Panasonic NN-C784MF Manuale utente

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ServiceManual

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ORDERNO.SIMMC0408027A3

MicrowaveOven

NNC784MF

NNC784WF

HPE(HongKong)

YPQ(Singapore)

MPQ(Malaysia)

TPE(Thailand,Indonesia)

YTE(Others)

KTE(UAE)

KUE(Egypt)

PTE(Iran)

KPQ(Kuwait,Doha,Qatar,Oman,Bahrain,Pakistan)

STM(SaudiArabia)

ZPE(CISCountries)

PleasefileandusethismanualtogetherwiththeservicemanualforModelNNC781JF(ORDERNO.SIMMC0110022C3).

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©2004PanasonicHomeAppliancesMicrowaveOven(Shanghai)Co.,Ltd.

Allrightsreserved.Unauthorizedcopyinganddistributionisaviolationoflaw.

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1SCHEMATICDIAGRAM

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1.1NNC784MF/WF(EXCEPTZPE)

1.2NNC784MF(ZPE)

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2CAUTIONSTOBEOBSERVEDWHEN

TROUBLESHOOTING

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Unlikemanyotherappliances,themicrowaveovenisahighvoltage,highcurrentdevice.Itisfreefromdanger

inordinaryuse,thoughextremecareshouldbetakenduringrepair.

Caution

Servicemenshouldremovetheirwatcheswheneverworkingclosetoorreplacingthemagnetron.

2.1Checkthegrounding

2.2Inverterwarnings

2.3Partreplacement.

2.4Whenthe10Afuseisblownduetotheoperationoftheshortswitch:

2.5Avoidinsertingnails,wireetc.throughanyholesintheunitduringoperation.

2.6Confirmafterrepair

2.7Sharpedges

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2.2Inverterwarnings

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DANGER,HIGHVOLTAGEANDHIGHTEMPERATURE(HOT/LINE)OFTHE

INVERTERPOWERSUPPLY(U)

Thishighvoltageinverterpowersupplyhandlesveryhighvoltageandcurrentforthemagnetrontube.Thoughit

isfreefromdangerinordinaryuse,extremecareshouldbetakenduringrepair.

Thealuminumheatsinkisalsoenergizedwithhighvoltage(HOT),sodonottouchwhentheACinput

terminalsareenergized.ThepowerdevicesCollectorisdirectlyconnectedtothealuminumheatsink.

ThealuminumheatsinkmaybeHOTduetoheatenergy,therefore,extremecareshouldbetakenduring

servicing.

H.V.Inverterwarning

WARNINGFORINVERTERPOWERSUPPLY(U)GROUNDING

Checkthehighvoltageinverterpowersupplycircuitgrounding.Thehighvoltageinverterpowersupplycircuit

boardmusthaveaproperchassisground,theinvertergroundingbracketmustbeconnectedtothechassis.Ifthe

inverterboardisnotgroundeditwillexposetheusertoveryhighvoltagesandcauseextremeDANGER!Be

surethattheinvertercircuitisproperlygroundedviatheinverterearthbracket.

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Groundingoftheinvertercircuitboard

WARNING!DISCHARGETHEHIGHVOLATGECAPACITORS

Forabout30secondsaftertheovenisturnedoff,anelectricchargeremainsinthehighvoltagecapacitorsinthe

inverterpowersupplycircuitboard.

Whenreplacingorcheckingparts,removethepowerplugfromtheoutletandshorttheinverteroutputterminal

ofthemagnetronfilamentterminalstothechassisgroundwithaninsulatedhandlescrewdrivertodischarge.

Pleasebesuretotouchthechassisgroundsidefirstandthenshorttotheoutputterminals.

Dischargingthehighvoltagecapacitors

WARNING

Thereishighvoltagepresentwithhighcurrentcapabilitiesinthecircuitsoftheprimaryandsecondary

windings,chokecoilandheatsinkoftheinverter.Itisextremelydangeroustoworkonornearthesecircuits

withtheovenenergized.DONOTmeasurethevoltageinthehighvoltagecircuitincludingthefilamentvoltage

ofthemagnetron.

WARNING

Nevertouchanycircuitwiringwithyourhandorwithaninsulatedtoolduringoperation.

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2.3Partreplacement.

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Whenanypartorcomponentistobereplaced,alwaysensurethatthepowercordisremovedfromthewall

outlet.

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