Question about Sharp R-1502 Microwave Oven

1 Answer

Won't stop runnig.

Sharp R1502 Microwave will not turn off until you open the door. Everything else works fine. Lighting struck by our home. The breaker for the microwave was tripped.

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  • jasaxdad Jun 29, 2009

    I did not try to cook anything, so I really don't know. I do know the other things, fan, light work as they should normally. I can set the time for cooking. But since it runs no matter what (when the door closes), the time means nothing.

    Yes, the light, turn table, and the cooling fan comes on.

    I did do a check of continunity of the small transformers on the circuit board, and got 0.0 . I believe I should have received a least some sort of a reading.

    I hope I've given you the info you were asking for, if not let me know. Thanks.

  • William Miller
    William Miller May 11, 2010

    Are the inside light, cooling fan, and turntable all coming on with the door shut? Does it sound like it's cooking when the door is shut (and you have not set it to cook)? Does it heat water when the door is shut (and you have not set it to cook)?

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  • Sharp Master
  • 9,047 Answers

Sorry, but it's still not clear, yet I can narrow it down.

First I would suggest you check the top & bottom door switches and mounts. (Don't worry about the middle one)

We have the service / repair manual for this model and have uploaded it to our site here to help you.

It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.

Most computers will open this document automatically, but you may need the free Adobe Reader.

This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually 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 the switch mount is broken, it's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

If it's not the switch or mounts, I would say the contacts of relay RY1 on the control board are shorted.

It's called the oven lamp relay, but it also runs the turntable motor and internal cooling fan when the door is shut.

If you or a friend have soldering skills, you can replace it (of course confirm first that it is shorted).

It's part number RRLY-A113DRE0 (zero on the end, not "oh").

You can order it from Encompass here or you can call them toll-free at 866-779-5835.

If you prefer, we regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on Jun 30, 2009

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