Question about Dacor DMT2420 1200 Watts Microwave Oven

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Sparks inside the microwave when power is turned on

When I turned on microwave with food in the unit it made crackling sounds and sparks on the inside of the microwave

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  • 9,085 Answers

Quite often this is due to grease or food particles stuck somewhere in the cavity of the oven or stuck on or behind the waveguide cover.

It may also be in the area of the turntable support, coupler, or motor.

The waveguide cover (also called a spatter shield) is usually about the size of a playing card and often held in place by a plastic rivet.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If your waveguide cover is burned, it will need to be replaced.

It provides critical protection for the magnetron.

The service manual is here.

Let me know if you need further help.


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

Posted on May 16, 2010

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No. Please have it checkd as it is dangerous to let the high voltage jump along side the magnetron. This will eventually result in the failure of the magnetron with a possible damage to the circuits.
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By "powered off" can I assume you mean that it is plugged in and at idle, not cooking, just showing the clock?

If so, I'd say your control board is failing.

If my assumption is wrong, please write back with more details.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your model number) 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
prototech@usa.net
http://www.microwavedisplay.com

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