SOURCE: Waveguide cover
If it's damaged and cleaning won't take care of it, you can buy a new waveguide cover from Tritronics at http://www.wehaveparts.com
We have the full service manual at our site for your convenience:
http://www.microwavedisplay.com/r820bc_bk_bw_sm.pdf
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: magnetron tube and mica waveguide cover
Unfortunatey unless the unit is a high end oven by the time you pay for the parts and labor you could probably get a new one. Don't forget if you have to replace these parts already who knows what else is about to happen. I hope this helps you out.
SOURCE: Sharp R403 microwave internal electrical short/fire
This is a simple problem & solution.
Quite
often this is due to grease or food particles stuck somewhere in the
cavity of the oven or stuck on or behind the waveguide cover.
The
waveguide cover (also called a spatter shield) 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 and dried thoroughly.
Then you can apply some
high-temperature appliance paint, available from places like Wal-Mart,
Lowe's or Builder's Square.
Since your waveguide cover
is damaged, it will need to be replaced. It provides important
protection for the magnetron.
You can order parts from Encompass here or you can call them toll-free at 866-779-5835.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: There is a rectangular cover on the ceiling of the
It is the waveguide cover. Some manufacturers call it a splatter shield or spatter shield.
It will need to be replaced. It provides critical
protection for the magnetron.
You can find
links to helpful exploded view diagrams and part ordering help
here.
I'd recommend that your bookmark this link to your favorites.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
If
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.
If
the microwave is sparking or arcing on the side walls the paint
might have chipped causing pitting in the metal oven wall. Use
microwave safe paint to touch up any bare metal spots.
If
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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