Question about Sharp R-1490 Microwave Oven
You have a failed high voltage transformer, magnetron, or high rectifier diode, or possibly both of the last two.
A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.
The service manuals you need are here:
Here are some links you or someone you know can use for test help, but read their safety warnings first:
You can order parts from Encompass here or you can call them toll-free at 866-779-5835.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Oct 02, 2010
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Posted on Jan 02, 2017
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