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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