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Panasonic microwave buzzing noise

Have a Panasonic NN-S669S. When I turn it on it makes a buzzing noise but does not heat. Is this indicative of a bad diode? If so where is it on this model? Can it be replaced?

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  • Microwave Ovens Master
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Yes, this is usually a shorted high voltage rectifier diode.

It is usually located behind the high voltage transformer and it attaches to the magnetron and to the chassis.

For ciritical safety links how to test the diode, see: http://www.gallawa.com/microtech/diode.html
Panasonic replacement parts can be found here: http://www.pasc.panasonic.com/epartr

Posted on Dec 06, 2007

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