Question about Sharp Microwave Ovens

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Sharp R872m microwave not warming up anything?

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  • raks777 Jul 21, 2008

    Yes the inside light and turntable come on when trying to cook and there is no unusual noise.

  • William Miller
    William Miller May 11, 2010

    Do the inside light and turntable come on when you try to cook?

    Is it making any unusual noise or is it louder or quieter than normal?


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  • Sharp Master
  • 8,820 Answers

Then the most likely suspects are:

- loose / corroded connection at the magnetron terminal
- bad magnetron (may buzz or hum, may not)
- bad high voltage transformer (may smell / smoke, may not)
- shorted high voltage rectifier diode (may hum, may not)

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.

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
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html
If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If you want to find a local Sharp-authorized servicer, visit http://www.sharp.co.uk

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

Posted on Jul 21, 2008

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