Maytag ACM0720AB - Page 21

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Troubleshooting Procedures
Trouble 5: No microwave oscillation even when oven light and fan motor operate.
No microwave
oscillation.
Disconnect wire
leads from relay
RY2 and verify
continuity of the
relay.
No
Continuity
Failed
printed circuit
board.
Replace
printed circuit
board.
Continuity
Check
high voltage
transformer.
Abnormal
Normal
Failed
high voltage
transformer.
Replace
high voltage
transformer.
Check
high voltage
capacitor.
Abnormal
Normal
Failed
high voltage
capacitor.
Replace
high voltage
capacitor.
Check
high voltage
diode.
Abnormal
Normal
Failed
high voltage
diode.
Replace
high voltage
diode.
Abnormal
Failed
printed circuit
board.
Replace
printed circuit
board.
Check
magnetron.
Abnormal
Failed
magnetron.
Replace
magnetron.
Disconnect wire
leads from relay
RY2 and verify
continuity of the
relay.
Operates at
full power
when
programmed
for lower power.