Question about Microwave Ovens

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Ge spacer xl1800

Makes a large noise when the microwave is running, if i have it on defrost the noise stops...is there anything to worry about

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  • surfinsanj Nov 21, 2008

    i took the front cover off and when i turned it on i saw a blue light in the back and some sparking....i assume the microwave was on it last leg

  • William Miller
    William Miller May 11, 2010

    Can you describe the noise or post a video with sound?

    I would suspect the magnetron is failing, especially since you say it doesn't happen on defrost.

    At high (default) cooking power, the magnetron is on steadily. On defrost, the magnetron is not turned on as long.




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  • Microwave Ovens Master
  • 9,011 Answers

It may be an arcing high voltage transformer or high voltage rectifier diode or possibly a bad magnetron.

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

http://www.microtechfactoryservice.com/diode.htmlhttp://www.microtechfactoryservice.com/xformer.html


http://www.microtechfactoryservice.com/mag_test.html
(continuity can be good even though it is bad!)

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

Posted on Nov 21, 2008

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The magnetron uses very high voltage at very high current. There is a very large capacitor in the power supply for filtering the DC for the magnetron. This area of the microwave oven is very dangerous to work on. The power supply can be lethal if proper procedure is not complied to when working on it.

I strongly suggest that you do NOT attempt to service this yourself, unless you have the proper training, test instruments, tools, and service manuals to work on it.

After servicing, the tech is supposed to verify the operating power level, and do an EM (ElectroMagnetic) radiation leakage test. This is important after servicing this type of appliance.

Take the microwave oven in for an estimate. From this you can make an intelligent decision if you are going to have it serviced or replace it.

Excellent article about microwave ovens:
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Microwave_ovens_safety_issues?Open

Microwave Oven FAQ from GE:
http://www.geappliances.ca/faq/faq5.jsp



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