It is probably the main fuse. You'll have to remove the microwave and take it apart. There are several screws around the microwave that you'll have to remove. Just be sure when you take the scres out you know where they go back because they may or may not be same size and they have to go back exactly where they come out. Once you get the cabinet off the frame follow the power cord up until you see the fuse. It will more than likely be a ceramic fuse around 20 amps, take to maybe a lowes, home depot or radio shack and one of these will have the proper fuse.
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