Question about Sharp R-1874 Convection/Microwave Oven

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Sharp Model 1451 blown power fuse

Power fuse blew and after replacing it I found it blows almost immediately. I turned the turntable off and it still blows almost immediately.

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1.Problem with monitor door switch or
2. Problem with high voltage condenser.

Posted on Dec 01, 2008

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What causes microwave to blow new fuse?


The only thing inside a microwave oven that draws enough current to blow a fuse is the magnetron that generates the microwaves to provide the cooking power. Based on the age of the unit (approx 15 years) it is most likely best to just replace it as repairs at that level are not cost effective. Newer units cook better and faster using less power these days.

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Hard to say what blew the fuse, suggest you replace the fuse and if it blows again take it in for service

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Why is my GE Advantium SCA2001 blowing the main fuse?


Yeah pal, you've not gone deep enough yet. You'll find a power wire bare inside the unit, pull it apart and tape that wire up to stop it from grounding out and blowing the fuse.

Aug 31, 2014 | GE Microwave Ovens

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GE Advantium 120 SCA1000DWW03 blowing 20amp fuse


Our unit was doing the same thing,
took it into the repair shop, they said there was nothing wrong with the unit, replace the main breaker that supplies power to microwave and try again.
Sure enough the breaker became defective, and we never had issues with it before, but now the unit has not had a single problem.

Feb 13, 2014 | GE Advantium SCA1000H Convection /...

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The internal 8a ceramic fuse has blown on my Sharp platinum collection 900w microwave oven, model R-957. fuse is marked F8AH 240V and is located on a small circuit board inside the rear of the oven. is...


Don't know if this a regular problem with this unit, but for this fuse to blow, there must be a problem further downstream. Maybe with the power supply or the Magnatron.

Sep 07, 2010 | Sharp R-1874 Convection/Microwave Oven

1 Answer

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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Blown fuse


Check your door switches or your turntable motor, these could also cause the fuse box to trip.

Mar 25, 2009 | Sharp Microwave Ovens

1 Answer

Using Convection Oven and lost power Sharp R-7A85


Replace fuse with slo blow from Ace Hardware. Plugged unit in, clock worked. Turned unit on and immediately blew new fuse. Will fix it with a new unit.

Mar 21, 2009 | Sharp R-7A85 Microwave Oven

1 Answer

Fuse blows when I press ''Start''


Okay, the part you're describing is the magnetron, and you'll not find one cheap.

The good news is that this is probably not your problem.

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 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/xformer.html

The best place to order Sharp parts is Tritronics. You can also call them at 866-779-5835

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

Nov 21, 2008 | Microwave Ovens

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