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Yes! there is a main fuse, it is located under the keypad and in towards where the high voltage capacitor is "silver and rectangular in shape" but make sure oven is unplugged and high voltage capacitor is dis-charged because there are dangerous high voltages in that area. But I think you have a secondary problem in the oven, there might be a defective door switch or possibly the high voltage capacitor has shorted.
Generally, there are one of three failures.
Blown fuse in the Magnetron circuit.
The main capacitor failed (Required to power the magnetron)
The Magnetron itself has failed.
My local appliance repair guy helped figure out my last microwave failures. Once was the fuse the other was the capacitor.
The fuse was a couple bucks, the capacitor was $25 or so.
Generally, if you are not familiar with repairing a microwave, it is best to take it to a repair shop to be evaluated/repaired as it is real easy to get shocked working on one.
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. Either can cause such a failure on the controller.
This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.
Details of our service and critical safety information and disassembly information is at our site, linked here on Fixya: http://tinyurl.com/yzjozk
You have one or more defective door switches, or the door switch mount is loose or damaged.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383