원문 게시자: Steven Goldstein ,
I removed the waveguide cover from my Sharp Microwave as suggested and found carbonized material on the surface that faces away from the oven cavity. It was somewhat baked on so I cleaned it, first with a wet cloth, and then scoured it with an abrasive sponge. When I reinstalled the cover and tried using the oven the problem was completely resolved. Thanks for this information.