Question about Sharp R-520LK Microwave Oven

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Microwave solutino Guru; I cleaned the oven, although it was not unduly dirty. However, the wave plate did have discoloration, like burn on the inside of and trying to blemish on the outside of. I cleaned it as well and it did clean up pretty good, but with still some discoloration on both sides. But, the oven now works! I'm thinking it might be a good idea to replace the wave plate, unless you advise otherwise. I'm curious to why the wave place discolored, or got excessively hot, in the first place? Thanks for your help! Bill

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  • Sandra Aug 17, 2008

    ours just quit while it was warming dinner after I heard a cracking sound

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  • 8,820 Answers

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
prototech@usa.net
http://www.microwavedisplay.com

Posted on May 23, 2008

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Microwave sparking, etc.


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

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 the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

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

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.

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