Replace door latch on sharp microwave R-520KS

You need to replace the control panel, the panel is all one piece buttons and all.

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.

Did you disconnect and test the three latch assembly microswitches with a multimeter or continuity tester? The top and bottom switch are normally-open, and the middle switch normally-closed. The lower switch seems to be the one that takes a beating and most often fails. It should be an Omron D3V-16G-3C25 and can be found on eBay for $10, or via an electronic parts supplier.

It should be an Omron D3V-16G-3C25, you can google that number and find a few electronic parts suppliers who sell them in a quantity of one. Likely the cheapest route is to buy off of eBay where I see them for $10 shipped.

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.

The door does come apart. Open the door and where the hinges are, there are openings where the hinges enter the door, this plastic piece (goes all the way around the door) With a small flat blade screws driver VERY carefully pry it (plastic) off, once off, check the latch end for the spring, typical failure for a Sharp is the little tab that the spring hooks to on the door, the only way to repair this so it will last is to replace the door frame. they are not too expensive, about $50 or so Part# FCOVB166KIT
is the door frame assy