Panasonic PV 20DF62 Manuale utente

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.)

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