Panasonic NN-S554MF User manual

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ServiceManual

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ORDERNO.SIMMC0408030A3

MicrowaveOven

NNS554MFNNS554WFNNK593MF

NNK574MFNNK574WF

NNK544WF

HPE(HongKong)

YPQ(Singapore)

MPQ(Malaysia)

TPE(Thailand,Indonesia)

LPK(Philippines)

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S553/K593/K573/K543

(ORDERNO.SIMMC0306022C3).

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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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2.1Checkthegrounding

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Donotoperateonatwowireextensioncord.Themicrowaveovenisdesignedtobegroundedwhenused.Itis

imperative,therefore,toensuretheapplianceisproperlygroundedbeforebeginningrepairwork.

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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)

The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),donottouchwhentheACinputterminals

areenergized.Thepowerdevice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.

Groundingoftheinvertercircuitboard

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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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2.4Whenthe10Afuseisblownduetotheoperation

oftheshortswitch:

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WARNING

Whenthe10A250Vfuseisblownduetotheoperationoftheinterlockmonitorswitch,replaceallofthe

components(primarylatchswitch,secondarylatchswitch,shortswitchandpowerrelayB(RY1)).

1.Thisismandatory.Referto“adjustmentsandmeasurements”forthelocationoftheseswitches.

2.Whenreplacingthefuse,confirmthatithastheappropriateratingforthesemodels.

3.Whenreplacingfaultyswitches,besurethemountingtabsarenotbent,brokenordeficientintheirability

toholdtheswitches.

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