Panasonic NN-GS595A Bedienungsanleitung

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ORDERNO.PHAMOS0511035C3

MicrowaveOven

NNGS595A

CHP(HongKong)

CYP(Singapore)

CMP(Malaysia)

CTP(Thailand,Indonesia)

CYT(Others)

CKT(UAE)

CPT(Iran)

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

CZP(CISCountries)

©2005PanasonicHomeAppliancesMicrowaveOven(Shanghai)Co.,Ltd.

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

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10/24/2016 schemat1.png(540×753)

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10/24/2016 schemat2.png(540×753)

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10/24/2016 XMLServiceManual

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2DESCRIPTIONOFOPERATING

SEQUENCE

2.1Variablepowercookingcontrol

HighVoltageInverterPowerSupply(U)controlsoutputpowerbythesignalfromDigitalProgrammerCircuit(DPC).Powerrelay

alwaysstaysON,butPWM(pulsewidthmodulation)signalcontrolsmicrowaveoutputpower.

NOTE:

TheON/OFFtimeratiodoesnotcorrespondwiththepercentageofmicrowavepowersinceapproximately2secondsare

requiredforheatingofmagnetronfilament.

VariablePowerCooking

POWER SETTING OUTPUTPOWER(%) APPROX. MANUALMICROWAVEDUTY

ON(SEC) OFF(SEC)

HIGH 100% 22 0

MEDIUMHIGH 70% 22 0

MEDIUM 55% 22 0

MEDIUMLOW 40% 22 0

LOW 20% 13 9

DEFROST 30% 17 5

2.2InverterpowersupplycircuitNEWH.V.

TheInverterPowerSupplycircuitpoweredfromthelinevoltage,220V50HzACinputsupplies4,000VDCtothemagnetrontube,

andfunctionsinplaceoftheH.V.transformer,theH.V.capacitorandH.V.diode.

1.TheACinputvoltage220240V50HzisrectifiedtoDCvoltageimmediately.

2.DCvoltagewillbesuppliedtotheswitchingdevicescalledIGBT.ThesedevicesareswitchedONOFFbythe20to40

KHzPWM(pulsewidthmodulation)signalfromthemicrocomputerintheDPC.

3.ThisdrivestheHighvoltagetransformertoincreasevoltageupto2,000VAC.

4.Thenthehalfwavedoublervoltagerectifiercircuit,consistingoftheH.V.diodesandcapacitors,generatesthe

necessary4,000VDCneededforthemagnetron.

5.Outputpowerofthemagnetrontubeisalwaysmonitoredbythesignaloutputfromthecurrenttransformerbuiltintothe

invertercircuit.

6.ThissignalisfedbacktothemicrocomputerintheDPCtodetermineoperatingconditionsandoutputnecessaryto

controlPWMsignaltotheInverterPowerSupplyforcontroloftheoutputpower.

2.3Steamdefrost,Autocook&Steamreheat

WhentheAutoControlfeatureisselectedandtheStartpadistapped:

1.Thedigitalprogramercircuitdeterminesthepowerlevelandcookingtimetocompletecookingandindicatesthe

operatingstateinthedisplaywindow.Tableshowsthecorrespondingcookingtimesforrespectiveservingby

categories.

SteamDefrost

SELECTEDWEIGHT COOKINGTIME

1.0kg 15min.20sec.

AutoCook(Rice)

SELECTEDWEIGHT COOKINGTIME

0.2kg 20min.00sec.

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2.Whencookingtimeinthedisplaywindowhaselapsed,theoventurnsoffautomaticallybyacontrolsignalfromthe

digitalprogrammercircuit.

2.4Oven

ThedigitalprogrammercircuitcontrolstheONOFFtimeoftheheaterinordertocontrolovencavitytemperature.

1.Afterselectingdesiredovencavitytemperatureandpressing[Start]pad,ahighlevelsignalcomesoutmicrocomputer

andappliestopowerrelays,RY4andRY5.

2.WhenRY4&RY5switchtoON,powersourcevoltageisappliedtotheupperandlowerheaters,andtheheatersturn

on.

3.Thedigitalprogrammercircuitsensestheovencavitytemperaturethroughoventempsensor(thermistor).Whenthe

oventemperaturereachesthesettemperature,DPCstopssupplyinghighlevelsignaltothepowerrelays,andthe

heatersturnoff.

4.Aftertheupperandlowerheatersturnoff,theoventemperaturewillcontinueincreasingforawhileandthendecrease

asshowninFigure.

Whentheoventemperaturedropsbelowthesettemperature,thedigitalprogrammercircuitsensesthesignaland

startssupplyingahighlevelsignaltopowerrelaysagain.

2.5Combinationcookcontrol

Combinationcookingisaccomplishedbymicrowaveandgrillcooking(upperheater)beingdonesynchronouslyduringone

combinationcookingcycle.Onecombinationcookingcycleis33seconds.

1.Duringcombinationcooking,thedigitalprogrammercircuitcontrolspowerrelayRY4&RY5ʼsONOFFtime.Inallthree

combinationcookingcategories,powerrelayRY1alwaysstayon,butRY5ʼsONOFFtimeasshowninFigure.

COMBINATION CATEGORY GRILL(RY5) MICROWAVE(RY1)

ON(sec.) OFF(sec.)

COMBINATION CATEGORY GRILL(RY5) MICROWAVE(RY1)

ON(sec.) OFF(sec.)

1 33 0 ON

2 24 9 ON

3 18 15 ON

2.6IRreheat

Thetemperatureoffoodbeingheatedisdetectedbyaninfrared(IR)sensorandyoudonothavetosettime.

2.6.1HowtoreadtemperaturebyIRsensor

IRsensorcanreadfoodtemperaturewithouttouching,IRraysareemittedfromfood.IRsensoristogeneratetemperaturerelated

electricsignaloutputandmicrocomputeristoconvertactualtemperature.

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2.6.2Operation

IRsensorismountedontoprightofovencavitythroughthehole.Itscansallovercookingshelf.IRsensorhas8eyesandcanread

ovenshelflefttorightatthetime.ThenIRsensorisdesignedtoscanfronttobacktocoverallovershelf.(19points)



2.7Steamfunction(microsteam&steamreheat)

2.7.1WaterSupply

Waterinwatertankwillbepumpedoutandsupplytothesteamgenerationheaterlocatedinsidebackbottomofovencavity.

2.7.2Operation

Whenpressing[start]pad,ovenpreheatwillstartandthenwatersupplybegins.Itwilltake1minuteforpreheating.Whenpreheatis

completed,itwillturnintoactualcookingprocess.Duringheating,thetemperaturesensor(Thermistor)locatedonsteamheaterwill

monitorsteamheatertemperatureandwhenitexceeds95°C,theadditionalwaterwillbesuppliedtomaintainmoisture/steam

withinovencavity.

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3CAUTIONSTOBEOBSERVEDWHEN

TROUBLESHOOTING

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.

3.1Checkthegrounding

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.

3.2Inverterwarnings

DANGER,HIGHVOLTAGEANDHIGHTEMPERATURE(HOT/LIVE)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notgrounded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grounding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thechassis

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sinkoftheinverter.Itisextremelydangeroustoworkonornearthesecircuitswiththeovenenergized.DONOT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.

3.3Partreplacement

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

3.4Whenthe10Afuseisblownduetotheoperationof

theshortswitch

WARNING

Whenthe10A220Vfuseisblownduetotheoperationoftheinterlockmonitorswitch,replaceallofthecomponents(primary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.

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