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I have a Sharp Carousel R-590 microwave that is about 10 years old. I fixed popcorn last night and after it stopped I added 30 seconds. It appeared to run but with a different and louder noise. However, it didn't cook anymore. I tried to heat a cup of water and no heat. I unplugged it and restarted it and again it runs with a lound noise but not heat. Is this repairable? Considering the age, is it worth it? If it isn't worth it, what brand and model would you suggest? I usuallty use my microwave for reheating and popcorn and do little cooking with it. Thank you.

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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.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, 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 Dec 31, 2010

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