I am looking for a bottom door switch for my Sharp R-520KS microwave. I can not locate one. I have also tried the Sharp.partstore.com site. could you locate one for me? thanks lisa

You can tell if microwaves are being emitted if you get warm standing in front of it (seriously). But I wouldn't recommend that unless you want to cook yourself.

First thing that comes to mind is the door interlocks are out of adjustment or bad. Home microwave ovens are not supposed to operate like that. Some commercial models start the fan right away and run it after the cooking cycle is completed but I've never heard of a consumer model that does that.

Find your closest servicer here and have them take a look.

The fuse will be a 20amp ceramic. The fuse should be available at hardware stores, Radio Shack.
If the fuse is blown, there is a very good chance you have another problem, possibly a bad or misaligned door switch, shorted capacitor. Replace the fuse, if it blows again you will have to figure out why. Door switches are the most common reason for the fuse to blow.

There are three microswitches in the door latch assembly. One of them has failed (most often the lower one). With some mechanical know-how one can easily replace the bad switch with just a phillips screwdriver. There are two normally-open switches, and one normally-closed switch. They can be purchased off of ebay for about $10, and changed in 15 minutes.

Go to sharpusa.com and search for your unit, there you can look or download the instructions manual. I just did and it works. By the way you may check if there is no tape holding the door shut. If there are no obstructions you need to push the "One touch door open button" located at the bottom right corner of your unit if you are in front of it. It may be a little hard initially like many things that are tight when new. Good luck.

Sorry but its probably not worth it - consider cost of the part + cost of labour and you could probably buy a brand new machine.
Otherwise look out for a used machine from your local 2nd hand store, garage sale, refuse tip etc and get the part from that and do it yourself - MAKE SURE ITS UNPLUGGED.

Hi,
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips
http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

heatman101

omg i just got one and am having theeee exact same prob!!!!

Most likely needs a new membrane switch.

Part number FUNTKB445/KIT description "KEY SHEET", part is backordered, lists for $13.18.

Find Sharp service centers here.

That sounds like a door switch. Which switch is it? Top, middle, bottom?

Is your model number R1480? If not, please reply back with your model number so we can help you.

The door switches in model R1480 are:

QSW-MA110WRE0 top & bottom switches

FFS-BA016/KIT middle monitor switch with fuse (kit)

You can probably find exploded views and order parts by entering your model number here at the Sears parts site.

But the best place to order Sharp parts is Tritronics.

If none of this info helps you, please reply back with your brand and model number and let me know which part you need.

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It's usually the one in the center, as opposed to the being near the top or bottom edge of the door.

The entire service manual is available for free download on the Sears parts site (page by page) at http://www3.sears.com/ (the 3 is correct)

Just look for the switch as ref # 1-7 on this diagram:
http://tinyurl.com/yqc9ol

We're happy to help and we appreciate your thoughtful rating of our answer.