Panasonic PV 20DF62 User manual

ORDERNO. MKE0204602C1
B6,B22
TV/DVDCombination
PV-20DF62 / PV-27DF62 / PV-27DF62-K
SPECIFICATIONS

2002 Matsushita Kotobuki Electronics Industries LTD. All rights
reserved. Unauthorizedcopying and distribution isaviolation of
law.
1. SAFETY PRECAUTIONS
1.1. GENERALGUIDELINES
1. IMPORTANTSAFETY NOTICE
Therearespecial components usedinthisequipmentwhichare
importantfor safety. These parts aremarkedbyinthe
SchematicDiagrams, CircuitBoard Layout, ExplodedViewsand
ReplacementParts List. Itisessential that these critical parts
shouldbereplacedwithmanufacturer’sspecifiedparts toprevent
X-RADIATION, shock, fire, or otherhazards. Donotmodifythe
original design withoutpermission ofmanufacturer.
2. AnIsolation Transformershouldalwaysbeusedduring the
servicing ofCombination TV/DVDwhose chassisisnotisolated
from theACpowerline. Use atransformerofadequate power
rating as thisprotects thetechnicianfrom accidents resulting in
personal injuryfrom electrical shocks. Itwill alsoprotect
Combination TV/DVDfrom being damagedbyaccidental shorting
that mayoccur during servicing.
3. Whenservicing, observetheoriginal leaddress, especiallythe
leaddress inthehigh voltagecircuits. Ifashortcircuitisfound,
replace all parts whichhavebeenoverheatedor damagedbythe
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 (-) sideofanohmmetertothe

B+ lines, and (+) sidetochassisground. Eachlineshouldhave
moreresistance thanspecified, as follows:
(For model with20 inchCRT)
B+ Line
Minimum Resistance
115 V
1k (Coldchassisground)
28 V
180 (Coldchassisground)
220 V
1k (Coldchassisground)
(For model with27 inchCRT)
B+ Line
Minimum Resistance
140 V
1k (Coldchassisground)
28 V
180 (Coldchassisground)
220 V
1k (Coldchassisground)
6. WhentheTV set isnotusedfor along period oftime, unplug the
powercord from theACoutlet.
7. Potentials, as high as 34.5kV arepresentwhenthisTV set isin
operation. Operation oftheTV set withouttherearcoverinvolves
thedangerofashock hazard from theTV set powersupply.
Servicing shouldnotbeattemptedbyanyonewho isnot
thoroughlyfamiliarwiththeprecautionsnecessarywhenworking
on high voltageequipment. Alwaysdischargetheanodeofthe
picturetubetotheCRTground ofreceiverbeforehandling the
tube.
8. Afterservicing make thefollowing leakagecurrentchecks to
preventthecustomerfrom being exposedtoshock hazards.
1.2. LEAKAGE CURRENTCOLDCHECK

1. Unplug theACcord and connect ajumperbetweenthetwo
prongson theplug.
2. For physicallyoperatedpowerswitches, turn poweron.
Otherwise skipstep2.
3. Measuretheresistance value, withanohmmeter, betweenthe
jumperedACplug and eachexposedmetalliccabinet parton the
receiver, suchas screwheads, connectors, etc. Whenthe
exposedmetallicparthas areturn pathtothechassis, the
reading shouldbebetween1M and 12 M . Whentheexposed
metal does nothaveareturn pathtothechassis, thereading
must beinfinity.
1.3. LEAKAGE CURRENTHOTCHECK
1. Plug theACcord directlyintotheACoutlet.
Donotuse aisolation transformerfor thischeck.
2. Connect a1.5k , 10 Wresistor, inparallel witha0.15 F
capacitor, betweeneachexposedmetallicparton theset and a
good earthground, as showninFigure1.
3. Use anACvoltmeter, with1k /V or moresensitivity, tomeasure
thepotential across theresistor.
4. Check eachexposedmetallicpart, and measurethevoltageat
eachpoint.
5. Reverse theACplug intheACoutlet and repeat eachoftheabove
measurements.
6. Thepotential at anypointshouldnotexceed0.75 V RMS.
Aleakagecurrenttester(Simpson Model 229 equivalent) maybe
usedtomake thehotchecks. Leakagecurrentmust notexceed1/
2mA. Incase ameasurementisoutsideofthelimits specified,
thereisapossibilityofshock hazard, and thereceivershouldbe
repairedand recheckedbeforeitisreturnedtothecustomer.
Figure 1

2. X-RADIATION
WARNING:
1. Thepotential source ofX-Radiation inTV sets istheHigh Voltage
section and thepicturetube.
2. Whenusing apicturetubetest fixturefor service, ensurethat the
fixtureiscapableofhandling 34.5kV withoutcausing X-Radiation.
NOTE:
Itisimportanttouse anaccurate periodicallycalibratedhigh
voltagemeter.
1. Reduce thebrightness tominimum.
2. Set theSERVICE switchtoSERVICE .
3. MeasuretheHigh Voltage. Themeterreading shouldindicate 32.5
kV±2.0kV.
Ifthemeterindication isoutoftolerance, immediate service and
correction isrequiredtopreventthepossibilityofpremature
componentfailure.
4. TopreventanX-Radiation possibly, itisessential touse the
specifiedpicturetube.
2.1. HORIZONTALOSCILLATORDISABLE CIRCUITTEST
SERVICEWARNING:
The testmustbe made as a final check before setis returnedto the customer.
CONFIRMATION OF X-RAYMOVEMENT
1. Turn off TV set.
2. Connect thecircuitbelowbetweenTP553 and TP554 on theTV
MainC.B.A. Figure 2

3. Turn on SW1and thenturn on 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
DISABLE CIRCUIT
1. Connect aDC voltmeterbetweencapacitor C513 (+) on theMain
circuitboard and chassisground.
2. Ifapproximately+21.5V isnotpresentat that pointwhen120 V
ACisapplied, find thecause. Check R503, R5505, C5507, C513
and D503.
3. Carefullycheck abovespecifiedparts and relatedcircuits and
parts. Whenthecircuitisrepaired, trythehorizontal oscillator
disablecircuittest again.
2.3. CIRCUITEXPLANATION
2.3.1. HORIZONTALOSCILLATORDISABLECIRCUIT
The positive DC voltage, suppliedfrom the D503 cathode formonitoring high voltage, is applied
to the IC5301 Pin11 through R503 and R5504. Undernormal conditions, the voltage atIC5301
Pin11 is less thanapprox. 3 V. Ifthe high voltage atFlyback TransformerPin5 exceeds the
specifiedvoltage, the positive DC voltage whichis suppliedfrom the D503 cathode also
increases. The increasedvoltage is appliedto IC5301 Pin11 through R503 and R5504. Due to
the increasedvoltage atIC5301 Pin11, the horizontal oscillatorfrequencyincreases, the picture
goes out of horizontal sync, the beamcurrent decreases and the picture become dark inorder
to keepX-radiation underspecification.
Figure 3

2.4. LASERPRODUCT
CLASS I LASER PRODUCT
-ThisequipmentiscertifiedtocomplywithDHHS Rules 21 CFR
Chapter1, SubchapterJineffect as ofdate ofmanufacture. (Only
for U.S.A.)
This equipment is classifiedas a Class I (Class 1)level LASER Productand there is no
hazardous LASER radiation with the safetyprotection.
Caution:
Use ofcontrolsor adjustments or performance ofprocedures other
thanthose specifiedhereinmayresultinhazardousradiation
exposure.
Nevertouchthe internal parts inorderto avoidEXPOSURETOVISIBLELASER RADIATION.
Unplug the AC powercordto the equipment whenopening the top cover.
Whenthe powerswitchis On, do not place youreyes close to the front panel opening dooror
the otheropenings to look into the interiorunit.
LASER Specification
Class I level ALASER Product(Class 1 level ALASER Product)
WaveLength:
647 -677 nm (at DVD)
775 -815 nm (at CD)
LaserPower:
Nohazardousradiation isemittedwiththesafetyprotection.
2.5. PRECAUTIONOFLASERDIODE
CAUTION:
Thisunitutilizes aclass III alaser. Visiblelaserradiation isemitted
from theoptical pickup lenswhentheunitisturnedon:
1. Donotlookdirectlyintothepickup lens.
2. Donotuse optical instruments tolookat thepickup lens.
3. Donotadjust thepreset variableresistor on theoptical pickup.
4. Donotdisassembletheoptical pickup unit.
5. Iftheoptical pickup isreplaced, use themanufactures specified
replacementpickup only.
6. Use ofcontrol or adjustmentor performance ofprocedures other
thanthose specifiedhereinmayresultinhazardousradiation
exposure.

3. PREVENTIONOF ELECTROSTATICDISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES
Some semiconductor(solidstate)devices canbe damagedeasilybystatic electricity. Such
components commonlyare calledElectrostaticallySensitive (ES)Devices. Examples of typical
ES devices are integratedcircuits and some field-effecttransistors are semiconductor"chip"
components. The following techniques shouldbe usedto helpreduce the incidence of
component damage causedbyelectrostatic discharge (ESD).
1. Immediatelybeforehandling anysemiconductor componentor
semiconductor-equippedassembly, drainoff anyESDon your
bodytouching aknownearthground. Alternatively, obtainand
wearacommerciallyavailabledischarging ESDwrist strap, which
shouldberemovedfor potential shock reasonsprior toapplying
powertotheunitundertest.
2. Afterremoving anelectrical assemblyequippedwithES devices,
place theassemblyon aconductivesurface suchas aluminum
foil, topreventelectrostaticchargebuildup or exposureofthe
assembly.
3. Use onlyagrounded-tipsoldering iron tosolderor unsolderES
devices.
4. Use onlyananti-staticsolderremoval device. Somesolder
removal devices notclassifiedas "anti-static(ESDprotected)"
cangenerate electrical chargesufficienttodamageES devices.
5. Donotuse freon-propelledchemicals. These cangenerate
electrical charges sufficienttodamageES devices.
6. DonotremoveareplacementES device from its protective
packageuntil immediatelybeforeyou arereadytoinstall it. (Most
replacementES devices arepackagedwithleadselectrically
shortedtogetherbyconductivefoam, aluminum foil or
comparableconductivematerial).
7. Immediatelybeforeremoving theprotectivematerial from the
leadsofareplacementES device, touchtheprotectivematerial to
thechassisor circuitassemblyintowhichthedevice will be
installed.
CAUTION:

Besureno powerisappliedtothechassisor circuit, and observe
all othersafetyprecautions.
8. Minimizebodilymotionswhenhandling unpackagedreplacement
ES devices. (Otherwise harmless motion suchas thebrushing
togetherofyour clothes fabricor thelifting ofyour footfrom a
carpetedfloor cangenerate staticelectricity(ESD) sufficientto
damageanES device).
"NOTEto CATVsysteminstaller:
Thisreminderisprovidedtocall theCATV systeminstaller’s
attention toArticle820-40 oftheNECthat provides guidelines for
propergrounding and, inparticular, specifies that thecableground
shall beconnectedtothegrounding systemofthebuilding, as
close tothepointofcableentryas practical."
4. OPERATIONGUIDE
5. SERVICE NOTES (PLEASE READ)
5.1. SERVICE NOTES
5.1.1. SIMPLIFIEDFAULT FINDINGDATA
SimplifiedSelf-Diagnostic Systemfacilitates finding the cause of the fault. Communication forI2
C bus code will be displayedon TVscreen.
The SimplifiedFaultfinding data is storedinthe MemoryIC (IC6004). This data is clearedafterit
is displayed, and thenthe POWER button is pressedback on.
1. Withpowerturnedoff, press PLAY and SKIP+buttonson theunit
togetherfor over3seconds. Fig. 1-1
2. TV powercomes on and theunitgoes intoservice mode.
Communication for I2Cbuscodewill bedisplayed.
Fig. 1-2

Fig. 1-3
3. Press anyoperation button exceptfor POWER, CH UP, CH DOWN,
LIGHTor DSS CABLE buttonson eithertheunit, or theremote to
detect that akeyhas beenpressed. "0"will bedisplayedonly
whenkeyisdetected.
Fig. 1-4
5.1.2. SELF-DIAGNOSTICTEST FUNCTIONFORDVD
This unithas a Self-Diagnostic function whichdetects a problemormalfunction withinthe unit
and displays its corresponding Errorcode on TVScreen.
Note:
If, afterapprox. 30 seconds, aunitset toDVDmodeautomatically
switches toTV mode, thereislikelyaproblemwiththeDVD
DecoderC.B.A. (IC8000, IC8100, IC8200, etc.)

5.1.2.1. Howto enterDVD Self-Diagnostic mode
1. InsertaDVDdisc intotheDVDUnit.
2. Set theunittoDVDmode. Then, press STOP button tostop
playback.
Note:
Donotlet aDVDplayduring DVDSelf-Diagnosticmode.
3. Press and holdSTOP, SKIP+, and VOL-buttonsofoperation
panel on theunittogetherfor over5secondswithno cassette
inserted. Theadjustmentoverlaywill appearon theTV screen.
Fig. 2-1
4. Press DISPLAY keyon theremote control toenterDVDSelf-
Diagnosticmode. Fig. 2-2
5. Press ”1”keyon theremote control. TheDVDSelf-Diagnostic
Test function will startautomatically.
Fig. 2-3
6. Afterafewminutes (approx. 1~5minutes), thecheck results will
appearon TV screen.
-Ifno error isdetected, "COMPLETED"will appearas shown
inFig. 2-4. Besuretopress PowerOFF toend. Then, press
PowerONagainand removeaDVDfrom theDVDUnit.
Fig. 2-4

-Ifsomeerror isdetected, 2digitfor Error Codewill appearas
showninFig. 2-5. Fig. 2-5
Fig. 2-6
5.1.3. HOWTOUPDATETHEFIRMWAREOFDVD
Itis possible to update the firmware version of the DVD Drive and the DVD Decoderusing each
Firmware Disc forDVD Drive and DVD Decoder.
5.1.3.1. Howto update the firmware of DVD:
1. Confirm thefirmwareversion ofDVDDrive. Referto"SELF-
DIAGNOSTIC TEST FUNCTION FOR DVD."
2. Set theunittoDVDmode.
3. Press OPEN/CLOSE button toopenthetray. Then, place the
FirmwareDisc for DVDDriveinthetray.
4. Close thetray. Updating will beginautomatically.
5. Afterapprox. 1minute, thetraywill openautomatically.
Note:
Ifthetrayhas still notopenedafter3minutes or Error Indication
appears, updating was unsuccessful. Inthiscase, repeat above
stepsfrom step1.
6. RemovetheFirmwareDisc from thetray. Then, disconnect theAC
Plug. (Thetraywill notclose.)

7. Connect theACPlug and turn on thepower. Then, reset all
memory. Referto"HOW TO RESET ALL COMBINATION TV/DVD
MEMORY FUNCTIONS."
5.1.3.2. Howto update the firmware of DVD Decoder:
1. Confirm thefirmwareversion ofDVDDecoder. Referto"SELF-
DIAGNOSTIC TEST FUNCTION FOR DVD."
2. Set theunittoDVDmode.
3. Press OPEN/CLOSE button toopenthetray. Then, place the
FirmwareDisc for DVDDecoderinthetray.
4. Close thetray. Updating will beginautomatically.
5. Afterapprox. 1minute, thetraywill openautomatically.
Note:
Ifthetrayhas still notopenedafter3minutes or Error Indication
appears, updating was unsuccessful. Inthiscase, repeat above
stepsfrom step1.
6. RemovetheFirmwareDisc from thetray. Then, disconnect theAC
Plug. (Thetraywill notclose.)
7. Connect theACPlug and turn on thepower. Then, reset all
memory. Referto"HOW TO RESET ALL COMBINATION TV/DVD
MEMORY FUNCTIONS."
CAUTION:
1. Donotunplug theACCord during updating.
2. Donotpress anybuttonsduring updating.
5.1.4. USAGE SCREENMODE
Function displayedon the TVmonitor:
-thetotal elapsed"Poweron" time(indays)
-thetotal elapsed"DVDplay"time(inhours).
1. Withpowerturned, press STOP button ofoperation panel on the
unitand 7keyon theremote together.
TheUSAGE SCREENwill bedisplayedon theTV Monitor ofthe
unit.
Fig. 3

Note:
1. Afterreplacing theDVDUnit, press ADD/DLTbutton on remote in
thismode. OnlyTotal elapsedtime"DVDPlay"time(inhours) will
beclearedto0.
2. Torelease from UsageScreenMode, press anyoperation button
or insertacassette tapeinthismode. Theunitwill return to
normal operation mode.
5.1.5. GROUNDINGFORELECTROSTATICBREAKDOWN
Prevention
1. Humanbodygrounding
Use theantistaticwrist straptodischargethestaticelectricity
from your body.
2. Worktablegrounding
Putaconductivematerial (sheet) or steel sheet on thearea where
theoptical pickup isplacedand ground thesheet.
Caution:
Thestaticelectricityofyour clothes will notbegroundedthrough
thewrist strap. Sotake carenottolet your clothes touchthe
optical pickup. Fig. 4
5.1.6. DVDDECODERC.B.A. REPLACEMENT NOTE
Afterreplacing DVD DecoderC.B.A. orEEPROMIC (IC8001), confirmthe Firmware version of
DVD using Self-Diagnostic function. Ifthe version is different thanthatindicatedon the
Firmware Disc, update itusing the Firmware Disc. Referto "HOW TO UPDATE THE FIRMWARE
OF DVD."
5.1.7. METHODFOREJECTINGTHEDVDTRAYMANUALLY

1. InsertaStraightenedPaperClipor similarobject intotheEject
hole.
2. Press itgently, and thenpull theTrayfullyout.
Fig. 5
5.1.8. SERVICEPOSITION
5.1.8.1. Service Position
CAUTION:
HOTCIRCUIT(Primarycircuit) exists on theTV MainC.B.A. and the
MainC.B.A.
Use extremecaretopreventaccidental shock whenservicing.
5.1.8.1.1. Service Position (1)
1. RemovetheRearCoverand theDVDAss'y.
2. RemovethePCB HolderPiece from theBottom Frame.
Fig. 6-1-1
3. InordertostabilizetheTV MainC.B.A. and theTunerMainC.B.A.,
attachthePCB HolderPiece totheC.B.A.s.
Fig. 6-1-2

5.1.8.1.2. Service Position (2)
Fig. 6-2
Note:
1. Place thetapebetweentheBottom Frameand theC.B.A.
5.1.8.1.3. Service Position (3)
InService Position (3), the DVD DecoderC.B.A. with Extension Cable (LSUA0034)X3 and
ConnectorCable (IDECable)(Not supplied) canbe performed.
Fig. 6-3-1

1. RemovetheDVDUnitand theDVDDecoderC.B.A.
Note:
Removetheoriginal Connector Cable(IDE)from theDVDUnit.
(Theoriginal Connector Cable(IDE)isnotusedinthisposition.)
2. Connect theConnector Cable(Power)and theConnector Cable
(IDE Cable) totheDVDUnitfrom theDVDDecoderC.B.A.
3. Connect the3Extension Cables as follows:
-WithExtension Cable(LSUA0034):P8001 on theDVD
DecoderC.B.A. toP1502 on theMainC.B.A.
-WithExtension Cable(LSUA0034):P8002 on theDVD
DecoderC.B.A. toP4004 on theMainC.B.A.
-WithExtension Cable(LSUA0034):P8003 on theDVD
DecoderC.B.A. toP6002 on theMainC.B.A.
4. Place theDVDUnitand DVDDecoderC.B.A. as shown.
Fig. 6-3-2

5.1.9. HOT CIRCUIT
Primarycircuitexists on the the TVMainC.B.A. and the MainC.B.A.
This circuitis identifiedas "HOT"on the C.B.A. and inthe Service Manual. Use extreme care to
prevent accidental shock whenservicing.
5.1.10. WIREAND LEADPOSITIONDIAGRAM
Fig. 7

5.1.11. HOWTORESET ALL COMBINATIONTV/DVDMEMORYFUNCTIONS
Toreset(clear)the selectlanguage, channel auto setand setclock functions to theirinitial
poweron condition (poweron), holddownthe PLAYand SKIP-buttons of operation panel on
the unittogetherformore than5 seconds.
Powerwill shut off.
5.1.12. HOWTOCONFIRM AUTOCLOCK SET FEATURE
1. Connect anRFcablefrom theoutputofoneunittotheinputof
thetest unit.
2. Select corresponding RFchannels.
3. Playback arecording ofP.B.S. channel including clock set data
and confirm thisfeature.

5.1.13. VARIABLEVOLTAGE ISOLATIONTRANSFORMER
AnIsolation Transformershouldalways be usedduring the servicing of Combination TV/DVD
whose chassis is not isolatedfrom the AC powerline. Use a transformerof adequate power
rating as this protects the technicianfrom accidents resulting inpersonal injuryfrom electrical
shocks. Itwill alsoprotectCombination TV/DVD from being damagedbyaccidental shorting
thatmayoccurduring servicing.
Also, whentroubleshooting the above type of PowerSupplyCircuit, a variable isolation
transformeris requiredinorderto increase the input voltage slowly.
5.1.14. SPECIALNOTE
All integratedcircuits and manyothersemiconductordevices are electrostaticallysensitive and
therefore require the special handling techniques describedunderthe "ELECTROSTATICALLY
SENSITIVE (ES)DEVICES" section of this service manual.
5.1.15. MODELNO. IDENTIFICATIONMARK
Use Marks showninthe chartbelowto distinguishthe different models includedinthis Service
Manual.
6. DISASSEMBLY/ASSEMBLY PROCEDURES
6.1. CABINETSECTION
6.1.1. DisassemblyFlowchart
Performall disassemblyprocedures inthe orderdescribedinthe "DisassemblyFlowchart"
shownbelow. Whenreassembling, use the reverse procedure.
CAUTION:
Disconnect ACplug beforedisassembly.
Fig. D1