Question about Sharp R-520LK Microwave Oven
This is usually due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.
When it gets heated repeatedly, it chars and eventually carbonizes.
Unless it sparks or is cracked or broken, it should be okay, but if you notice it getting darker over time, I'd order a new one.
You can order Sharp parts from Tritronics at http://www.wehaveparts.com
For other brands, 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.
William E. Miller, AS-EET
Posted on May 23, 2008
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Posted on Jan 02, 2017
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