Panasonic PV 20DF63 Manuel utilisateur

ORDERNO. MKE0303602C1

B6, B22

TV/DVDCombination

PV-20DF63 / PV-27DF63

SPECIFICATIONS

1. SAFETYPRECAUTIONS

1.1. GENERALGUIDELINES

1. IMPORTANTSAFETYNOTICE

Therearespecial components usedinthisequipmentwhichare

importantforsafety. These parts aremarkedbyinthe

SchematicDiagrams, CircuitBoardLayout, ExplodedViewsand

ReplacementParts List. Itisessential thatthese critical parts

shouldbereplacedwithmanufacturer’sspecifiedparts toprevent

X-RADIATION, shock, fire, orotherhazards. Donotmodifythe

original design withoutpermission ofmanufacturer.

2. AnIsolation Transformershouldalwaysbeusedduring the

servicing ofCombination TV/DVDwhose chassisisnotisolated

fromtheACpowerline. Use atransformerofadequate power

rating as thisprotects thetechnicianfromaccidentsresulting in

personal injuryfromelectrical shocks. Itwill alsoprotect

Combination TV/DVDfrombeing damagedbyaccidental shorting

that mayoccurduring servicing.

3. Whenservicing, observetheoriginal leaddress, especiallythe

leaddress inthehigh voltagecircuits. Ifashortcircuitisfound,

replace all parts whichhavebeenoverheatedordamagedbythe

shortcircuit.

4. Afterservicing, see toitthat all theprotectivedevices suchas

insulation barriers, insulation papers, shield, and isolation R-C

combinationsareproperlyinstalled.

5. Beforeturning thereceiveron, measuretheresistance betweenB+

lineand chassisground. Connect (-) sideofanohmmetertotheB

+lines, and (+)sidetochassisground. Eachlineshouldhave

moreresistance thanspecified,as follows:

B+ Line

MinimumResistance

130 V

110 (Coldchassisground)

28 V

180 (Coldchassisground)

220 V

1k (Coldchassisground)

6. WhentheTVset isnotusedforalong period oftime, unplug the

powercordfromtheACoutlet.

7. Potentials, as high as 33.0kV(Formodel with20 inchCRT), 30.0

kV(Formodel with27 inchCRT)arepresentwhenthisTVset isin

operation. Operation oftheTVset withouttherearcoverinvolves

thedangerofashock hazardfromtheTVset powersupply.

Servicing shouldnotbeattemptedbyanyonewho isnot

thoroughlyfamiliarwiththeprecautionsnecessarywhenworking

on high voltageequipment. Alwaysdischargetheanodeofthe

picturetubetotheCRTground ofreceiverbeforehandling thetube.

8. Afterservicing make thefollowing leakagecurrentchecks to

preventthecustomerfrombeing exposedtoshock hazards.

1.2. LEAKAGECURRENTCOLDCHECK

1. Unplug theACcordand connect ajumperbetweenthetwoprongs

on theplug.

2. Forphysicallyoperatedpowerswitches, turnpoweron. Otherwise

skipstep2.

3. Measuretheresistance value, withanohmmeter, betweenthe

jumperedACplug and eachexposedmetalliccabinet parton the

receiver, suchas screwheads, connectors, etc. Whentheexposed

metallicparthas areturnpathtothechassis, thereadingshould

bebetween1M and 12 M . Whentheexposedmetal does not

haveareturnpathtothechassis, thereading must beinfinity.

1.3. LEAKAGECURRENTHOTCHECK

1. Plug theACcorddirectlyintotheACoutlet.

Donotuse aisolation transformerforthischeck.

2. Connect a1.5k , 10 Wresistor, inparallel witha0.15 F

capacitor, betweeneachexposedmetallicparton theset and a

good earthground, as showninFigure1.

3. Use anACvoltmeter, with1k /Vormoresensitivity, tomeasure

thepotential across theresistor.

4. Check eachexposedmetallicpart, and measurethevoltageat

eachpoint.

5. Reverse theACplug intheACoutlet and repeat eachoftheabove

measurements.

6. Thepotential at anypointshouldnotexceed0.75 VRMS.

Aleakagecurrenttester(Simpson Model 229 equivalent) maybe

usedtomake thehotchecks. Leakagecurrentmust notexceed1/2

mA. Incase ameasurementisoutsideofthelimits specified, there

isapossibilityofshock hazard, and thereceivershouldbe

repairedand recheckedbeforeitisreturnedtothecustomer.

Figure1

2. X-RADIATION

WARNING:

1. Thepotential source ofX-Radiation inTVsets istheHigh Voltage

section and thepicturetube.

2. Whenusing apicturetubetest fixtureforservice, ensurethat the

fixtureiscapableofhandling 33.0kV(Formodel with20 inch

CRT), 30.0kV(Formodel with27 inchCRT)withoutcausing X-

Radiation.

NOTE:

Itisimportanttouse anaccurate periodicallycalibratedhigh

voltagemeter.

1. Reduce thebrightness tominimum.

2. Set theSERVICEswitchtoSERVICE.

3. MeasuretheHigh Voltage. Themeterreading shouldindicate 31.0

kV±2.0kV(Formodel with20 inchCRT), 28.0kV±1.5kV(Formodel

with27 inchCRT).

Ifthemeterindication isoutoftolerance, immediate service and

correction isrequiredtopreventthepossibilityofpremature

componentfailure.

4. To preventanX-Radiation possibly, itisessential touse the

specifiedpicturetube.

2.1. HORIZONTALOSCILLATORDISABLECIRCUITTEST

SERVICE WARNING:

Thetestmustbemadeas afinal check beforesetisreturnedtothecustomer.

CONFIRMATIONOFX-RAYMOVEMENT

1. Turnoff TVset.

2. Connect thecircuitbelow betweenTP553 and TP554 on theTV

MainC.B.A. Figure2

3. Turnon SW1and thenturnon theset. Confirm that thepictureis

on thescreenproperly.

4. Confirm that thepicturegoes outofhorizontal syncwhilegetting

downbyvarying VR.

5. Ifthisdoes notoccur, itmeansthat X-rayprotect circuitisnot

operating. Furtherconfirmation and repairisrequired.

2.2. REPAIRPROCEDURES OFHORIZONTALOSCILLATOR

DISABLECIRCUIT

1. Connect aDC voltmeterbetweencapacitorC513 (+)on theMain

circuitboardand chassisground.

2. Ifapproximately+23.0V(Formodel with20 inchCRT), +21.5V

(Formodel with27 inchCRT)isnotpresentat that pointwhen120

VACisapplied, find thecause. Check R508, R503, R5505, C5507,

C513 and D503.

3. Carefullycheck abovespecifiedparts and relatedcircuits and

parts. Whenthecircuitisrepaired, trythehorizontal oscillator

disablecircuittest again.

2.3. CIRCUITEXPLANATION

2.3.1. HORIZONTALOSCILLATORDISABLE CIRCUIT

Thepositive DC voltage, suppliedfrom theD503 cathodefor monitoring high voltage, isapplied

totheIC5301 Pin11 through R508 and R5504. Undernormal conditions, thevoltageatIC5301 Pin

11 isless thanapprox. 6V. Ifthehigh voltageatFlybackTransformerPin5exceedsthespecified

voltage, thepositive DC voltagewhichissuppliedfrom theD503 cathodealsoincreases. The

increasedvoltageisappliedtoIC5301 Pin11 through R503 and R5504. Duetotheincreased

voltageatIC5301 Pin11,thehorizontal oscillator frequency increases, thepicturegoes outof

horizontal sync, thebeam currentdecreases and thepicturebecomedarkinordertokeepX-

radiation underspecification.

Figure3

2.4. LASERPRODUCT

CLASS ILASERPRODUCT

-ThisequipmentiscertifiedtocomplywithDHHSRules 21 CFR

Chapter1, SubchapterJineffect as ofdate ofmanufacture. (Only

forU.S.A.)

Thisequipmentisclassifiedas aClass I(Class 1)level LASERProductand thereisno hazardous

LASERradiation withthesafetyprotection.

Caution:

Use ofcontrolsoradjustments orperformance ofprocedures other

thanthose specifiedhereinmayresultinhazardousradiation

exposure.

Nevertouchtheinternal partsinordertoavoidEXPOSURE TOVISIBLE LASERRADIATION.

Unplug theACpowercord totheequipmentwhenopening thetop cover.

WhenthepowerswitchisOn, do notplace your eyes close tothefrontpanel opening door or the

otheropeningstolookintotheinterior unit.

LASERSpecification

Class Ilevel ALASERProduct(Class 1level ALASERProduct)

WaveLength:

647 -677 nm(at DVD)

775 -815 nm(at CD)

LaserPower:

Nohazardousradiation isemittedwiththesafetyprotection.

2.5. PRECAUTIONOFLASERDIODE

CAUTION:

Thisunitutilizes aclass III alaser. Visiblelaserradiation isemitted

fromtheoptical pickup lenswhentheunitisturnedon:

1. Donotlookdirectlyintothepickup lens.

2. Donotuse optical instruments tolookat thepickup lens.

3. Donotadjust thepreset variableresistoron theoptical pickup.

4. Donotdisassembletheoptical pickup unit.

5. Iftheoptical pickup isreplaced, use themanufactures specified

replacementpickup only.

6. Use ofcontrol oradjustmentorperformance ofprocedures other

thanthose specifiedhereinmayresultinhazardousradiation

exposure.

3. PREVENTIONOFELECTROSTATICDISCHARGE

(ESD) TO ELECTROSTATICALLYSENSITIVE (ES)

DEVICES

Somesemiconductor (solidstate)devices canbedamagedeasilybystaticelectricity. Such

componentscommonlyarecalledElectrostaticallySensitive (ES)Devices. Examples oftypical

ES devices areintegratedcircuitsand somefield-effecttransistorsaresemiconductor "chip"

components. Thefollowing techniques shouldbeusedtohelpreduce theincidence of

componentdamagecausedbyelectrostaticdischarge(ESD).

1. Immediatelybeforehandling anysemiconductorcomponentor

semiconductor-equippedassembly, drainoff anyESDon your

bodytouching aknownearthground. Alternatively, obtainand

wearacommerciallyavailabledischarging ESDwrist strap,

whichshouldberemovedforpotential shock reasonspriorto

applying powertotheunitundertest.

2. Afterremoving anelectrical assemblyequippedwithES devices,

place theassemblyon aconductivesurface suchas aluminum

foil, topreventelectrostaticchargebuildup orexposureofthe

assembly.

3. Use onlyagrounded-tipsoldering iron tosolderorunsolderES

devices.

4. Use onlyananti-staticsolderremoval device. Somesolder

removal devices notclassifiedas "anti-static(ESDprotected)"can

generate electrical chargesufficienttodamageES devices.

5. Donotuse freon-propelledchemicals. These cangenerate

electrical charges sufficienttodamageES devices.

6. DonotremoveareplacementES device fromits protective

packageuntil immediatelybeforeyou arereadytoinstall it. (Most

replacementES devices arepackagedwithleadselectrically

shortedtogetherbyconductivefoam, aluminumfoil or

comparableconductivematerial).

7. Immediatelybeforeremoving theprotectivematerial fromthe

leadsofareplacementES device, touchtheprotectivematerial to

thechassisorcircuitassemblyintowhichthedevice will be

installed.

CAUTION:

Besureno powerisappliedtothechassisorcircuit, and observe

all othersafetyprecautions.

8. Minimizebodilymotionswhenhandling unpackagedreplacement

ES devices. (Otherwise harmless motion suchas thebrushing

togetherofyourclothes fabricorthelifting ofyourfootfroma

carpetedfloorcangenerate staticelectricity(ESD)sufficientto

damageanES device).

"NOTE toCATV system installer:

Thisreminderisprovidedtocall theCATVsysteminstaller’s

attention toArticle820-40 oftheNECthat provides guidelines for

propergrounding and, inparticular, specifies that thecableground

shall beconnectedtothegrounding systemofthebuilding, as close

tothepointofcableentryas practical."

4. ABOUTLEADFREE SOLDER (PbF)

5. SERVICE NOTES (PLEASE READ)

5.1. SERVICENOTES

5.1.1. SIMPLIFIEDFAULT FINDINGDATA

SimplifiedSelf-DiagnosticSystem facilitates finding thecause ofthefault. Communication for I2C

buscodewill bedisplayedon TV screen.

TheSimplifiedFaultfinding dataisstoredintheMemoryIC(IC6004). Thisdataisclearedafterit

isdisplayed, and thenthePOWERbutton ispressedback on.

1. Withpowerturnedoff, press PLAYand SKIP+buttonson theunit

togetherforover3seconds. Fig. 1-1

2. TVpowercomes on and theunitgoes intoservice mode.

Communication forI2Cbuscodewill bedisplayed.

Fig. 1-2

Fig. 1-3

3. Press anyoperation button exceptforPOWER, CH UP, CH DOWN,

LIGHTorDSS CABLEbuttonson eithertheunit, ortheremote to

detect that akeyhas beenpressed. "0"will bedisplayedonly

whenkeyisdetected.

Fig. 1-4

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