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29
6. AlignmentandAdjustments - MGA20M - MGB22M - MGB22Y
6-1HighVoltageTransformer
1.Removeconnectorsfromthetransformerterminals
andcheckcontinuity.
2.Normalresistancereadingsareasfollows:
(Roomtemperature=20°C)
6-2LowVoltageTransformer
1.Thelowvoltagetransformerislocatedonthe
controlcircuitboard.
2.Removethelowvoltagetransformer (if present), fromthe
PCBAss'yandcheckcontinuity.
3.Normalresistorreadingisshowninthetable.
6-3Magnetron
1.Continuitycheckscanindicateonlyanopen
filamentorashortedmagnetron.Todiagnosean
openfilamentorshortedmagnetron:
2.Isolatethemagnetronfromthecircuitby
disconnectingitsleads.
3.Acontinuitycheckacrossthemagnetronfilament
terminalsshouldindicateoneohmorless.
4.Acontinuitycheckbetweeneachfilamentterminal
andmagnetroncaseshouldreadopen.
Primary
Terminals
FilamentTerminals
Secondary
Terminal
MagnetronAntenna
GasketPlate
CoolingFins
PRECAUTION
1.Highvoltageispresentatthehighvoltageterminalsduringanycookcycle.
2.Itisneithernecessarynoradvisabletoattemptmeasurementofthehighvoltage.
3.Beforetouchinganyovencomponentsorwiring,alwaysunplugtheovenfromitspowersourceand
dischargethehighvoltagecapacitor.
Secondary
Filament
Primary
Approx.115
Approx.0
Approx.1.35
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