My built-in above-the-oven microwave has no power. When I replaced the internal fuse, power came on but would not shut off unless I opened the door. With the door closed, the inside light and a fan stays on. When I set the cook timer and pressed start. There was an additional deeper motor sound as if it just started cooking. This makes me think that the previous sound was just a cooling or ventilation fan. This deeper sound only stayed on for a moment when the whole thing went dead again. No lights, no beeps, nothing. I hope this makes sense.

There was no model number on the microwave itself. The model number listed came from the lower oven. A sticker inside the microwave has a manufacturer date of 1994.

Please help,
Caleb

Thanks for the advise, Gene. I tested the HV Cap and it seems to be ok. Could the door switches alone be the cause of the fuse popping? Can they be tested? Also, what other components can I test with a simple multi-meter?

I'm just trying to rule out as many things as possible so I'm not just buying parts at random.

Thanks Again,
Caleb :o)

Hi again, I've tested the 3 door switches and they seem to be good... I think. One is closed when the door is open, and open when the door is closed. The other two work exactly opposite. They are open when the door is open and closed when the door is closed... or maybe I have that backwards. At any rate, they each have an open state and a closed state.

So... the door switches and HV Cap have turned out to be ok.

What's next? :o)