Question about Magic Chef MCB780W Microwave Oven

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Sharp Carousel R-530CW

I've had this unit for over 9 years and it still cooks great, but now it runs the fan, light and turntable even when cooking is done. With the door closed, the llight, fan and t/table runs continuously, but not the magnetron. You can set all controls and hit START and the magnetron comes on and cooks as usual, but when it stops and the beep goes off, the fan, light and t/table keep running. We leave the door open until we're ready to use it. Does this sound like a simple, inexpensive fix, or one where a control board has to be replaced, probably at a cost rivaling a new unit?

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Hi, I am not sure of the cost concerning the control board, however, it does sound like a control board problem, or a door switch problem, I would need to see the specific unit diagram to know for sure, but many microwaves, not all, but many, have a door switch related to that part of the circuit, usually the fuse would blow at that point, but there again, it depends on the circuit. I would suggest you get the unit checked soon however. Hope that helps somewhat, and thank you.

Posted on Jan 24, 2009

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MODEL R-395Y sharp carousel microwave not working. All power outlets are fine. Please help, cheers lyn


I was unable to locate a service repair manual specific to your microwave; sorry.

You'll must likely have to find a Sharp service and repair center.
I've attached a link that contains the user's manual to your microwave...it has the phone number and address of Sharp; perhaps you can phone them and ask where a repair center is located.

This is the diagnostic check list Sharp recommends before calling for service:
SERVICE CALL CHECK
Please check the following before calling for service:
1. Does the display light up?
2. When the door is opened, does the oven lamp come on?
3. Place one cup of water (approx. 250 ml) in a glass measure in the oven and close the door securely. Oven
lamp should go off if door is closed properly. Press the INSTANT COOK/START pad once.
A. Does the oven lamp come on?
B. Does the cooling fan work?
(Put your hand over the rear ventilation openings.)
C. Does the turntable rotate?
(The turntable can rotate clockwise or counterclockwise. This is quite normal.)
D. After one minute, did an audible signal sound and COOK
indicator go off?
E. Is the water inside the oven hot?
If "NO" is the answer to any of the above questions, please check your wall socket and the fuse in your meter box.
If both the wall socket and the fuse are functioning properly, CONTACT YOUR NEAREST SERVICE CENTRE
APPROVED BY SHARP.

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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.

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See these files:
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http://www.microwavedisplay.com/disassembly.txt
http://www.microwavedisplay.com/doorsw.txt

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Then you can get to the switches.

Or it may be a sticking relay on the control board. We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

If during this unwanted operation the oven lamp, internal cooling fan, and stirrer are all stuck on, but the turntable is not on moving and the oven is not actually cooking, then I would suspect relay RY1 on the control board is stuck.

That's what I suspect in your case.

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