Question about Sharp R-510HW Microwave Oven

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My sharp r-510hw flashing like crazy

My daughter cooked her microwave popcorn.Then she put a small amount of butter in a bowl to melt.aprox 5 sec the microwave was flashing.Removed butter checked inside for metal or other foreign matter did'nt see anything.Hit start with it empty ,and it started flashing again.

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  • may3042 May 28, 2008

    I have sharp r-509fw with a similar problem,,,it flashes so much that I don't set the clock anymore..the cover for the waveguide cover is missing. could this cause the flashing> if i close door 2-3 times reset the time (cook) 3-4 times, push start gently ,I luckup w/hot meal.....once on, it works to time completion..except every now& then.....is the cover missing my problem?? sharp wants $13 for the little piece of mica plastic..Ill pay , if, thats the problem. thanks richard nowling bluebird6342@yahoo.com I cooked dinner tonight.5/28/08

  • Anonymous Dec 26, 2008

    microwave was working fine, melted some chocolate chips in pyrex measuring cup, worked fine.Put back in microwave after stirring, turned microwave on & huge flashes occurred. No visible damage or dirt in oven. Put water in a cup & turned on & flashing occurs again. Do not use micro wave for 24 hours, now heated a cup of water & it appears to be working fine!! This is a Sharp R-510 HW 1200 watt.

  • flbr Jan 28, 2009

    Bright flashing whenever I use the microwave, whether something is in it or not. Very scary! I will not even turn it on until I know what the problem and solution is.

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  • Sharp Master
  • 8,820 Answers

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.

The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.

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.

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 order Sharp parts from Tritronics at http://www.wehaveparts.com

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Mar 30, 2008

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