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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  • 9,098 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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Why does my Sharp Carousel convection microwave keep blowing fuses ?

I am wondering which fuse is blowing?
There are at least two fuses fitted internally and in the UK at least another fitted in the plug of the supply lead.

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.

Microwave ovens have a fairly simple working principle and there aren't many things to go wrong. When things do start to go wrong or components become tired it is usually translated into a loss of efficiency that can be measured by how long it takes to boil a measured quantity of water, for instance.
Periodically timing a measured quantity of water to boiling point is a good way to monitor the performance of a microwave and when efficiency falls significantly take it to the service shop before something destroys itself and causes more damage.

In my limited experience the magnetron could be failing but the internals of a microwave should remain a mystery to the unqualified.
I hope this helps a little.

Jan 15, 2015 | Sharp Microwave Ovens

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

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May 06, 2013 | Microwave Ovens

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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...


Nov 06, 2009 | GE Microwave Ovens

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

if the microwave is on the same circuit as the refrigerator, it's possible that the micro was turned on just as the refer compressor kicked on. i've seen that situation pop a fuse in microwaves many times - make sure you get a ceramic slo-blo fuse

Aug 22, 2009 | Emerson Black Microwave Oven

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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.

The power spike would have taken out the "monitor" fuse inside the microwave. This fuse protects the oven from door switch failure, if the switches fail it will blow this fuse so the oven can't be used. The purpose of this circuit is so that you can't run the microwave with the door open. This fuse is normally a low amp quick blow which is why it is susceptible to power spikes. This fuse can be replace but must be changed like for like, and is advisable to change the door switches as well. Good luck.

Jul 06, 2009 | GE Microwave Ovens

1 Answer

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
1200watts of microwave,
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 reccommends 20amp
not a solution, something to check,

Oct 14, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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:

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