“What is this plastic waveguide cover inside the microwave? Am i suppose to remove it?”
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If you are referring to the cream-colored plastic cover inside the Insignia™ 1.1 Cu. Ft. Countertop Microwave, do not remove it. This cover is attached to the microwave cavity to protect the magnetron, which is a crucial component for the microwave's operation. Patricia | Insignia Support
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