Question about Sharp Microwave Ovens

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Turn on microwave and it blows the fuse. Replace fuse and as quick as you turn on the microwave it blows the fuse again. Thanks Frankie

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  • hommerstang Jun 28, 2009

    Its blowing the fuse as quick as you start the microwave up. You replace the fuse and you can plug in microwave back in set the time and its fine but as soon as you start the microwave up it blows the fuse again. The microwave is a Sharp R-530BK.

  • William Miller
    William Miller May 11, 2010

    Is it blowing when you plug it into the wall, when you open or close the door, or when it you hit Start to begin cooking? If the latter, is it blowing immediately after you hit Start, or about 2-3 seconds later? Also, please reply back with your brand and model number so we can help you.

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  • Sharp Master
  • 9,047 Answers

This is almost certainly a shorted high voltage capacitor, part # RC-QZB018MRE0 (zeroes, not "ohs").

We have the service / repair manual for this model and have uploaded it to our site here to help you.

It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.

Most computers will open this document automatically, but you may need the free Adobe Reader.

You can order parts from Encompass here 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 Jun 30, 2009

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Micowave blows the fuse when turned on


The transformer that makes hi voltage for the Magnetron tube is causing the fuse to blow. This may be a bad Magnetron tube or a shorted winding in the transformer. Price for the repair may be too close to the price for a new oven, so check with a repair center before deciding to replace it.

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I am wondering which fuse is blowing?
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It isn't wise for an unqualified person to replace the internal fuses of a microwave even if it is switched off as there is a capacitor inside that is capable of storing a dangerous amount of energy.

The reasons why a fuse blows is either because there is a poor connection close by that is generating a lot of heat or the the fuse rating is incorrect or of the wrong type (quick-blow instead of slow-blow) or the appliance is consuming more current than it should be.

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Whirlpool Microwave (model WMH1164XVS-1 ) does not turn on


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GE SpacemakerXL Microwave Model JVM1450 It's been working great. Then put somethingin,turn it on. It ran 30sec. made a growling sound,like it was straning or slowing down,then Blew the fuse.I replace the...


SOUNDS LIKE MAYBE HIGH VOLTAGE RECTAFIER SHORTED MIC ARE VERY DANGEROUS THEY HOLD VOLTAGE EVEN WHEN UNPLUGED YOU MAY CONSIDER PRO ON THIS SORRY

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All of a sudden, no power, no lights, NOTHING!


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My microwave will not turn on at all. We had several electronic items go out during a storm. I was wondering if there might be a way to fix it.


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Fuse keeps blowing.


couple questions -
what else is on the circuit,
and what current does the oven need

there are whirlpool over-range models with
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1500watts of convection power, a
60watt bulb and a
375watt fan

over 15amps -20amp circuit needed

if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide http://www.whirlpool.com/assets/pdfs/product/ZINSTALL/8206589.pdf reccommends 20amp
not a solution, something to check,

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1 Answer

Blown fuse


Be doubly sure your microwave is unplugged first, of course! Be sure the fuse is not loose in the holder. If you can rotate it in the holder easily with just a thumb and finger, then it's too loose and the holder should also be replaced. That looseness causes a heat buildup, which makes the fuse melt open inside over time. If the new fuse blows as soon as you hit START then you likely have a shorted high-voltage capacitor. If it blows again a few seconds or minutes after you hit START, then you likely have a bad high-voltage transformer or magnetron. It's not inherently unsafe to replace a fuse, as long as you heed the safety rules. The microwave does contain and prodcue voltages that can be instantly lethal. Feel free to see my safety info via my listing here on FixYa: http://tinyurl.com/yzjozk

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