Question about Microwave Ovens
Hopefully you either have a meter or know someone with a meter. UN-PLUG the unit then remove the outer chassis by removing the 4 side screws and 6 rear screws in the chassis cover. Lift from the rear of the unit about 10 degrees and slide off the cover. Use a screw driver holding only the handle and SHORT the high voltage capacitor several times to make sure it is discharged.
Set a multi meter on resistance scale R x 10,000. Probe the HV Capacitor with the meter leads.
You should see a jump then the reading return to infinity. Reverse the test leads and check it again with the same result. No jump = bad cap.
Locate the Power diode terminal (metal wire usually) connected to the HV capacitor and disconnect it from the capacitor. Read the diode just like you did with the HV capacitor reversing the leads. The correct reading will be continuity in one direction and close to infinity in the other direction. If you get any other reading (open / infinity or shorted / ZERO in both directios) the diode is bad. Diodes are cheap...(and not unit specific in most cases) They usually are the failure cause in a microwave that has limited use.
If your Cap and Diode readings are good then it is possible for the magnetron to have failed but it is a rare failure. Failed magnetrons usually make a sudden loud humming sound.... BUT.... a bad diode will cause the same symptom... loud hum / no heat.
I sure would like to know what you find out.
Thanks for choosing FixYa.
Posted on Nov 08, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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