Panasonic PV-DF2700-K User manual

ORDERNO. MKE0012601C1
B6
TV/DVD/VCR Combination
PV-DF2700-K
SPECIFICATIONS
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1. SAFETYPRECAUTIONS
1.1. GENERAL GUIDELINES
1. IMPORTANTSAFETY NOTICE
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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
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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
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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.
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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.
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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)
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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.
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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
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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
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