Almost all of the burns discovered within microwave ovens are a direct
result of splattered food debris which is not effectively cleaned off the
surfaces. Occasional some of the material will carbonize as a result of
being cooked multiple times. When this occurs it will damage the painted
surface and the wave guide cover. Cleaning of the cavity's surfaces normally
will remove cause and therefore the resulting damages.
"Sam Goldwasser" wrote in message
...
"li_gangyi" writes:

On the topic of waveguide covers....what is it used for?? I assume it's
the
shiny copper coloured piece stuck to the sides of the oven where the
microwave comes out...and why does it burn out?? Thanks in advance.

Maybe, the waveguide cover is a plastic or mica plate that covers the
waveguide
exit to the oven cavity. It's basically just to prevent spatters and such
from getting into the waveguide.

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