Question about Microwave Ovens
Yes. This is the waveguide cover, and it needs to be there to protect the magnetron from damage.
The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet or held in a slotted opening.
It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!
If your waveguide cover is burned or damaged, it will need to be replaced.
You can often find helpful exploded view diagrams and order parts by entering your full model number here or here.
Please write back with your brand and model number if you need further help.
We're happy to help and we appreciate your thoughtful rating of our answer.
William E. Miller, AS-EET
Posted on Apr 21, 2008
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Posted on Jan 02, 2017
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