Panasonic PV 20DF63 User manual

ORDERNO. MKE0303602C1
B6, B22
TV/DVDCombination
PV-20DF63 / PV-27DF63
SPECIFICATIONS
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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
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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
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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
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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
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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
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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.
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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
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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
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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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