Our Sharp microwave convection oven stopped working.
I removed top horizontal air vent plastic cover (pried off).
After removing the single screw over the control panel, I
lifted panel up about 1/2" and pulled away from oven.
After making a wire connector diagram, I removed the several wire
connectors from the back of the panel and removed panel.
Inside the space behind the panel is a fuse which was blown.
I removed the wire connectors to the fuse holder, cleaned
the fuse holder and replaced the fuse with the exact same
type. In my case fuse is 15 amp fast-acting type 3AB or ABC
ceramic type. Radio Shack p/n 270-1040 for package of 2.
Ours has blown twice in 4 years.