Question about Microwave Ovens
This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a problem on the control panel.
Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.
There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.
The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.
Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.
If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.
You can probably find exploded views and order parts by entering your model number (R-520JKF) here at the Sears parts site.
The best place to order Sharp parts is Tritronics.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Aug 21, 2008
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