Question about Magic Chef MCD1311ST Microwave Oven

2 Answers

Microwave does not cook

I think the magnatron is defective. Is there any kind of reset?

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The magnetron should have a thermostat or some other kind of heat protection device on it, but if it is activated, it will open up the power line, making the oven truly dead until it cools down.

So if it's dead, it may be a fuse or a thermal cutout / thermostat.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

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

Posted on Mar 04, 2008

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My microwave oven (Sharp R-9h58) is working sometime fine and sometime not heating. What will be the problem?

Posted on Jun 17, 2009

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1 Answer

The microwave comes on and seems to cook but does not cook . It makes a very loud humming noise and the turntable goes around but there is no heat to cook anything.


you either have a bad magnatron, that is trying to heat but won't or you could have a capacitor or diode (rectifier) that is bad. if you order a magnatron replace capacitor and diode (rectifier)

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There is an inline fuse that is accessed by removing the outer casing. Follow the power line in to the magnatron and you should see the fuse. Make sure the fuse that you replace it with is the same as the one you removed. If this doesnt work then the magnatron has gone out.

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I think you should check the fuse first that runs the magnatron if the fuse is good that means the magnatron is bad! but if its only the fuse then you save time and money!

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This is a sure sign that the Magnatron has burnt out and needs replaced ( This is what cooks the food!) Replace magnatron in oven unit and all should work well!
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Magnatron is suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing the magnatron. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"

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Magnatron is suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing the magnatron. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"

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