Panasonic Omnivision PV-C2540-K Bedienungsanleitung

ORDERNO. MKE0002102C1

Combination VCR

PVQ-2510 / PV-C2540 / PV-C2540-K/ PV-C2580 / PV-C2580-K

SPECIFICATIONS

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)

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.

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.

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.

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).

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

Fig. 1-3

Fig. 1-4

Fig. 1-5

3. Press anyoperation button exceptforPOWERon eithertheunit,

ortheremote todetect that akeyhas beenpressed.

The1st digitchanges to"0"onlywhenkeyisdetected.

Fig. 1-6

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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