Panasonic PVQ-1312W User manual

ORDERNO. MKE0202102C1
B3, B6
Combination VCR
PVQ-1312W/ PVQ-2012 / VV-2002 / PVQ-2512 / PV-C2542 / PV
-C1322-K/ PV-C1352W-K/ PV-C2022-K
SPECIFICATIONS
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2002 Matsushita Kotobuki Electronics Industries LTD. All rights
reserved. Unauthorizedcopying and distribution isaviolation of
law.
1. SAFETYPRECAUTIONS
GENERALGUIDELINES
1. IMPORTANTSAFETYNOTICE
Therearespecial components usedinthisequipmentwhichare
importantforsafety. These parts aremarkedbyinthe
SchematicDiagrams, CircuitBoardLayout, ExplodedViewsand
ReplacementParts List. Itisessential that these criticalparts
shouldbereplacedwithmanufacturer'sspecifiedparts toprevent
X-RADIATION, shock, fire, orotherhazards. Donotmodifythe
original design withoutpermission ofmanufacturer.
2. AnIsolation Transformershouldalwaysbeusedduring the
servicing ofCombination VCR whose chassisisnotisolatedfrom
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theACpowerline. Use atransformerofadequate powerrating as
thisprotects thetechnicianfromaccidents resultinginpersonal
injuryfromelectrical shocks. Itwill alsoprotect Combination VCR
frombeing damagedbyaccidental shorting that mayoccurduring
servicing.
3. Whenservicing, observetheoriginal leaddress, especiallythe
leaddress inthehigh voltagecircuits. Ifashortcircuitisfound,
replace all parts whichhavebeenoverheatedordamagedbythe
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 (-) sideofanohmmetertotheB
+lines, and (+)sidetochassisground. Eachlineshouldhave
moreresistance thanspecified,as follows:
(Formodel with13 inchCRT)
B+ Line
MinimumResistance
130.0V
1k (Coldchassisground)
23.5V
180 (Coldchassisground)
13.0V
110 (Coldchassisground)
(Formodel with20 inchCRT)
B+ Line
MinimumResistance
130.0V
1k (Coldchassisground)
21.5V
180 (Coldchassisground)
15.9V
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110 (Coldchassisground)
(Formodel with25 inchCRT)
B+ Line
MinimumResistance
125.0V
1k (Coldchassisground)
27.0V
180 (Coldchassisground)
17.0V
110 (Coldchassisground)
6. WhentheTVset isnotusedforalong period oftime, unplug the
powercordfromtheACoutlet.
7. Potentials, as high as 25.0kV(Formodel with13 inchCRT)or30.0
kV(Formodel with20 inchCRT)or32.0kV(Formodel with25
inchCRT)arepresentwhenthisTVset isinoperation. Operation
oftheTVset withouttherearcoverinvolvesthedangerofashock
hazardfromtheTVset powersupply. Servicing shouldnotbe
attemptedbyanyonewho isnotthoroughlyfamiliarwiththe
precautionsnecessarywhenworking on high voltageequipment.
AlwaysdischargetheanodeofthepicturetubetotheCRTground
ofreceiverbeforehandling thetube.
8. Afterservicing make thefollowing leakagecurrentchecks to
preventthecustomerfrombeing exposedtoshock hazards.
LEAKAGE CURRENTCOLDCHECK
1. Unplug theACcordand connect ajumperbetweenthetwoprongs
on theplug.
2. Forphysicallyoperatedpowerswitches, turnpoweron. Otherwise
skipstep2.
3. Measuretheresistance value, withanohmmeter, betweenthe
jumperedACplug and eachexposedmetalliccabinet parton the
receiver, suchas screwheads, connectors, etc. Whentheexposed
metallicparthas areturnpathtothechassis, thereadingshould
bebetween1M and 12 M . Whentheexposedmetal does not
haveareturnpathtothechassis, thereading must beinfinity.
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LEAKAGE CURRENTHOTCHECK
1. Plug theACcorddirectlyintotheACoutlet.
Donotuse aisolation transformerforthischeck.
2. Connect a1.5k , 10 Wresistor, inparallel witha0.15 F
capacitor, betweeneachexposedmetallicparton theset and a
good earthground , as showninFigure1.
3. Use anACvoltmeter, with1k /Vormoresensitivity, tomeasure
thepotential across theresistor.
4. Check eachexposedmetallicpart, and measurethevoltageat
eachpoint.
5. Reverse theACplug intheACoutlet and repeat eachoftheabove
measurements.
6. Thepotential at anypointshouldnotexceed0.75 VRMS.
Aleakagecurrenttester(Simpson Model 229 equivalent) maybe
usedtomake thehotchecks. Leakagecurrentmust notexceed1/2
mA. Incase ameasurementisoutsideofthelimits specified, there
isapossibilityofshock hazard, and thereceivershouldbe
repairedand recheckedbeforeitisreturnedtothecustomer.
Figure1
2. X-RADIATION
WARNING:
1. Thepotential source ofX-Radiation inTVsets istheHigh Voltage
section and thepicturetube.
2. Whenusing apicturetubetest fixtureforservice, ensurethat the
fixtureiscapableofhandling 25.0kV(Formodel with13 inchCRT)
or30.0kV(Formodel with20 inchCRT)or32.0kV(Formodel with
25 inchCRT)withoutcausing X-Radiation.
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NOTE :
Itisimportanttouse anaccurate periodicallycalibratedhigh
voltagemeter.
1. Reduce thebrightness tominimum.
2. Set theSERVICEswitchtoSERVICE.
3. MeasuretheHigh Voltage. Themeterreading shouldindicate 23.5
kV±1.5kV(Formodel with13 inchCRT)or28.5kV±1.5kV(For
model with20 inchCRT)or30.0kV±2.0kV(Formodel with25 inch
CRT).
Ifthemeterindication isoutoftolerance, immediate service and
correction isrequiredtopreventthepossibilityofpremature
componentfailure.
4. To preventanX-Radiation possibly, itisessential touse the
specifiedpicturetube.
HORIZONTALOSCILLATORDISABLE CIRCUITTEST
SERVICE WARNING:
Thetestmustbemadeas afinal check beforesetisreturnedtothecustomer.
1. Withtherearcoverremoved, supplyabouta90 VACpower
source totheset, turnon theset.
2. Set thecustomercontrolstonormal operating positions.
3. Shortbothsides ofR804 on theMaincircuitboardwithajumper
wire. Confirm that thepicturegoes outofhorizontal sync.
4. Ifthisdoes notoccur, thehorizontal oscillatordisablecircuitis
notoperating. Follow theRepairProcedures ofhorizontal
oscillatordisablecircuitbeforetheset isreturnedtocustomer.
REPAIRPROCEDURES OFHORIZONTALOSCILLATORDISABLE CIRCUIT
1. Connect aDC voltmeterbetweencapacitorC513 (+)on theMain
circuitboardand chassisground.
2. Ifapproximately+21.0V(Formodel with13 inchCRT)or+21.9V
(Formodel with20 inchCRT)or+23.5V(Formodel with25 inch
CRT)isnotpresentat that pointwhen120 VACisapplied, find the
cause. Check R503,R5505, C5507, C513 and D503.
3. Carefullycheck abovespecifiedparts and relatedcircuits and
parts. Whenthecircuitisrepaired, trythehorizontal oscillator
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disablecircuittest again.
CIRCUITEXPLANATION
HORIZONTALOSCILLATORDISABLE CIRCUIT
Thepositive DC voltage, suppliedfrom theD503 cathodefor monitoring high voltage, isapplied
totheIC5301 Pin11 through R503 and R5504. Undernormal conditions, thevoltageatIC5301 Pin
11 isless thanapprox3V. Ifthehigh voltageatFlybackTrPin5exceedsthespecifiedvoltage,
thepositive DC voltagewhichissuppliedfrom theD503 cathodealsoincreases. Theincreased
voltageisappliedtoIC5301 Pin11 through R503 and R5504. Duetotheincreasedvoltageat
IC5301 Pin11, thehorizontaloscillator frequency increases, thepicturegoes outofhorizontal
sync, thebeam currentdecreases and thepicturebecomes darkinordertokeepX-radiation
underspecification.
Figure2
3. PREVENTIONOFELECTROSTATICDISCHARGE
(ESD) TO ELECTROSTATICALLYSENSITIVE (ES)
DEVICES
Somesemiconductor (solidstate)devices canbedamagedeasilybystaticelectricity. Such
componentscommonlyarecalledElectrostaticallySensitive (ES)Devices. Examples oftypical
ES devices areintegratedcircuitsand somefield-effecttransistorsaresemiconductor "chip"
components. Thefollowing techniques shouldbeusedtohelpreduce theincidence of
componentdamagecausedbyelectrostaticdischarge(ESD).
1. Immediatelybeforehandling anysemiconductorcomponentor
semiconductor-equippedassembly, drainoff anyESDon your
bodytouching aknownearthground. Alternatively, obtainand
wearacommerciallyavailabledischarging ESDwrist strap,
whichshouldberemovedforpotential shock reasonspriorto
applying powertotheunitundertest.
2. Afterremoving anelectrical assemblyequippedwithES devices,
place theassemblyon aconductivesurface suchas aluminum
foil, topreventelectrostaticchargebuildup orexposureofthe
assembly.
3. Use onlyagrounded-tipsoldering iron tosolderorunsolderES
devices.
4. Use onlyanantistaticsolderremoval device. Somesolderremoval
devices notclassifiedas "antistatic(ESDprotected)"cangenerate
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electrical chargesufficienttodamageES devices.
5. Donotuse freon-propelledchemicals. These cangenerate
electrical charges sufficienttodamageES devices.
6. DonotremoveareplacementES device fromits protective
packageuntil immediatelybeforeyou arereadytoinstall it. (Most
replacementES devices arepackagedwithleadselectrically
shortedtogetherbyconductivefoam, aluminumfoil or
comparableconductivematerial).
7. Immediatelybeforeremoving theprotectivematerial fromthe
leadsofareplacementES device, touchtheprotectivematerial to
thechassisorcircuitassemblyintowhichthedevice will be
installed.
CAUTION:
Besureno powerisappliedtothechassisorcircuit, and observe
all othersafetyprecautions.
8. Minimizebodilymotionswhenhandling unpackagedreplacement
ES devices. (Otherwise harmless motion suchas thebrushing
togetherofyourclothes fabricorthelifting ofyourfootfroma
carpetedfloorcangenerate staticelectricity(ESD)sufficientto
damageanES device).
"NOTE toCATV system installer:
Thisreminderisprovidedtocall theCATV system installer's attention toArticle820-40 ofthe
NECthatprovides guidelines for propergrounding and, inparticular, specifies thatthecable
ground shall beconnectedtothegrounding systemofthebuilding, as close tothepointofcable
entryas practical."
4. OPERATIONGUIDE
5. SERVICE NOTES (PLEASE READ)
5.1. SERVICENOTES
5.1.1. SIMPLIFIEDFAULT FINDINGDATA
SimplifiedSelf-DiagnosticSystem facilitates finding thecause ofthefault. A4digitfor faultcode
and communication for I2Cbuscodewill bedisplayedon TV screen.
TheSimplifiedFaultfinding dataisstoredintheMemoryIC(IC6004). Thisdataisclearedafterit
isdisplayed, and thenthePOWERbutton ispressedback on.
1. Withpowerturnedoff, press FF and REW buttonson unittogether
forover3seconds. Fig. 1-1
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2. TVpowergoes on and theunitgoes intoservice mode. 4digitfor
faultcodeand communication forI2Cbuscodewill bedisplayed.
Fig. 1-2
Fig. 1-3
Fig. 1-4
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Fig. 1-5
3. Press anyoperation button exceptforPOWERon eithertheunit,
ortheremote todetect that akeyhas beenpressed.
The1st digitchanges to"0"onlywhenkeyisdetected.
Fig. 1-6
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