The primary thermal line fuse and high-voltage ceramic fuses inside a residential microwave oven are located directly inside the outer metal cabinet housing, typically mounted near the power cord entry point, attached to the metal framing near the high-voltage transformer, or secured directly on the main electronic control relay board. To access these fuses safely, you must first unplug the microwave from the wall outlet and wait several minutes for internal capacitors to discharge. You can troubleshoot internal components safely using a screwdriver. You can verify that you found the correct fuse when tracing the incoming power wires leads directly to the fuse holder clips.
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