Question about Sharp R-1870 Convection/Microwave Oven

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Turn table works - loud buzzing noise

Not sure if it heats afraid to let it keep running

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

MicrowaveSvc
  • 9047 Answers

SOURCE: R-9H66C does not heat.

Yes, it is either a bad door switch or a loose or misaligned door switch holder.

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jun 23, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Loud buzzing noise when operating

This is most likely a shorted high voltage rectifier diode, but the magnetron may be bad as well.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)


http://www.gallawa.com/microtech/mag_test.html

Info on ordering Sharp UK parts / spares is here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Jul 13, 2009

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GE JES738WJ02 not heating it runs but with loud buzzing noise, turntable turns, light is on -no heat


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Power on Turn,Turn Table Moves,but don't heat


To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms ("no heat"), as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

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We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

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.

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The loud buzzing you hear is the sound of the magnatron tube.That is what emits the microwave radiation and buzzing should be normal. The mag tube may be nearing its end at witch time you will hear no buzzing and hence no heating of foods. Replacement can be costly depending on the model so most people just opt for a new one. Hope this helps

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I purchased a GE microwave oven in March 2008. It was working just fine, then I went to use it again, and it will not heat anything. The light comes on, the turn table turns, but does not heat naything. ...


I'd say you have a bad magnetron, but it will have a full one year warranty on parts and labor.

Let GE fix it for you free. GE Customer Service is online here.

We're happy to help and we appreciate your thoughtful rating of our answer.

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The noise is coming from the high-voltage transformer being overloaded by something shorting it out. Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. Its only affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

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This is not safe. If the fan is not running, the magnetron will quickly overheat and be destroyed. We answered this in more depth in the other place you asked it.

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