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30
7. AlignmentandAdjustments - MGB28M - MCB28E
7-1HighVoltageTransformer
1.Removeconnectorsfromthetransformerterminals
andcheckcontinuity.
2.Normalresistancereadingsareasfollows:
(Roomtemperature=20°C)
7-2LowVoltageTransformer
1.Thelowvoltagetransformerislocatedonthe
controlcircuitboard.
2.Removethelowvoltagetransformer (if present), fromthe
PCBAss'yandcheckcontinuity.
3.Normalresistorreadingisshowninthetable.
7-3Magnetron
1.Continuitycheckscanindicateonlyanopen
filamentorashortedmagnetron.Todiagnosean
openfilamentorshortedmagnetron:
2.Isolatethemagnetronfromthecircuitby
disconnectingitsleads.
3.Acontinuitycheckacrossthemagnetronfilament
terminalsshouldindicateoneohmorless.
4.Acontinuitycheckbetweeneachfilamentterminal
andmagnetroncaseshouldreadopen.
Secondary
Filament
Primary
Approx.110
Ω
Approx.0
Ω
Approx.1.450
Ω
Terminals Resistance
1~2(Input)
3~4(Output2.9V)
5~6(Output13V)
1,000
Ω
3.947
Ω
2.117
Ω
Primary
Terminals
FilamentTerminals
Secondary
Terminal
MagnetronAntenna
GasketPlate
CoolingFins
PRECAUTION
1.Highvoltageispresentatthehighvoltageterminalsduringanycookcycle.
2.Itisneithernecessarynoradvisabletoattemptmeasurementofthehighvoltage.
3.Beforetouchinganyovencomponentsorwiring,alwaysunplugtheovenfromitspowersourceand
dischargethehighvoltagecapacitor.
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