Panasonic NN-A813AB User manual

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ServiceManual
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MOP0307006C2
MicrowaveOven
NNA813AB
NNA873SB
NNA883WB
32Litre
EPGEurope
©1995MatsushitaElectricIndustrialCo.,Ltd.Allrightsreserved.Unauthorizedcopyinganddistributionisa
violationoflaw.

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1InverterWarning
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TheinverterboardlookslikearegularPCB,however,thisPCBdrivesthemagnetrontubeusingveryhigh
voltagesandcurrent.
Ithas
1.Veryhighvoltageandhighcurrent
2.AnAluminiumheatsinkthatbecomesveryhot
3.Thecapacitorsontheinvertercircuitwillcontainahighvoltagechargeevenwhentheovenisnot
operating.
Donot
1.Donottouchthecircuitryasitcontainsveryhighvoltages.Whenreplacingtheboardpleasetakeextreme
caretoavoidpossibleelectricshock.Highvoltagesmayremaininthecircuit.
2.Donottouchthealuminiumheatsinkasitwillbecomeveryhot.Italsocontainshighvoltages.
3.DonotattempttorepairtheinverterPCBasthiscanbeverydangerous.Replacethehighvoltageinverter
circuitasacompleteunit.Returntheoldunitfullyrepackedintheoriginalshippingboxandcompleted
paperwork.
4.Donotadjustortamperwiththepresetvolumeontheinverterboard.Itisverydangeroustoadjustthis
presetwithoutpropertestequipment.
5.Donottesttheovenwhiletheinvertergroundingstriporscrewsareloose.Itisverydangeroustooperate
theinvertercircuitboardwithoutapropergroundconnection.
Figure1

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InverterGounding
Figure2
InverterPCBlayout
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2FeatureChart
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Function A813ABEPG
Microwave 6
Grill 3
Convection 17
Combination YES
Sensorreheat 2
Sensorcook 2
Sensorcombination 4
Weightdefrost 3
Weightcombination 8
Weightreheat 
Weightcook 
Stagecooking 3
Delay/Stand YES
More/Less YES
Kg>lb/oz YES
Clock 12H
Wordprompt English
StepbyStep LED
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3ControlPanel
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4OperationAndDigitalProgrammerCircuitTest
Procdure
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7.1Variablecookingpowercontrol
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TheHIGHVOLTAGEINVERTERPOWERSUPPLYcontrolstheoutputpowerbyasignalfromtheDigital
ProgrammerCircuit(DPC).ThePowerRelay(RY1)turnsontosupplypowertotheinvertercircuit.Thelevel
ofoutputpoweriscontrolledbythedrivesignallevelfromtheinvertercircuitasindicatedinthetablebelow.
NOTE1:TheON/OFFtimeratiodoesnotcorrespondwiththepercentageofmicrowavepowersince
approximately2secondsarerequiredforheatingthemagnetronfilament.
NOTE2:Ifmicrowavecookingisover8minutesonHIGHpower,thefanmotorrotatesfor1minuteafter
cookingtocooltheovenanditselectricalcomponents.
DutyCyclesforMicrowaveCooking
OUTPUT(watts) DUTYON/OFF(seconds)
ONtime OFFtime
HIGH 1000 22 0
DEFROST 270 16 6
MEDIUM 600 22 0
LOW 440 22 0
SIMMER 250 15 7
WARM 100 8 14
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7.2GrillCooking
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TheDigitalProgrammerCircuitcontrolsthegrillpowerbyoperatingthepowerrelayRY4inthesequence
displayedinthetablebelow:
DutyCyclesforGrill
Cooking
DUTYON/OFF(seconds)
ONtime OFFtime
Grill1 66 0
Grill2 54 12
Grill3 42 24
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7.3AutoWeightDefrostandAutoWeightCook
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Whenanautocontrolfeatureisselectedandthestartpadpressed:
1.TheDigitalProgrammerCircuitdeterminesthepowerlevelandthecookingtimeandindicatesthe
operatingstateinthedisplay.Thetablebelowshowsthecorrespondingcookingtimesforeachcategory
anditsrespectiveweight.
2.Whenthecookingtimeinthedisplaywindowhaselapsed,theoventurnsoffautomaticallyviathecontrol
signalfromtheDigitalProgrammerCircuit.
Note:Afterautocooking,iftheoventemperatureisoverthepredeterminedtemperaturethenthefanmotorwill
thenrotatetocooltheovenanditscomponents.
AutoWeightDefrost
CATEGORY 1stTOUCHWEIGHT(grams) COOKINGTIME
Bread&Rolls 100 4m18s
MeatItems 200 3m40s
MeatJoints 400 6m20s
AutoWeightCook
CATEGORY 1stTOUCHWEIGHT(Grams) COOKINGTIME
ChilledPizza 400 08m20s
FrozenPizza 400 08m40s
ChilledQuiche 400 12m40s
FrozenQuiche 400 12m40s
ChickenPieces 500 14m40s
ChickenWhole 1300 23m55s
Pork/Veal 1200 35m00s
Beef 900 26m00s
Lamb 1200 30m05s
Tarte 68(pieces) 29m00s
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7.4ConvectionCooking
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1.TheDigitalProgrammerCircuitoperatesthepowerrelaysRY3,RY5andRY6inthesequenceillustrated
below.
2.Whentheovenreachesapredeterminedtemperaturethedigitalprogrammercircuitstopssupplyingpower
totherelayRY5,resultingintheconvectionheaterturningoff.
3.Whenthetemperaturedropsbelowthepredeterminedtemperature,thedigitalprogrammercircuitsupplies
powertotherelayRY5resultingintheconvectionheaterturningon.
Note:Aftertheconvectionprocess,iftheoventemperatureishigherthanthepredeterminedtemperature,
thefanmotorrotatestocooltheelectroniccomponentsandthoven.
ConvectionCookingDutyCycles
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7.5CombinationCooking
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CombinationCookingisachievedbyoperatingtheMicrowaveandHeatermodestogetherduringonecookingcycle.
Therearethreepossiblecombinationmodes:
1.ConvectionandMicrowave
2.GrillandMicrowave
3.Convection,GrillandMicrowave
TheDigitalProgrammerCircuitoperatesthepowerrelaysasshowninthefiguresbelow.
Whentheoventemperaturereachesthepredeterminedtemperature,theDigtalProgammerCircuitstopssupplying
powertotherelayRY5resultingintheconvectionheaterturningoff.Duringthistime,theDigitalProgrammerCircuit
continuestooperaterelay(RY1)sothatmicrowaveactivitycontinuesatthedutycycleselected.TheInvertercontrol
signallevelisalsomaintained.Themicrowaveactivitycontinuestocycleuntiltheentirecookingprogramiscompleted.
Whentheoventemperaturedropsbelowtheselectedtemperature,theDigitalProgrammerCircuitoperatespowerrelay
RY5,switchingontheheaterelements.
Inthecaseofgrillcombination,thesequenceapplieswiththeDigitalProgrammerCircuitswitchingpowerrelayRY4to
controlthegrillelements.
Withconvection,grillandmicropowercombination,thegrillandcovectionelementsareoperatedalternativelywhilst
theoventemperatureisabovetheselectedlevel.
CovectionandMicrowaveCombinationDuty
Cycles
CONVECTIONHEATER MICROPOWER
100~250C Output(W) On(seconds) Off(seconds)
Medium 600 66 0
Low 440 66 0
Simmer 440 45 21
Warm 440 24 42
GrillandMicrowaveCombinationDuty
Cycles
GRILLHEATER MICROPOWER
On Off Output(W) On(seconds) Off(seconds)
Grill1 66 0 Medium 600 66 0
Grill2 48 18 Low 440 66 0
Grill3 36 30 Simmer 440 45 21
Warm 440 24 42
Grill,ConvectionandMicrowaveCombinationDutyCycles
CONVECTIONHEATER GRILLHEATER MICROPOWER
100250C On Off Output(W) On(seconds) Off(seconds)
Grill1 66 0 Medium 600 66 0
Grill2 48 18 Low 440 66 0

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Grill3 36 30 Simmer 440 45 21
Warm 440 24 42
ConvectionandMicrowaveDutyCycles

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GrillandMicrowaveDutyCycles

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Grill,ConvectionandMicrowaveDutyCycles
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7.6OneTouchAutoSensorCooking
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AutoSensorCookisarevolutionarywaytocookbyMicrowavewithoutsettingapowerlevelorselectinga
time.Itisonlynecessaryistoselectanautosensorprogrambeforestartingtocook.
UnderstandingAutoSensorCooking
Asfoodcooks,acertainamountofsteamisproduced.ifthefoodiscovered,thissteambuildsupandeventually
escapesfromthecontainer.InAutoSensorcooking,acarefullydesignedinstrumentcalledtheHumiditySensor
Elementsensestheescapeescapeofsteam.BasedupontheAutoSensorProgramselected,theunitwill
automaticallydeterminethecorrectpowerlevelandcalculatethelenghoftimeitwilltaketocookthefood.
NOTE:AutoSensorCookingisissuccessfulwiththefoodsandrecipesfoundintheAutoSensorCooking
guide.Becauseofthevastdifferencesinfoodcomposition,itemsnotmentionedinthecookingguideshouldbe
preparedusingthepowerselectandtimefeatures.Pleaseconsultvariablepowermicrowavecookbookfor
proceedures.
ExplanationoftheAutoSensorCookingprocess:
1.TheshadedcolumnsinFigure1indicatewhenthehumiditysensorheaterison.
2.Duringthe30secondsperiodthereisnomicrowaveactivity.WhencalculatingtheT2timebyusingthe
formulabelow,makesurethe30secondsissubtractedfromtheT0time.
3.T1timeT0time30seconds.
4.T2timewhenthesteamescapesfromthecookingcontainerplacedintheoven,
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