Panasonic PVDF204 - DVD/VCR/TV COM User manual

ORDERNO. MKE0403600C1
B6, B22
TV/ DVD/ VCR Combination
PV-DF204 / PV-DF2004 / PV-DF274 / PV-DF2704 / PV-DF2004-
K/ PV-DF2704-K
Forservicing theR4-MechanismChassisforPV-Model, Please refer
totheR4-Mechanism-Chassis-for-PV-Model Service Manual (Order
No. MKE0401000C1).
SPECIFICATIONS
1

2004 Matsushita Kotobuki Electronics Industries LTD. All rights
reserved. Unauthorizedcopying and distribution isaviolation of
law.
1. SAFETYPRECAUTIONS
1.1. GENERALGUIDELINES
1. IMPORTANTSAFETYNOTICE
Therearespecial components usedinthisequipmentwhichare
importantforsafety. These parts aremarkedbyinthe
SchematicDiagrams, CircuitBoardLayout, ExplodedViewsand
ReplacementParts List. Itisessentialthat these critical parts
shouldbereplacedwithmanufacturer’sspecifiedparts toprevent
X-RADIATION, shock, fire, orotherhazards. Donotmodifythe
original design withoutpermission ofmanufacturer.
2. AnIsolation Transformershouldalwaysbeusedduring the
2

servicing ofCombination DVDVCR whose chassisisnotisolated
fromtheACpowerline. Use atransformerofadequate power
rating as thisprotects thetechnicianfromaccidents resultingin
personal injuryfromelectrical shocks. Itwill alsoprotect
Combination DVDVCR frombeing 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), 32.0
kV(Formodel withRound 27 inchCRT), 33.0kV(Formodel with
Flat 27 inchCRT)arepresentwhenthisTVset isinoperation.
Operation oftheTVset withouttherearcoverinvolvesthedanger
ofashock hazardfromtheTVset powersupply. Servicing should
notbeattemptedbyanyonewho isnotthoroughlyfamiliarwiththe
precautionsnecessarywhenworking on high voltageequipment.
3

AlwaysdischargetheanodeofthepicturetubetotheCRTground
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.
4

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), 32.0kV(Formodel withRound 27 inchCRT), 33.0kV(For
model withFlat 27 inchCRT)withoutcausing X-Radiation.
NOTE:
Itisimportanttouse anaccurate periodicallycalibratedhigh
voltagemeter.
1. Reduce thebrightness tominimum.
2. Set theSERVICEswitchtoSERVICE.
3. MeasuretheHigh Voltage. Themeterreading shouldindicate 28.0
kV±1.5kV(Formodel with20 inchCRT), 30.0kV±2.0kV(Formodel
withRound 27 inchCRT), 31.0kV±2.0kV(Formodel withFlat 27
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
5

1. Turnoff TVset.
2. Connect thecircuitbelow betweenTP554 and TP555 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+18.5V(Formodel withRound 20 inchCRT), +
21.5V(Formodel withFlat 20 inchCRT), +22.0V(Formodel with
Round 27 inchCRT), +20.0V(Formodel withFlat 27 inchCRT)is
notpresentat that pointwhen120 VACisapplied, find thecause.
Check R508, R503, R5504, R5505, D503, C513, C5507 and J5501.
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, R503 and R5504. Undernormal conditions, thevoltageat
IC5301 Pin11 isless thanapprox. 6V. Ifthehigh voltageatFlyback TransformerPin5exceeds
thespecifiedvoltage, thepositive DC voltagewhichissuppliedfrom theD503 cathodealso
increases. TheincreasedvoltageisappliedtoIC5301 Pin11 through R508, R503 and R5504. Due
totheincreasedvoltageatIC5301 Pin11, thehorizontal oscillator frequency increases, thepicture
goes outofhorizontal sync, thebeam currentdecreases and thepicturebecomedarkinorderto
6

keepX-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.
7

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
8

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. SELF-DIAGNOSIS INDICATIONDISPLAY
9

SimplifiedSelf-DiagnosticSystem facilitates finding thecause ofthefault. Thefollowing datawill
bedisplayedon theTV screen.
TheError CodedataisstoredintheMemoryIC(IC6004)(latesterror only). Thisdataiscleared
afteritisdisplayed, and thenthePOWERbutton ispressedback on.
1. Withpowerturnedoff, press FF and REW buttonson theunit
togetherforover3seconds. Fig. 1-1
2. TVpowercomes on and theunitgoes intoservice mode.
Thefollowing codes will bedisplayed.
Fig. 1-2
Fig. 1-3
Note:
Press anyoperation button exceptforPOWERorPLAY(DVD)on
eithertheunit, orDVDkeyon theremote todetecet that akeyhas
beenpressed. The3rddigitchanges to“1”onlywhenkeyis
detected. Fig. 1-4
10