Panasonic NN­GS595A - 5 COMPONENT TEST PROCEDURE; 5.1 Primary Latch Switch & Power Relay B Interlocks; 5.2 Short Switch & Monitor Testing; 5.3 Magnetron Testing

10/24/2016 XMLServiceManual
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5COMPONENTTESTPROCEDURE
CAUTIONNEW.H.V.
1.HighvoltageispresentatthehighvoltageterminaloftheHighVoltageInverter(U)includingaluminumheatsinkduringany
cookcycle.
2.Itisneithernecessarynoradvisabletoattemptmeasurementofthehighvoltage.
3.Beforetouchinganyovencomponents,orwiring,alwaysunplugtheovenfromitspowersourceanddischargethehighvoltage
capacitors.
5.1Primarylatchswitch(doorswitchandpowerrelay
B)interlocks
1.UnplugleadconnectorstoPowerRelayBandverifyopencircuitofthepowerrelayB12terminals.
2.UnplugleadconnectorstoPrimaryLatchSwitchandDoorSwitch.
3.Testthecontinuityofswitchesatdooropenedandclosedpositionswithohmmeter(lowscale).
Normalcontinuityreadingsshouldbeasfollows.
DoorClosed DoorOpened
PrimaryLatchswitch
0Ω(Close)
Ω(Open)
DoorSwitch
0Ω(Close)
Ω(Open)
PowerRelayB Ω(Close) Ω(Open)
5.2Shortswitch&monitor
1.UnplugleadwiresfromInverterPowerSupply(U)primaryterminals.
2.ConnecttestprobesofohmmetertothedisconnectedleadsthatwereconnectedtoInverterPowerSupply(U).
3.Testthecontinuityofshortswitchwithdooropenedandclosedpositionsusinglowestscaleoftheohmmeter.
Normalcontinuityreadingsshouldbeasfollows.
DoorOpened DoorClosed
0Ω
Ω
5.3Magnetron
Continuitycheckscanonlyindicateanopenfilamentorashortedmagnetron.Todiagnoseforanopenfilamentorshorted
magnetron.
1.Isolatemagnetronfromthecircuitbydisconnectingtheleads.
2.Acontinuitycheckacrossmagnetronfilamentterminalsshouldindicateoneohmorless.
3.Acontinuitycheckbetweeneachfilamentterminalandmagnetroncaseshouldreadopen.