Common Symptoms of Waveguide Cover Failure
Sparking and blue flashes around the waveguide cover due to a build-up of Fat & food splashes.
It is important to check for damage and burns in the cover. If this is not replaced continued use will cause burning the waveguide cavity and failure of the microwave.
This 200mm X 120mm sheet should fit most domestic microwave ovens.
Remove the damaged/burnt cover and use as a template to cut out a replacement from the sheet suppled. If the old waveguide cover is very greasy make a paper or card template rather than getting your new cover greasy.
The mica sheet cuts easily with scissors or a craft knife. The form any screw hole either use a drill bit by hand or a small screwdriver to form the hole.
Remember to clean the microwave before assembly of your new cover.