Panasonic Omnivision PV-C2540-K User manual

ORDERNO. MKE0002102C1
B6
Combination VCR
PVQ-2510 / PV-C2540 / PV-C2540-K/ PV-C2580 / PV-C2580-K
SPECIFICATIONS
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1. SAFETYPRECAUTIONS
GENERALGUIDELINES
1. IMPORTANTSAFETYNOTICE
Therearespecial components usedinthisequipmentwhichare
importantforsafety. These parts aremarkedby intheSchematic
Diagrams, CircuitBoardLayout, ExplodedViewsand Replacement
Parts List. Itisessential that these critical parts shouldbe
replacedwithmanufacturer'sspecifiedparts topreventX-
RADIATION, shock, fire, orotherhazards. Donotmodifythe
original design withoutpermission ofmanufacturer.
2. AnIsolation Transformershouldalwaysbeusedduring the
servicing ofCombination VCR whose chassisisnotisolatedfrom
theACpowerline. Use atransformerofadequate powerrating as
thisprotects thetechnicianfromaccidents resulting inpersonal
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. Eachlineshouldhavemore
resistance thanspecified, as follows:
B+ Line
MinimumResistance
125 V
1k (Coldchassisground)
27 V
180 (Coldchassisground)
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17 V
110 (Coldchassisground)
6. WhentheTVset isnotusedforalong period oftime, unplug the
powercordfromtheACoutlet.
7. Potentials, as high as 32.0kVarepresentwhenthisTVset isin
operation. Operation oftheTVset withouttherearcoverinvolves
thedangerofashock hazardfromtheTVset powersupply.
Servicing shouldnotbeattemptedbyanyonewho isnot
thoroughlyfamiliarwiththeprecautionsnecessarywhenworking
on high voltageequipment. Alwaysdischargetheanodeofthe
picturetubetotheCRTground ofreceiverbeforehandling the
tube.
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
metallicparthasa returnpathtothechassis, thereading should
bebetween1M and 12 M . Whentheexposedmetal does not
haveareturnpathtothechassis, thereading must beinfinity.
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.
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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 32.0kVwithoutcausing X-Radiation.
NOTE :
Itisimportanttouse anaccurate periodicallycalibratedhigh
voltagemeter.
1. Reduce thebrightness tominimum.
2. Set theSERVICEswitchtoSERVICE.
3. MeasuretheHigh Voltage. Themeterreading shouldindicate 30.0
kV±2.0kV.
Ifthemeterindication isoutoftolerance, immediate service and
correction isrequiredtopreventthepossibilityofpremature
componentfailure.
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4. To preventanX-Radiation possibly, itisessential touse the
specifiedpicturetube.
HORIZONTALOSCILLATORDISABLE CIRCUITTESTSERVICE WARNING:
Thetestmustbemadeas afinal check beforesetisreturnedtothecustomer.
CONFIRMATIONOFX-RAYMOVEMENT
1. Turnoff TVset.
2. Connect thecircuitbelow betweenTP1209 and TP1208.
Figure2
3. Turnon DC Power, and thenturnon theset. Confirm that the
pictureison thescreenproperly.
4. Confirm that thepicturegoes outofhorizontal syncwhilegetting
downthevoltagetoDC Power.
5. Ifthisdoes notoccurevenwhengetting downthevoltageofDC
Powerto0V, itmeansthat X-rayprotect circuitisnotoperating.
Furtherconfirmation and repairisrequired.
REPAIRPROCEDURES OFHORIZONTALOSCILLATORDISABLE CIRCUIT
1. Connect aDC voltmeterbetweencapacitorC513 (+)on theMain
circuitboardand chassisground.
2. Ifapproximately+23.5Visnotpresentat that pointwhen120 VAC
isapplied, find thecause. Check R503, R5505, C5507, C513 and
D503.
3. Carefullycheck abovespecifiedparts and relatedcircuits and
parts. Whenthecircuitisrepaired, trythehorizontal oscillator
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 thanapprox6V. IfthehighvoltageatFlyback TrPin5exceedsthespecifiedvoltage,
thepositive DC voltagewhichissuppliedfrom theD503 cathodealsoincreases. Theincreased
voltageisappliedtoIC5301 Pin11 through R503 and R5504. Duetotheincreasedvoltageat
IC5301Pin11, thehorizontal oscillator frequency increases, thepicturegoes outofhorizontal
sync, thebeam currentdecreases and thepicturebecomes darkinordertokeepX-radiation
underspecification.
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Figure3
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, which
shouldberemovedforpotential shock reasonspriortoapplying
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
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 orcomparable
conductivematerial).
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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 system ofthebuilding, 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
2. TVpowergoes on and theunitgoes intoservice mode.
4digitforfaultcodeand communication forI2Cbuscodewill be
displayed. Fig. 1-2
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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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Note:
When1to4listedinLock codeoccurs, theVCR stopsand all VCR
function buttonsexceptforpowerbecomenon-operational.
5.1.2. SERVICE POSITION
5.1.2.1. Service Position
CAUTION:
HOTCIRCUIT(Primarycircuit) exists on theTV/VCR MainC.B.A.
and theTVPowerC.B.A. Use extremecaretopreventaccidental
shock whenservicing.
5.1.2.1.1. Service Position (1)
Fig. 2-1
5.1.2.1.2. Service Position (2)
Fig. 2-2
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