Question about Panasonic NN-T990SA Microwave Oven
If heating fatty substances (melting butter for example), as the product on the turntable gets near the area where I assume the MW waves come out (a square in the center of right side vertical panel inside, covered with a removable panel of some strange material) a brilliant flashing and the sound of heavy electrical arcing (1 to 2 sec., off and on) takes place until the product rotates out of proximity to the panel. I removed the panel and cleaned it pretty good and for a while things were fine. Now it is doing it again and freaking out my wife. She wants a new MW, I want to easily fix it. By replacing that panel with a new one will the problem go away? I had read that food built up on the surface can cause this and cleaning it seemed to help the first time. Ever heard of this?
You're on the right track. That panel is the waveguide cover.
This is usually due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover in the waveguide just out of sight.
It can be fragile, and the metal edges 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 the cavity metal of the oven is chipped or charred, it will have to be sanded smmoth and clean.
Then you can apply some high-temperature appliance paint, available from places like Wal-Mart or Lowe's.
If your waveguide cover is burned, it will need to be replaced.
To order Panasonic parts see http://www.pasc.panasonic.com/epartr
Posted on Nov 18, 2007
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Posted on Jan 02, 2017
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