Question about Sharp R-230 Microwave Oven

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Blows fuse It worked fine for 15 years...now during boiling a cup of water the 20A fuse smoked. I replaced it, it powered up but when I tried to boil water the fuse blew again. I guess it's really sick... Thanks, Matt

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  • matt781 Mar 02, 2009

    Thank you Guys!

    I think this (HV capacitor) could be the problem, but I thought was asking about different model: R-9H94B, 900W oven with 1450W Convection Heater, this is what I have. I'll follow up with the test and try to repair it myself. (I am an electronic technician but I was working as a computer tech.) Will be in touch.

    Thanks,

    Matt

  • matt781 Mar 19, 2009

    The problem was what you described! I replaced a shorted .96 mF capacitor and the associated diode that was open; it cost me $47.00.

    Thank you Guys again, you're great! Now I have two microwaves, because in the mean time I bought a nice little GE with a browner. (My wife couldn't wait until I fix the Big Sharp...)

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  • 8,820 Answers

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

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

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

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

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

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


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

The best place to order parts for this brand is Encompass (formerly Tritronics). Or you can call them toll-free at 866-779-5835.

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

Posted on Mar 02, 2009

  • William Miller
    William Miller Mar 07, 2009

    If it turns out we were right about the capacitor, we'd appreciate if you consider giving us a FixYa rating. Thanks!

  • William Miller
    William Miller Mar 19, 2009

    We'd appreciate if you'd consider giving us a FixYa rating. Thanks!

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Conduct what the USDA Food Safety and Inspection Service calls a "Time-to-Boil" test, which will help you estimate your microwave's wattage. Add 1 cup of water to a microwave-safe 2-cup measure. Add ice cubes and stir until the water is icy cold. Pour out the excess water, leaving just 1 cup. Place the measuring cup inside the microwave. Set the oven for four minutes on high. Watch through the glass to see when the water boils. If it takes less than two minutes, the microwave is 1,000 watts or more; if it takes 2.5 minutes, the oven has a rating of 800 watts or more; if it boils in 3 minutes, the estimated wattage is 650 to 700.


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Owners of a GE WES model might want to look at this blog post.

I'm sure the magnetron overheated and tripped the magnetron's thermal cutout.

I'd strongly suggest taking it back if you can.

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

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Even better, if this happens a lot with a certain container, put a wooden (non-metallic) spoon in the container before you heat it.

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