Panasonic NN-C784MF Manuel utilisateur
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ServiceManual
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ORDERNO.SIMMC0408027A3
MicrowaveOven
NNC784MF
NNC784WF
HPE(HongKong)
YPQ(Singapore)
MPQ(Malaysia)
TPE(Thailand,Indonesia)
YTE(Others)
KTE(UAE)
KUE(Egypt)
PTE(Iran)
KPQ(Kuwait,Doha,Qatar,Oman,Bahrain,Pakistan)
STM(SaudiArabia)
ZPE(CISCountries)
PleasefileandusethismanualtogetherwiththeservicemanualforModelNNC781JF(ORDERNO.SIMMC0110022C3).
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©2004PanasonicHomeAppliancesMicrowaveOven(Shanghai)Co.,Ltd.
Allrightsreserved.Unauthorizedcopyinganddistributionisaviolationoflaw.
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2CAUTIONSTOBEOBSERVEDWHEN
TROUBLESHOOTING
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Unlikemanyotherappliances,themicrowaveovenisahighvoltage,highcurrentdevice.Itisfreefromdanger
inordinaryuse,thoughextremecareshouldbetakenduringrepair.
Caution
Servicemenshouldremovetheirwatcheswheneverworkingclosetoorreplacingthemagnetron.
2.1Checkthegrounding
2.2Inverterwarnings
2.3Partreplacement.
2.4Whenthe10Afuseisblownduetotheoperationoftheshortswitch:
2.5Avoidinsertingnails,wireetc.throughanyholesintheunitduringoperation.
2.6Confirmafterrepair
2.7Sharpedges
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2.2Inverterwarnings
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DANGER,HIGHVOLTAGEANDHIGHTEMPERATURE(HOT/LINE)OFTHE
INVERTERPOWERSUPPLY(U)
Thishighvoltageinverterpowersupplyhandlesveryhighvoltageandcurrentforthemagnetrontube.Thoughit
isfreefromdangerinordinaryuse,extremecareshouldbetakenduringrepair.
Thealuminumheatsinkisalsoenergizedwithhighvoltage(HOT),sodonottouchwhentheACinput
terminalsareenergized.ThepowerdevicesCollectorisdirectlyconnectedtothealuminumheatsink.
ThealuminumheatsinkmaybeHOTduetoheatenergy,therefore,extremecareshouldbetakenduring
servicing.
H.V.Inverterwarning
WARNINGFORINVERTERPOWERSUPPLY(U)GROUNDING
Checkthehighvoltageinverterpowersupplycircuitgrounding.Thehighvoltageinverterpowersupplycircuit
boardmusthaveaproperchassisground,theinvertergroundingbracketmustbeconnectedtothechassis.Ifthe
inverterboardisnotgroundeditwillexposetheusertoveryhighvoltagesandcauseextremeDANGER!Be
surethattheinvertercircuitisproperlygroundedviatheinverterearthbracket.
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Groundingoftheinvertercircuitboard
WARNING!DISCHARGETHEHIGHVOLATGECAPACITORS
Forabout30secondsaftertheovenisturnedoff,anelectricchargeremainsinthehighvoltagecapacitorsinthe
inverterpowersupplycircuitboard.
Whenreplacingorcheckingparts,removethepowerplugfromtheoutletandshorttheinverteroutputterminal
ofthemagnetronfilamentterminalstothechassisgroundwithaninsulatedhandlescrewdrivertodischarge.
Pleasebesuretotouchthechassisgroundsidefirstandthenshorttotheoutputterminals.
Dischargingthehighvoltagecapacitors
WARNING
Thereishighvoltagepresentwithhighcurrentcapabilitiesinthecircuitsoftheprimaryandsecondary
windings,chokecoilandheatsinkoftheinverter.Itisextremelydangeroustoworkonornearthesecircuits
withtheovenenergized.DONOTmeasurethevoltageinthehighvoltagecircuitincludingthefilamentvoltage
ofthemagnetron.
WARNING
Nevertouchanycircuitwiringwithyourhandorwithaninsulatedtoolduringoperation.
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2.3Partreplacement.
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Whenanypartorcomponentistobereplaced,alwaysensurethatthepowercordisremovedfromthewall
outlet.
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