Inside the microwave on the right (next to where control buttons are) there is a panel with little round holes. I assume this emits the microwaves to heat. Inside that panel in began to smoke and spark and have an electrical burning smell. Microwave is almost 5 years old and has not had any issues. It was not empty and this not the "arcing" which is talked about in other posts/
If your positive it is not arcing behind the waveguide cover I would think it has to be in the control area. You will have to turn off power to the unit and remove the control panel and look to see if you can find any burn marks or soot, to indicate where your problem may be. I have found burnt connectors at the relays or even possibly burnt wires to the door switches. Careful! the capacitor on these can hold a charge for a long time and can shock you pretty good. Only work on something like this with the power to it off and the capacitor discharged. Microwaves do not come through the little round holes those are typically an RF screen to prevent microwaves from getting through. A lot of times that is where the cavity lamp shines through.
SOURCE: Kenmore over the range microwave 721.63684300 - nothing works
you must remove the MW take off the cover then look for a large metal can (capacitor) and a white (ceramic) fuse...look and, smell and, you should find the cause
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