JTP90BM1BB General Electric Microwave Oven Combo - Overview

Turned out the issue was easily solved by replacing a single, inexpensive fuse.

First off, UNPLUG THE MICROWAVE.

The fuse is located under the plastic grill at the top of the microwave. It's held on by two screws. Once you've removed the screws and taken off the plastic grill, you go to the right side of the microwave and remove another screw that holds a small metal grill in place. Removing the small metal grill is probably the toughest part of this repair. You kind of have to rock it back and forth a bit to get it to release. Once that's off, you can get to the fuse. I removed the burnt out one with a pair of needle nose pliers. I also put a small piece of cardboard under the fuse when I did this so I didn't accidentally drop it into the innards of the microwave. I did the same thing when I replaced the new fuse. I then plugged the appliance back in and made sure it worked. Once that was confirmed, I replaced both grills.

I had to remove the oven from the wall because the sensor plug connction is behind the unit. Two screws hold the sensor inside the oven and then I disconnected the lead and pulled the sensor out from the front. I installed the new sensor, tightened the two screws holding it in and connected the lead. Then reinstalled the oven into the wall. Overall, a very easy repair once you get the oven out.

Replaced High Voltage Diode. Very carfully due to the extream danger of a electrical shock.