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.)