Question about Magic Chef CMV1000B Microwave Oven

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Lost total power of microwave wondering if it could be a bad fuse?

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Check fuses

Posted on Mar 31, 2014

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There is a white ceramic fuse hidden in the control panel area that is likely the culprit when total power is lost. You will not find a word regarding this fuse anywhere in your owners manual, but all microwaves have them. You will need to remove the outer shell of the microwave to access it. Once you have located and removed it, you can check it with a multimeter set to continuity. If it is blown, the replacement must be another ceramic fuse. Because of the high amperage that this fuse carries, if you try replacing it with an automotive type glass fuse and it blows, it will explode and scatter glass from the fuse throughout the insides of the control area.

Posted on May 09, 2014

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If you feel confident enough in your electronic skills (metering, soldering, etc.), unplug the oven, remove the screws that hold the cover in place (usually along the backside outer edges - depending upon the model of over, and have a look at the circuit - starting from the point where the power wire enters the oven and connects to the transformer. As you follow along, you might encounter a fuse, either inline along the power wire, or in a bracket on the circuit board. Look for any obviously blown/burnt component (typically one of the small electrolytic capacitors). If you have a multi-meter, and know how to use it, all the better. Simply work your way along the circuit until you find the short/break.Note the value and voltage of the component and order a replacement (I user Mouser). Or you might get lucky and find that something is loose. It happened to me a month or two ago, when I popped open a very new microwave a friend let me have that appeared totally dead. When I opened it up, I found that the power connection to the control circuit board was ever-so-slightly eschew, apparently from being dropped. I snapped it back in place, and it's been working like a champ ever since.Good luck!

Posted on Apr 03, 2014

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