TuneSetToLive
Channel.
RotateRedAndBlue
HorizontalControls
CWAndCCW.
Check P/J606 Wires
R1W.ICII.R139
IC13.
Check P/J606 Wires
R96.IC10.Rt20
IC12.
Customer
Convergence
CircuitsOK
CheckCrosihalch
UnplugRedAnd
BlueC2 Connector.
«UseCrosshatch
Generator*
GreenKeystone
CorrectionCircuits
OK.
AdjustTrapezoid
ControlRP32. CheckIC2,Q4,OS
Rt56, R161,Or
ReplacePanel.
IReconnectRedAnd
BlueG2Connectors
TouchUp
1Convergence.
AdjustKeystone
ControlRP8.

Chart12
Symplom:
PincushionError
Top/BottomAndSide
CheckCrosshatch
ForSidePincushion
Error.
Setup
1. UseCrosshatch
Generator.
SidePincushion
CircuitsOK.
AdjustSide Pin-
cushionControls
RP29,RP30,And
RP31.
CheckIC2.Q7,Q|,
RH3, Rt 19, R95Or
ReplacePanel.
CheckCrosshatch
ForTop/Bottom
Pincushion Error.
Top/Bottom Pin-
cushionCorrection
CircuitsOK.
AdjustTop/Bottom
PincushionControl!
RP19,RP18.
CheckIC3,06R154
Rl33,R112,Or
ReplacePanel.
Top/Bottom Pin-
cushionCircuitsOK.