Question about Microwave Ovens

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Sharp R-510AK Microwave Oven Fuse Blows

Have a Sharp R-510AK Microwave Oven. When the Start button is pressed the main fuse blows. Thanks is advance for any and all help.

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  • bhamel Dec 13, 2008

    mine blows the main fuse almost immediately after the cooking function engages. I checked the HV capacitor and it reads .9 ohms in both directions. I also ohmed out the diode that goes from the HV capacitor to the case. It reads an open circuit in both directions and it appears to have gotten warm on one side. I believe the HV capacitor is bad along with the diode. My concern is that the magnetron is also bad - if so - not worth repairing. Can a simple ohm check tell me if the magnetron could be the main cause of the bad cap and diode?

  • Anonymous Mar 28, 2014

    When I press the start button on the microwave the oven temp indicator comes on. The microwave does not start.

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  • Microwave Ovens Master
  • 9,098 Answers

If it went dead almost immediately after pressing the Start pad, that\'s usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that\'s usually a failing high-voltage transformer.

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

http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html


You can probably find an exploded view by entering your FULL model number here: http://www3.sears.com (the 3 is correct)
You can order Sharp parts from Sears or from Tritronics at http://www.wehaveparts.com
We\'re happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jan 13, 2008

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