JBL 6810 Guía de instalación

Professional

Video

Products

TECHNICAL

TRAININGMANUAL

MODEL6810AND6820

VIDEOPROJECTOR

JBLInternational

8500BalboaBlvd.

Northridge,CA91329

(818)

893-8411

JBL

CONTENT

SubjectPage

SignalFlowBlockDiagram3

PowerSupplyPanel4

SwitchedRegulator6

HighVoltageRegulator7

DeflectionPanel8

HorizontalSweepCircuits8

VerticalSweepCircuits9

OverloadProtectionCircuits10

TS10TuningSystem11

RFSwitcher18

IFModule16

Stereo/SAPDecoderModule17

TunerInterfacePanel20

input/OutputPanel22

AudioSwitchingCircuits23

Video/SyncSwitchingCircuits23

RGBSwitchingCircuits24

ComputerIntensityBitSwitchingCircuits25

InsertVideoSwitchingCircuits25

SoundProcessingModule& StereoAmplifier26

CombFilterModule28

VideoProcessorPanel30

AutoSharpnessControl30

VideoProcessingCircuits31

ChromaProcessingCircuits31

SandCastleGenerator31

RGBProcessingCircuits32

VerticalSweepFailSafeCircuits32

CRTDrivePanel33

ConvergencePanel35

HorizontalDelayModule35

ConvergencePanelVoltageSource37

SawtoothGenerator37

HorizontalWaveformAmplifier38

VerticalWaveformAmplifier38

Top/BottomPincushionGenerator39

Trapezoid/KeystoneGenerator39

SidePincushionGenerator41

ConvergenceOutputAmplifiers41

CrosshairGenerator41

Figure1 - SignalFlowBlockDiagram

Signal

Flow

BlockDiagram

ThemajorfunctionsoftheprojectionTVsystem

areshownintheOverallBlockDiagram,Figure

TheselectedRFsignalisfedfromtheRF

SwitchertotheTunerandconvertedtoVideoIF.

TheIFModule,locatedontheTunerInterface

PaneldetectsbothCompositeVideoandwideband

AudiofromtheIFsignal.Theaudiosignalisfed

totheStereo/SAPDecoderModule,whichchecks

forbothStereoPilotandSAPFMcarriers.To

selecteitherStereoorSAPAudio,theapprop-

riatebuttonontheAudioSelectKeyboardis

pressed.

Associatedlogiclevelsaresentfromthe

TunerInterfacePaneltotheStereo/SAPDecoder

andtheAudioProcessingModuletoselectthe

modeofoperation.TheselectedAudioisdecoded

andfedtotheI/OPanelTunerAudioinput

J712-1,

-3whereitisbuffered,switched,and

outputat

J718-1,

-4.TheAudioProcessing

Module,locatedontheStereoPowerAmplifier,

processestheselectedAudio.IftheStereobutton

wasnotpressed,theinputstotheAudio

ProcessorremainintheMonauralmode.Audio

Volume,Bass,andBalancecontrolsadjustthe

drivetotheStereoPowerAmplifier.

DetectedVideofromtheIFModuleisfedthrough

theTunerInterfacePanelJ32toI/OPanel

J707,

theTunerVideoInput.TheComposite

Videosignalisamplified,switched,buffered,and

outputatJ717forVideoprocessingandJ709

forSyncprocessing.TheCompositeVideois

processedintoLuminance,VerticalDetail,and

Chromasignals.LuminanceandVerticalDetail

signalsarematrixedandoutputatP501-5,-6,

andChromaisoutputatJ501-10.

TheVideoProcessorPanelreceivespositive

Video,negativeVideo,andChromafromtheComb

Filter.Thesesignalsareprocessedintodecoded

R,G,andB Video,thenbufferedandfedfromthe

VideoProcessorPaneloutputsJ406,J405,and

J404toI/OPanelinputsJ708,J706,J705

respectively.AdditionalR,G,andB signal

processingaddsDCRestoration,BlackLevel,

SandCastle,andVerticalandHorizontal

Blanking.

TheprocessedR,G,andB signalsare

bufferedandfedtotheindividualCRTsthrough

theCRTDrivePanels.

HEATSINK

HVDRIVER

Q11J

HEATSINK

SWITCHED

REGULATOR

Q10

STAND-BY

POWERTRANSFORMER

TP9

HEATSINK

HVREGULATOR

Q14

NSFORMER

FORMER

SWITCHING

TRANSFORMER

Figure2 - PowerSupplyPanel

PowerSupplyPanel

Thelocations

majorcomponentsonthePower

Supply

are

shown

Figure

Starting

inthe

lowerleft,they

are:

Stand-By

and

Start-Up

PowerTransformer;above

isthe

heatsink,

SwitchedRegulator,

and

SwitchingChoke;then

the

Transformer,

Driver,

Regulator

andheatsink;

onthe

right

isthe

Panelpin-outs;

below

thePowerRelay.

TheBlockDiagram,Figure

shows

the

basic

blockfunctions

thePowerSupplyPanel.

The

PowerSupplyproducesninevoltages

(twoof

which

are

regulated),

andone

ErrorLatch

circuitprovidesover-current

and

over-voltage

shutdown.

120Vac

appliedfrom

theAC

Interconnectboard

tothe

RelaySwitchRY1,

the

12VdcStand-Bysupply,and

the

24VdcStart-Up

supply.The12VdcStand-ByPower

fed

tothe

TunerControllerandTunerInterfacePanel.

The

24VdcStart-UpvoltageenergizestheDeflection

PanelandTunerController.WhenthePower-On

button

pressed,

the

PowerRelayControlline

activatesthePowerRelay,connecting120Vac

theVoltageDoubter.

The

310Vdcfrom

the

VoltageDoubler

fed

theSwitchedRegulator,

whichoutputsthe130Vdcsourcevoltage.

TheDeflectionPaneloutputsHorizontalDrive

pulses

tothe

Optic-Coupler

and

drives

the

SwitchedRegulator.TheHorizontalDrivepulses

control

theOn

time

ofthe

Regulator

(and,

therefore,theoutputvoltage)

means

Pulse

WidthModulation(PWM).

The

130Vdcoutput

from

the

SwitchedRegulator

isfedtothe

DeflectionPanelandHighVoltageRegulator.

The

HighVoltageRegulatorcontrolsthe30KVHV

regulating

the

117Vdcinput

totheHV

Trans-

former.

The

HorizontalDrivepulses

arefed

from

the

SwitchedRegulator

tothe

Horizontal

Drivecircuit

andthe

HorizontalOutput

transistor

developflybackandscanpulses

for

theover-voltageshutdown

andHV

Regulator

circuits.When

overloadresultsfrom

overvoltage

overcurrentcondition,

the

SwitchedRegulator

turned

offby

thesignal

theshutdownline.

Initially,

the

PowerSupplyPanelprovides

12VdcStand-Byvoltage

tothe

TunerInterface

PanelandtheTunerController.

(20

VAC

INTER-

CONNECT

PANEL

J7,

l,3

I20

VAC

JI03

1,3

HORIZONTAL

DEFLECTION

PAH EL

CVOSVOLTAGE/

•DVEf?tOi'.fl«E*ir"

SHUTDOWN

P2I7

-II

DRIVE

JI07

-4

JI08

-4

POWER

RELAY

POWERSUPPLYPANEL

VOLTAGE

DOUBLER

POWER

SUPPLY

3I0VDC SWITCHED

REGULATOR

(PWM)

I2VSTANDBY

SUPPLY

24VSTART-

UPSUPPLY

I2VDC

24VDC

0PT0-

ISOLATOR

COUPLER

SHUTDOWN

JI07

-7

DRIVE

I30V0C

REGULATOR

II7VDC

DRIVE

ADJUST

I0VDC

REGULATOR

REFERENCE

IOV0C

XFMR

!I06

-3 POWERRELAYCONTROL

JI06

-I

TUNER

INTERFACE

PANEL

TUNER

CONTROLLER

JI08

-6,-7

30KV

JIOI

KVFOCUS.

J109

JI07

2I0V

-i

OVER

VOLTAGE

SHUT-DOWN

>•130VOC

SOURCE

HORIZONTAL

DEFLECTION

PANEL

TOOVER

VOLTAGE

SHUTDOWN

CIRCUIT

Figure

3 -

PowerSupplyBasicBlock

Dia

AsseeninFigure4 the12VdcStand-Byvoltage

isappliedtothe5VRegulatorIC500-3whereit

becomestheKeepAlivevoltageforMicro-

computerIC1000.TheRelaycontrolvoltageand

the24VdcStart-Upvoltageareproducedwhen

thePowerbuttonispressed.Thekeypressis

decodedbytheMicrocomputerIC1000intoa

logicLowatpin1,whichturnsOffQ19and

turnsOnQ20.TheswitchingactionofQ20pulls

thePowerRelayRY1,Q3andQ2toground.Q1

conductsandapplies24VdctothePowerRelay.

Therelaylatchesandconnects120Vactothe

VoltageDoubter.Q1alsosupplies24Vdctothe

HorizontalOscillatorModuleandOpticCoupler

IC1onthePowerSupplyPanel.

Apulsetrain,developedbytheHorizontal

JI03-

OscillatorModule,drivestheHorizontalsweep

circuitsandtheSwitchedRegulatoronthePower

SupplyPanel.R5andC10forma twosecond

timing circuit.C10beginstochargetoward

42VdcafterthePowerbuttonispressed.Ifthe

voltageonC10reaches15.8voltsbeforethe

scanderivedvoltagesaredeveloped,zenerZ1

turnsOn.ThisplacesQ3intosaturation,

removesQ2forwardbiasandshutsdownthe

Start-UpSupply.Duringthistimeperiod,if

HorizontalOutputTransformerT2andHV

TransformerT4aredriven,theflybackpulses

arerectifiedandproducethederivedvoltages.A

scan-derived24VdcfromtheDeflectionPanelis

fedthroughdiodeD6to.zener

andturnsOffQ1

whileintheRunMode.AftertheStand-Byand

Start-Upmodesarecompleted,theRunMode

takesover.

VOLTAGE

POWER

D0UBLER

RELAY

URYI

_24VDC

CJTP2TO

.HORIZ

OSCILLATOR

MODULE

DERIVED

24V>

(RUN

MODE)

TS10

CONTROLLER

PANEL

Q19

RELAY

CONTROL

SWITCH

Figure

4 -

Power

Circuit

TP6

QIO

SWITCHED

REGULATOR

POWER

COMMON

HVXFMR

T4-I

HV(EHT)

REGULATOR

QI4

FROM

SHUTDOWN

TP2

LATCH

HORIZPULSE

50/50

DUTYCYCLE

J'07

FROM

-4

DEFLECTION

PANELJ215-5

SWITCHED

REGULATOR

POWER

SUPPLY

(PULSEWIDTHMODULATOR)

Figure5 - SwitchedRegulatorCircuit

SwitchedRegulator

theRun

Mode,drivepulsesdeveloped

the

HorizontalOscillatorModule

arefedtothe

Optic-

CouplerDriver

Q4,

Figure

The

50/50duty

cyclepulsetrain

fed

from

the

DeflectionPanel

throughJ215-5

and

PowerPanelJ107-4

Q4.

Twogroundsystems

are

used

inthe

Switched

Regulatorcircuit

separate

"acM

groundfrom

"signal"

ground.

The

Optic-Coupler,

IC1,

separates

the

circuitsusingdifferentgrounds

couplingsignalsfrom

one

circuit

tothe

other

with

LED/Phototransistor

package.

The

majorcomponents

inthe

SwitchedRegulator

circuit

are:the

Optic-CouplerDriver

Q4,

Optic-Coupler

IC1,

Pulse

AmpQ5,

Ramp

CapacitorC13,

B+

AdjustRP1,

B+

Control

Q6.

PulseTransformerDriver

Q9,

Pulse

TransformerT2,

and

SwitchingRegulatorQ10.

The310Vdcoutputvoltagefrom

the

Voltage

Doubler

used

charge

the

RampCapacitor

C13,

forwardbias

through

R34andR35,

and

providecollectorvoltage

tothe

130V

SwitchingRegulatorQ10.

The

regulatedvoltage

atQ10emitterandTestPointTP7

adjusted

130Vdcwith

RP1

B+

Adjust.

The

130Vdc

appearsacross

anRC

networkthatincludesRP1,

and

zenered

6.8Vdc

for

IC1

B+,

forwardbias,andQ9and

emittervoltages.

switched

and

Offby

IC1

50/50duty

cyclepulsetrain.When

Q5isOn,C13is

dischargedand

clamped

theD17voltagedrop

of0.7Vdc.

base

pullednegative,turning

Off

Q9.

C13begins

chargethroughR34andR35.

turn-Offtime,

C13

discharges

viaQ6,

holding

Q9On

until

switched

charge

C13.

When

the

charge

and

discharge

C13

remainsconstant,

the

switchingpulse

toQ10

baseremainsconstant

andthe

130Vdcremains

constant.However,

the

130Vdcincreases,

the

voltage

RP1

wiperincreases,turningdown

Q6.

C13discharge

less,and

base

pulled

lessnegativecausingQ9

turn

sooner.

Q10

remains

Off

longer

and

the

increased130Vdc

returns

normal.When

the

130Vdcsupply

decreases,RP1wiperfeeds

lowervoltage

Q6,

turning

harder,whichpermits

C13

dischargemore.

base

pulledmorenegative

causing

turn

later.

Q10

thenremains

Onlonger,raising

the

decreased130Vdc

normal,

the

regulated130Vdc

isfedtothe

HorizontalOutputTransformer

T2-15

andHV

RegulatorQ14.

HighVoltageRegulator

TheHVRegulatorcircuit,Figure6,isdriven

bya controlcircuitconsistingofa voltage

comparatorOp-AmpIC2,HV(EHT)AdjustRP2,

DifferentialAmpQ12,Q13,andHVRegulator

Q14.

"EHT"meansExtraHighTension.Theterm

isa remindertothetechnicianthatthe30KV

ProjectionCRTAnodevoltagehashighcurrent

capabilities,unlikeconventionalpicturetubes,

andthatextremecautionmustbeexercisedwhen

workingaroundHVCircuits.Thevoltageonthe

inverting(-)inputofComparatorIC2is

adjustedbyRP2andcomparedtothenon-

inverting(+)inputpotentialzeneredto6.8Vdc

byZ4.TheoutputvoltageatIC2-6issetbyRP2

tobalancetheDifferentialAmpinverterstage

Q13tothenon-invertingstageQ12,whichis

forwardbiasedby6.8VdcfromZ4andD19.Q12

forwardbiasesQ14HVRegulatortooutput

117VdctoHVTransformerT4-13.Regulation

occurswhenthe10Vdc(ETH)Referencevoltage

decreasesorincreases.Ifthescan-derived

10Vdcdecreases,thedecreasedvoltageatRP2

wiperandIC2-2causestheComparatorIC2-6

outputtoriseandturnQ13Onharder,raising

Q13andQ12emittervoltages.Q12conductsless

anditscollectorvoltagerises,turningOnQ14to

restorethe10Vdc(EHT)Referenceby

increasingthe117VdctoHVTransformer

T4-13.

Whenthe10Vdc(EHT)Referencevoltage

increases,theComparatorIC2-2voltagerises

andcausestheIC2-6outputtodecrease.Q13

conductslessandlowersbothQ13andQ12

emittervoltages,whichthenlowersQ12

collectorvoltage.Q14conductslessandrestores

the10Vdc(EHT)Referencebydecreasingthe

117VdctotheHVTransformer.A largeincrease

inbeamcurrenttendstolowertheHVandthe

scanpulseamplitudeusedforthe10Vdc(EHT)

Reference,andlowbeamcurrentcausesan

increaseinHVandthescanpulsevoltage.These

conditionsaremonitoredbyIC2,whichinitiates

thecorrectionforbothconditionsandmaintains

aconstant30KVHVtotheCRTs.

I30VDC

SOURCEw

RP2

NON-SERVICE

EHTADJUST

Figure6 - HighVoltage(EHT)RegulatorCircuit 7

DeflectionPanel HorizontalOscillatorModule

ThephotographshowingtheDeflectionPanel,

Figure

7,callsoutthepowersupplysection

andcomponents.Thepanelisdividedinto

Verticalsweepcircuitry andthepowersupplies

forthescan-deriveddcvoltages.TheHorizontal

OscillatorModuleisattachedandsupportedby

theVerticalOutputheaksink.Othermajor

componentsare:theHorizontalOutputTrans-

formerT2,HorizontalOutputTransistorQ10,

DriveTransformerT1,LinearityCoilL2,

Pre-DriverQ8,DriverQ9,andScanPulse

RectifiersD15throughD20.

ThecircuitsoftheHorizontalOscillatorModule

areshowninFigure8.Theinternalfunctionof

IC1are:SyncSeparator,VideoAmp,AGC,Noise

inverter,PhaseShaper,PhaseControl,andthe

31.5KHzOscillator,the31.5KHzOscillator

frequencyisadjustedwithcoilL1,whilethe

OscillatorSet-UptestpointTP2isjumperedto

ground.

GroundingTP2allowstheoscillatorto

free-runandcausesthepicturetoroll

vertically.L1shouldbeadjusteduntilvertical

rollstops,ornearlyso.Whenthejumperis

removedfromTP2,thepicturewilllock.

VERTICALSWEEP

DEFLECTIONPANEL

HORIZONTALSWEEP

DEFLECTIONPANEL

Figure7 - DaflectionPanel

DEFLECTION

PANEL

J2I7

VERT.

-10

BLANKING

-»

• • OUTPUT

J2I7«TP27

1-7TOVERT.

-»

„ SWEEPCIRC

-»

J2I7

-9

FROM

VERTICAL

|j2l7

tTPI8

OUTPUT

NN~6,,, TOHORIZ.

-j, PRE-DRIVER

Q5.Q6

J2I7

SHUT \\

DOWN

LATCH

Figure8 - HorizontalOscillatorModule

TheSyncsignalfromtheI/OPanelJ709isinput

atJ302andcanbeeitherCompositeVideoor

CompositeSync,dependingupontheprogram

source.Eithersignalis2Vppac-coupledtoQ1.

Q2collectoroutputs4VppnegativeComposite

VideotoIC1-3and-1.Thesignalisinverted,

amplified,

buffered,andcoupledtoPin4 at

5.5Vpp.TheexternalnetworkatPin4 limits

thehighandlowfrequencyinformationgoinginto

IC1-5.

SyncisremovedbytheSyncSeparator,

bufferedandfedtoIC1-6.InternalAGCkeeps

theSynctipsasa constantlevel.

The31.5KHzOscillatorsignaliscoupledtothe

CountDownIC2-9andCompositeSyncisfedto

theIC2-12and-13.IftheSyncsignalis

standardNTSCSync,theModeRecognitioncircuit

selectstheDivide-by-525Mode.The31.5KHz

signalatIC2-9iscounteddownto60Hz,which

triggerstheVerticalRampGeneratorand

developsdrivefortheVerticalSweepcircuit.

The31.5KHzpulsesarealsoappliedtoa Divide-

by-2CountertoproducetheHorizontalDrive

signal.

IftheSyncpulsesfedtoIC2-13arenot

standardNTSCSync,theModeRecognition

switchesfromtheDivide-by525Modetothe

IntegratedSignalMode.Theintegratedsignalat

IC2-12triggersa MonostableMultivibrator

which,

turn,

lockstheVerticalRamp

Generatortothenon-standardVerticalSync

signal.

PicturejittercanresultfrompoorNTSCSync,

non-standardSync,ornoise.Tostopthejit-

tering,

a SyncStabilizerswitchonthecontrol

panelcanbeplacedintheOnpositionwhichpulls

IC2-8fromgroundandswitchestheMode

RecognitioncircuittotheIntegratedSyncMode.

VerticalSweepCircuit

TheVerticalSweepcircuitisshowninFigure9

andconsistsofa differentialAmplifierQ15and

Q16,

VerticalDriverQ19,andComplementary

Push-PullOutputTransistorsQ17andQ18.

Q15andQ16forma differentialinput.A 2Vpp

verticalratesawtoothfromP31Q/J217-7

drivesQ15;itscollectorsignaldrivesQ19,

whichdrivesQ17andtheVerticalYokewindings.

Yokecurrentflowsthroughtheseriesresistor

R117.

ThevoltagedropacrossR117isapplied

totheVerticalLinearitycircuit.Vertical

LinearityisadjustedbyRP3.RP3andC81

reshapethefeedbacksignaltocorrectraster

linearityatthetophalfofthepicture.

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