(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly)

CONDITION

No microwave oscillation.

CHECK

RESULT

Disconnect the

No continuity.

wire leads from

 

relay 2 and

 

check continuity

Continuity.

of relay 2.

 

(Operate the unit)

 

Check high vol-

Abnormal

tage transformer

 

Normal

CAUSE

Defective PCB assembly.

Defective high voltage transformer.

REMEDY

Replace PCB assembly.

Replace high voltage transformer.

Check high vol-

Abnormal

tage capacitor.

 

Normal

Check high vol-

Abnormal

tage diode.

 

Defective high voltage capacitor.

Defective high voltage diode.

Replace high voltage capacitor.

Replace high voltage diode.

Normal

Check magnetron.

Abnormal

Defective magnetron.

Replace magnetron.

NOTE : • Make sure the wire leads are in the correct position.

When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.

When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition.

Output is full power when you set lower power level.

Disconnect the wire leads from

relay 2 and check continuity relay 2. (Operate the unit)

Abnormal.

Defective PCB assembly.

Replace PCB assembly.

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Whirlpool 721.663398 manual Check Result

721.663398 specifications

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