One of my microwave light under the microwave are blowing off with a big flash. The microwave still working after that, but the other light still on when I press the button to turning off. I decide to change the lamp in the other socket, to see if it could work, but at that time an another spark coming and now microwave are not working anymore. Did they have a fuse somewhere in the microwave, because everything is OK on my electric plug.

If your model is NN-P295SF, then the service manual is here.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line.

Sometimes you get lucky and only a fuse blows, but either can cause a failure on the controller.

We often see this problem on the control panel, which we regularly repair by mail for $39.95 postpaid with a one year guarantee.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.