Kenmore 721.62469200 model microwave, makes buzzing sound when running, turned off asap. Removed cover, tested unit, saw a flash in the area of the magnatron, when it buzzed, only let buzz 1-3 seconds. Capacitor did not check shorted, but, my meter only goes to a 1000 ohms. Magnatron also did not check shorted to ground, shorted pin to pin. Diode checked open both ways need to get another meter for better test. Could diode or capacitor cause the buzzing sound or do I need to get a magnatron. Thanks Frank
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Aug 12, 2011 - 10 posts - 2 authors
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The buzzing sound could be from loose laminations on the high voltage transformer, or from loose mounting screws for the transformer. This requires investigation by a qualified technician as there are lethal voltages associated with the transformer. It could also be from a loose cover. First check that all the cover screws are tight.
The problem is most likely caused by a defective magnetron that "heats the food" is loading down the high voltage transformer causing it to make a loud buzzing sound. The cost to repair (depending on make and model) will probably approach the cost of a new microwave oven when you factor parts and labor.
Hello there: There's no heat, but it buzzes loudlyWhen
the microwave won't heat, but you hear a loud buzz, you usually have a
defective power diode, high-voltage capacitor, or magnetron. I
recommend that you consult with a qualified appliance repair technician
for help in determining the problem and deciding what to do about it. And if you have your warranty for this you can use it to ok Hope this helps best regards mike
It's likely a bad magnetron or maybe the high-voltage transformer.
If it's within the warranty period of the magnetron (5 years or less), I would call Sears.
In my professional opinion, no one should work on a microwave unless they are fully informed and aware of the deadly hazards and necessary precautions.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
You can find helpful exploded view diagrams and order parts by entering your full model number (without the suffix) here: http://tinyurl.com/gv383
Have you tried putting a cup of water in it and cooking on a low power level?
If it buzzes only when it is on the cook cycle, that would narrow it down.
More detals might help us help you, including the model number.