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My Sharp microwave appears not to be working correctly. When I select the time to cook and press start the light comes on and the timer counts down, but it doesn't cook anything. It worked fine yesterday and now it won't work properly. Is there anything that I can do to troubleshoot what is wrong?

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Mar 21, 2011

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