Panasonic NN-V653WF User manual

ORDERNO.SIMMC0303012C2
MicrowaveOven
NN-V653WF NN-V653CF / NN-V623MF NN-F663WF / NN-
F653WF NN-F623MF / NN-V453WF NN-V423MF / NN-T553WF
NN-T523MF / NN-T543WF NN-Q553WF / NN-Q523MF NN-
Q543WF
BPQ(U.K.)
GPG(Germany)
EPG(France, Italy, Finland, Spain, Portugal, Greece, Poland, Holland)
SPECIFICATIONS
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1. SCHEMATICDIAGRAM(FORGRILL MODELS)
2. SCHEMATICDIAGRAM(FORSOLO MODELS)
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3. DESCRIPTIONOFOPERATING SEQUENCE
3.1. Variablepowercooking control
High VoltageInverterPowersupply(U) controlsoutputpowerbythesignal from Digital
ProgrammerCircuit(DPC). Powerrelay stays ONfor P4toP10 and For P1toP3, bothinverter
drive signal and powerrelay tocontrol outputpower.
NOTE:
TheON/OFF timeratiodoes notcorrespond withthepercentageof
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microwavepowersince approximately2secondsarerequiredfor
heating ofmagnetron filament.
VariablePowerCooking
POWERSETTING OUTPUT
POWER(%)
APPROX.
ON-OFF TIME OF
POWERRELAY
(RY1)
ON(SEC) OFF(SEC)
HIGH P10 100% 22 0
P9 90% 22 0
P8 80% 22 0
MEDIUM-HIGH P7 70% 22 0
MEDIUM P6 60% 22 0
P5 50% 22 0
P4 40% 22 0
MEDIUM-LOW P3 30% 22 0
P2 20% 15 7
P1 10% 8 14
DEFROST P3 30% 22 0
3.2. Inverterpowersupplycircuit[NEW H.V.]
ThisInverterPowerSupplyCircuitsupplies 4,000V DC tothemagnetron tubefrom theline
voltage, 230-240V 50HzACinput. functionsas theH.V. transformer, theH.V.capacitor and
H.V.Diode.
1. TheACinputvoltage230-240V50HzisrectifiedtoDC voltage
immediately.
2. DC voltagewill besuppliedtotheswitching devices calledIGBT.
These devices will beswitchedON-OFF bythe20 to40 kHzPWM.
(pulse widthmodulation)signal fromthemicrocomputerinthe
DPC.
3. Thisdrives theHigh voltagetransformertoincrease up to2,000V
ACand approximately3VACbymeansoftransformer.
4. Thenthehalf-wavedoublervoltagerectifiercircuit, consisting of
theH.V. diodes and Capacitors, generates thenecessary4,000V
DC neededforthemagnetron.
5. Outputpowerofthemagnetron tubeisalwaysmonitoredbythe
signal outputfromthecurrenttransformerbuiltintotheinverter
circuit.
6. Thenthissignal will befedback tothemicrocomputerintheDPC
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todetermineoperating conditionsand outputnecessarytocontrol
PWMsignal totheinverterPowerSupplytocontrol outputpower.
3.3. Inverterturbo defrost
WhenthisAutoControl featureisselectedand theStartPadistapped:
1. Thedigital programercircuitdetermines thepowerlevel and
cooking timetocomplete cooking and indicates theoperating
state inthedisplaywindow. Tableshowsthecorresponding
cooking times forrespectiveserving bycategories.
2. Whencooking timethedisplaywindow has elapsed, theoven
turnsoff automaticallybyacontrol signal fromthedigital
programmercircuit.
4. CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
Unlike manyotherappliances, themicrowave ovenisahigh voltage, high currentdevice. Itis
free from dangerinordinaryuse, though extremecareshouldbetakenduring repair.
Caution
Servicemenshouldremovetheirwatches wheneverworking close
toorreplacing themagnetron.
4.1. Check thegrounding
Donotoperateon atwowireextension cord. Themicrowave ovenisdesignedtobegrounded
whenused. Itisimperative, therefore, toensuretheappliance isproperlygroundedbefore
beginning repairwork.
4.2. Inverterwarnings
DANGER, HIGHVOLTAGE AND HIGHTEMPERATURE (HOT/LINE)OFTHE INVERTERPOWER
SUPPLY(U)
Thishigh voltageinverterpowersupplyhandles veryhigh voltage
and currentforthemagnetron tube. Though itisfree fromdangerin
ordinaryuse, extremecareshouldbetakenduring repair.
Thealuminumheat sinkisalsoenergizedwithhigh voltage(HOT),
sodo nottouchwhentheACinputterminalsareenergized. The
powerdevices Collectorisdirectlyconnectedtothealuminumheat
sink.
Thealuminumheat sinkmaybeHOTduetoheat energy, therefore,
extremecareshouldbetakenduring servicing.
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H.V. Inverterwarning
WARNINGFORINVERTERPOWERSUPPLY(U) GROUNDING
Check thehigh voltageinverterpowersupplycircuitgrounding. The
high voltageinverterpowersupplycircuitboardmust haveaproper
chassisground, theinvertergrounding bracket must beconnected
tothechassis. Iftheinverterboardisnotgroundeditwill expose
theusertoveryhigh voltages and cause extremeDANGER!Besure
that theinvertercircuitisproperlygroundedviatheinverterearth
bracket.
Grounding oftheinvertercircuitboard
WARNING!DISCHARGE THE HIGHVOLATGE CAPACITORS
Forabout30 secondsaftertheovenisturnedoff, anelectriccharge
remainsinthehigh voltagecapacitorsintheinverterpowersupply
circuitboard.
Whenreplacing orchecking parts, removethepowerplug fromthe
outlet and shorttheinverteroutputterminal ofthemagnetron
filamentterminalstothechassisground withaninsulatedhandle
screwdrivertodischarge. Please besuretotouchthechassis
ground sidefirst and thenshorttotheoutputterminals.
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