Question about Sharp R-520LK Microwave Oven
Guru: Our microwave R-520 is doing similar, sparking from behind the metal plate on the side wall. The data plate says July 2007. I'm wondering how long the warranty is and should I let it spark and hum and generally raise h---? Some things it heats normally and other items it goes nuts.
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
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Posted on May 22, 2008
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Posted on Jan 02, 2017
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the microwave is sparking or arcing the waveguide cover might be
damaged and shorting out. Try removing the waveguide cover and see
if the problem goes away. If there are any damaged spots in the
microwave ceiling or sidewalls, repair them and paint them with
microwave oven paint. Replace the waveguide cover if it is burnt or
if it will not stay in place.
the microwave is sparking or arcing near one of the rack supports,
remove the support, repaint any bare metal, install a new support.
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