Question about Sharp R-1880LS 850 Watts Microwave Oven

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Unit dead Unit is dead - suspect blown fuse

THe unit went dead after blowing a breaker due to overload conditions. I think the fuse may have blown inside the unit. Where is the fuse and how do I get to it?

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Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.

The reason for this is that if you do not have any experience and training with microwaves, you can get a SEVERE shock, even if the oven is unplugged. THAT being said, if you still want to know where the fuse is get back to me. good luck.

ALSO, as you may know, a small microwave these days is under fifty bucks at walmart.

Posted on May 20, 2009

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Blown fuse inside of unit. Must find out why fuse blew, something shorted or bad connections.

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If it's totally dead, the main fuse may have blown. However, since it was inconsistent before it went dead, it might lead me to think that you have a loose connection. Sometimes they heat, lose continuity, and then work again when they cool. A defective thermal protector might also cause this.

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Microwave just stopped working while in the middle of cooking. clock and inside light went black - nothing works!


You could have over heated the microwave or blown a fuse due to a problem in the door circuit. Either way this can be repaired with minimal parts. I would suspect you blow the fuse to the cabinet due to temperature where to high in the unit. I would need a model number to assist you further..
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Aug 03, 2011 | Kenmore Microwave Ovens

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Was baking at 450 degrees and entire unit went dead. Confirmed outlet power is ok. Took off front grill but can't see anything obvious. Can see a fuse, could that be blown??


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Best of luck.

Jan 20, 2010 | GE Advantium 120 Convection/Microwave Oven

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NN-A774SBBPQ Invertor & Cat-Clean model.


no 3rd fuse as far as i know just the two on the mains pcb and the plug i would test all three fuses again but if the short has gone back up to the control panel them that might be why its not coming back on if it has blown the control pcb it will show up as ablack mark on the pcb sorry cant be nore help its the sort of thing i would need to see as it could be a door micro switch as well gd luck dont forget to unplug the unit

Oct 05, 2009 | Panasonic Microwave Ovens

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My LG microwave went completely dead. I is only 3


under the outer cover,its either a 10-15-or 20 amp ceramic safety fuse avail at most hardware stores, the amp rating is on the side of the fuse, if the new one blows then either the H.V. diode/capacitor or the magnetron can be suspects

Oct 03, 2009 | LG LMV1630ST Microwave Oven

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MW8115SS worked perfectly and then went dead


Blown fuse , take the outer cover off and change the fuse. Iff you don't have a fuse use a piece of tin foil until you find a replacement fuse.
Hopefully this helps you out.

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Reset for GE Microwave?


There's no other reset function. If a reset (unplugging) does not correct it, it will need to be repaired.

If it's less than one year old, it should be fully covered under warranty. I'd suggest contacting the manufacturer to get it fixed free. GE Customer Service is here.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

I would suspect a blown fuse or the magnetron;s thermal cutout / thermal fuse.

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

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Sharp R1420B Totally dead. Power to unit is ok.


Most of these have internal line fuses inside of the casing. Once you remove the housing that covers the top and sides, follow the wires from the cord and they should lead you to the fuse. They are usually on the front rh side looking at it from the front. Be careful, even though unplugged, this unit still stores alot of electriacal energy in the capacitor.

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1 Answer

Blown Fuse


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.

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

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