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There is an in-line 15 amp fuse wired into the power circuit. If you send me the brand name and model number, I look for the necessary technical information I need to assist you. Thank you.
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The thermal fuse you are testing is probably the fan switch. It only closes when the heat from the cooktop below gets too high and then it closes to turn the vent fan on. If the microwave was plugged in when you replaced the bulbs, it likely damaged the main control board. Do you have voltage at the fuse and to the control from the fuse?
Test the power on the wires on the large black relay on the board, measuring from each wire to ground. Do you read 120 VAC?
Hello, I see this question is still open and I was just following up to see if you require further assistance.