©2010 ACP Inc.
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Trouble 1: Oven does not operate at all, no inputs can be accepted.
Troubleshooting Procedures (Dial Models)
When you get a complaint from customers, evaluate the complaint carefully. If the following symptoms apply, instruct
the customer in the proper use of the microwave oven. This can eliminate an unnecessary service call.
CAUTION
!
• Verify proper grouding before checking for trouble.
• Be careful of the high voltage circuit.
• Discharge the high voltage capacitor.
• When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from
these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or
damage to your meter.
• Do not touch any part of the circuit on the controller, since static electric discharge may damage the control
panel. Always touch yourself to earth while working on this panel to discharge any static charge built up in your
body.
Does the
fuse blow?
NO
NO
NO
Does the fan motor work when you
shut the door and turn the timer?
YES
If outlet has proper voltage, check
continuity of power supply cord.
Replace power supply cord.
NO Continuity
Check continuity of interlock
monitor switch with door shut.
Replace interlock
switch assembly
Continuity
YES(Refer to next page)
Both continuity
Replace fuse and check
continuity of both interlock
switch’s contact and monitor
switch’s contact with door
partially open until monitor
switch contact.
Replace primary, secondary interlock
switch and interlock monitor switch.
NO
Fuse again
Disconnect one side of the
lead wire connected from
transformer to the high
voltage capacitor, and operate
oven.
Replace high voltage capacitor.
Replace high voltage transformer
Normal
