Panasonic PV-DF2700-K Manuale utente

ORDERNO. MKE0012601C1

TV/DVD/VCR Combination

PV-DF2700-K

SPECIFICATIONS

1. SAFETYPRECAUTIONS

1.1. GENERAL GUIDELINES

1. IMPORTANTSAFETY NOTICE

Therearespecial components usedinthisequipmentwhichareimportantfor

safety. These parts aremarkedbyintheSchematicDiagrams, CircuitBoard

Layout, ExplodedViewsand ReplacementParts List. Itisessential that these

critical parts shouldbereplacedwithmanufacturer’sspecifiedparts topreventX-

RADIATION, shock, fire, or otherhazards. Donotmodify theoriginal design

withoutpermission ofmanufacturer.

2. AnIsolation Transformershouldalways beusedduring theservicing of

Combination VCR whose chassisisnotisolatedfromtheAC powerline. Use a

transformerofadequate powerrating as thisprotects thetechnicianfrom

accidents resulting inpersonal injuryfromelectrical shocks. Itwill alsoprotect

Combination VCR frombeing damagedbyaccidental shorting that may occur

during servicing.

3. Whenservicing, observe theoriginal leaddress, especiallytheleaddress inthe

high voltagecircuits. Ifashortcircuitisfound, replace all parts whichhave been

overheatedor damagedbytheshortcircuit.

4. Afterservicing, see toitthat all theprotective devices suchas insulation

barriers, insulation papers, shield, and isolation R-C combinationsareproperly

installed.

5. Beforeturning thereceiveron, measuretheresistance betweenB+ lineand

chassisground. Connect (-) sideofanohmmetertotheB+ lines, and (+)sideto

chassisground. Eachlineshouldhave moreresistance thanspecified, as

follows:

B+ Line

MinimumResistance

130 V

1k (Coldchassisground)

27 V

180 (Coldchassisground)

17 V

110 (Coldchassisground)

6. WhentheTV set isnotusedfor along period oftime, unplug thepowercord

fromtheAC outlet.

7. Potentials, as high as 34.5kV arepresentwhenthisTV set isinoperation.

Operation oftheTV set withouttherearcoverinvolves thedangerofashock

hazard fromtheTV set powersupply. Servicing shouldnotbeattemptedby

anyonewho isnotthoroughlyfamiliarwiththeprecautionsnecessarywhen

working on high voltageequipment. Always dischargetheanodeofthepicture

tubetotheCRTground ofreceiverbeforehandling thetube.

8. Afterservicing make thefollowing leakagecurrentchecks topreventthe

customerfrombeing exposedtoshock hazards.

1.2. LEAKAGECURRENT COLDCHECK

1. Unplug theAC cord and connect ajumperbetweenthetwoprongson theplug.

2. For physicallyoperatedpowerswitches, turn poweron. Otherwise skipstep2.

3. Measuretheresistance value, withanohmmeter, betweenthejumperedAC plug

and eachexposedmetalliccabinet parton thereceiver, suchas screwheads,

connectors, etc. Whentheexposedmetallicparthas areturn pathtothechassis,

thereading shouldbebetween1M and 12 M . Whentheexposedmetal does

nothave areturn pathtothechassis, thereading must beinfinity.

1.3. LEAKAGECURRENT HOT CHECK

1. Plug theAC cord directlyintotheAC outlet.

Donotuse aisolation transformerfor thischeck.

2. Connect a1.5k , 10 Wresistor, inparallel witha0.15 Fcapacitor, between

eachexposedmetallicparton theset and agood earthground, as shownin

Figure1.

3. Use anAC voltmeter, with1k /V or moresensitivity, tomeasurethepotential

across theresistor.

4. Check eachexposedmetallicpart, and measurethevoltageat eachpoint.

5. Reverse theAC plug intheAC outlet and repeat eachoftheabove measurements.

6. Thepotential at anypointshouldnotexceed0.75 V RMS.

Aleakagecurrenttester(Simpson Model 229 equivalent) may beusedtomake

thehotchecks. Leakagecurrentmust notexceed1/2mA. Incase ameasurement

isoutsideofthelimits specified, thereisapossibility ofshock hazard, and the

receivershouldberepairedand recheckedbeforeitisreturnedtothecustomer.

Figure1

2. X-RADIATION

WARNING:

1. Thepotential source ofX-Radiation inTV sets istheHigh Voltagesection and the

picturetube.

2. Whenusing apicturetubetest fixturefor service, ensurethat thefixtureis

capableofhandling 34.5kV withoutcausing X-Radiation.

NOTE:

Itisimportanttouse anaccurate periodicallycalibratedhigh voltagemeter.

1. Reduce thebrightness tominimum.

2. Set theSERVICE switchtoSERVICE .

3. MeasuretheHigh Voltage. Themeterreading shouldindicate 32.0kV±2.5kV.

Ifthemeterindication isoutoftolerance, immediate service and correction is

requiredtopreventthepossibility ofprematurecomponentfailure.

4. To preventanX-Radiation possibly, itisessential touse thespecifiedpicture

tube.

2.1. HORIZONTAL OSCILLATORDISABLECIRCUIT TEST

SERVICE WARNING:

Thetest must bemadeas afinal check beforeset isreturnedtothecustomer.

1. Withtherearcoverremoved, supplyabouta120 V AC powersource totheset,

turn on theset.

2. Set thecustomercontrolstonormal operating positions.

3. ShortbetweenTP891 and TP892 on theMaincircuitboard withajumperwire.

Confirmthat thepicturegoes outofhorizontal sync.

4. Ifthisdoes notoccur, thehorizontal oscillator disablecircuitisnotoperating.

FollowtheRepairProcedures ofhorizontal oscillator disablecircuitbeforethe

set isreturnedtocustomer.

2.2. REPAIRPROCEDURES OF HORIZONTAL OSCILLATOR

DISABLECIRCUIT

1. Connect aDC voltmeterbetweencapacitor C513 (+)on theMaincircuitboard and

chassisground.

2. Ifapproximately+21.5V isnotpresentat that pointwhen120 V AC isapplied,

find thecause. Check R503, R5505, C5507, C513 and D503.

3. Carefullycheck above specifiedparts and relatedcircuits and parts. Whenthe

circuitisrepaired, trythehorizontal oscillator disablecircuittest again.

2.3. CIRCUIT EXPLANATION

2.3.1. HORIZONTALOSCILLATORDISABLECIRCUIT

Thepositive DC voltage, suppliedfromtheD503 cathodefor monitoring high

voltage, isappliedtotheIC5301 Pin11 through R503 and R5504. Undernormal

conditions, thevoltageat IC5301 Pin11 isless thanapprox. 3V. Ifthehigh voltage

at Flyback TransformerPin5exceedsthespecifiedvoltage, thepositive DC voltage

whichissuppliedfromtheD503 cathodealsoincreases. Theincreasedvoltageis

appliedtoIC5301 Pin11 through R503 and R5504. Duetotheincreasedvoltageat

IC5301 Pin11, thehorizontal oscillator frequency increases, thepicturegoes outof

horizontal sync, thebeamcurrentdecreases and thepicturebecomedarkinorder

tokeepX-radiation underspecification.

Figure2

2.4. LASERPRODUCT

CLASS ILASERPRODUCT

- ThisequipmentiscertifiedtocomplywithDHHS Rules 21 CFRChapter1,

SubchapterJineffect as ofdate ofmanufacture. (Onlyfor U.S.A.)

Thisequipmentisclassifiedas aClass I(Class 1) level LASERProduct and thereis

no hazardousLASERradiation withthesafety protection.

Caution:

Use ofcontrolsor adjustments or performance ofprocedures otherthanthose

specifiedhereinmay resultinhazardousradiation exposure.

Danger:

Theservicemanshouldnotremove thecoverofdrive unitand shouldnotservice

because thedrive unitisanon-serviceableparts. Please check that thelabels

showninFig. D3on thebottomofthedrive unit.

Nevertouchtheinternal parts inordertoavoidEXPOSURE TOVISIBLE LASER

RADIATION.

Unplug theAC powercord totheequipmentwhenopening thetop cover.

WhenthepowerswitchisOn, do notplace your eyes close tothefrontpanel

opening door or theotheropeningstolookintotheinterior unit.

LASERSpecification

Class Ilevel ALASERProduct (Class 1level ALASERProduct)

Wave Length:

660 -675 nm(at DVD)

775 -815 nm(at CD)

LaserPower:

Nohazardousradiation isemittedwiththesafety protection.

2.5. PRECAUTIONOF LASERDIODE

CAUTION:

Thisunitutilizes aclass II laser. Visiblelaserradiation isemittedfromtheoptical

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 specifiedreplacement

pickup only.

6. Use ofcontrol or adjustmentor performance ofprocedures otherthanthose

specifiedhereinmay resultinhazardousradiation exposure.

3. PREVENTIONOFELECTROSTATICDISCHARGE

(ESD) TO ELECTROSTATICALLYSENSITIVE (ES)

DEVICES

Somesemiconductor (solidstate) devices canbedamagedeasilybystatic

electricity. Suchcomponents commonlyarecalledElectrostaticallySensitive (ES)

Devices. Examples oftypical ES devices areintegratedcircuits and somefield-

effect transistorsaresemiconductor "chip"components. Thefollowing techniques

shouldbeusedtohelpreduce theincidence ofcomponentdamagecausedby

electrostaticdischarge(ESD).

1. Immediatelybeforehandling anysemiconductor componentor semiconductor-

equippedassembly, drainoff anyESDon your bodytouching aknownearth

ground. Alternatively, obtainand wearacommerciallyavailabledischarging ESD

wrist strap, whichshouldberemovedfor potential shock reasonsprior to

applying powertotheunitundertest.

2. Afterremoving anelectrical assemblyequippedwithES devices, place the

assemblyon aconductive surface suchas aluminumfoil, topreventelectrostatic

chargebuildup or exposureoftheassembly.

3. Use onlyagrounded-tipsoldering iron tosolderor unsolderES devices.

4. Use onlyananti-staticsolderremoval device. Somesolderremoval devices not

classifiedas "anti-static(ESDprotected)"cangenerate electrical charge

sufficienttodamageES devices.

5. Donotuse freon-propelledchemicals. These cangenerate electrical charges

sufficienttodamageES devices.

6. Donotremove areplacementES device fromits protective packageuntil

immediatelybeforeyou arereadytoinstall it. (Most replacementES devices are

packagedwithleadselectricallyshortedtogetherbyconductive foam, aluminum

foil or comparableconductive material).

7. Immediatelybeforeremoving theprotective material fromtheleadsofa

replacementES device, touchtheprotective material tothechassisor circuit

assemblyintowhichthedevice will beinstalled.

CAUTION:

Besureno powerisappliedtothechassisor circuit, and observe all othersafety

precautions.

8. Minimizebodilymotionswhenhandling unpackagedreplacementES devices.

(Otherwise harmless motion suchas thebrushing togetherofyour clothes fabric

or thelifting ofyour footfromacarpetedfloor cangenerate staticelectricity

(ESD) sufficienttodamageanES device).

"NOTEtoCATVsysteminstaller:

Thisreminderisprovidedtocall theCATV systeminstaller’sattention toArticle

820-40 oftheNECthat provides guidelines for propergrounding and, inparticular,

specifies that thecableground shall beconnectedtothegrounding systemofthe

building, as close tothepointofcableentryas practical."

4. OPERATIONGUIDE

5. SERVICE NOTES (PLEASE READ)

5.1. SERVICENOTES

5.1.1. SIMPLIFIEDFAULT FINDING DATA

SimplifiedSelf-DiagnosticSystemfacilitates finding thecause ofthefault. A4digit

faultcodeand communication for I2Cbuscodewill bedisplayedon TV screen.

TheSimplifiedFaultfinding data isstoredintheMemoryIC(IC6004). Thisdata is

clearedafteritisdisplayed, and thenthePOWERbutton ispressedback on.

1. Withpowerturnedoff, press FF and REWbuttonson unittogetherfor over3

seconds.

Fig. 1-1

2. TV powercomes on and theunitgoes intoservice mode.

4digitfor faultcodeand communication for I2Cbuscodewill bedisplayed.

Fig. 1-2

Indice

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