yes there is a fuse in this. these are dangerous to work on but I believe the fuse is you problem ,
please read this carfully before attempting any microwave repair,
Consumer Product Safety Commission
Electrocution Hazard with Do-It-Yourself Repairs of Microwave OvensCPSC Document #5061
The U. S. Consumer Product Safety Commission (CPSC) warns against do-it-yourself repairs of microwave ovens. Each year, on average, four people die from electrocution trying to repair their microwave ovens. Microwave ovens use high voltage which makes it particularly hazardous for consumers to remove the cover and touch electrical parts. The possibility for electrical shock from a microwave oven still exists even after the oven is disconnected from the power source. Should certain internal devices fail, even unplugged ovens can cause serious injury.
The Commission strongly recommends that consumers have professionals repair microwave ovens because electrical appliances can be hazardous if consumers expose live electrical parts.
Removing the cover of your microwave oven and touching an electrical part can kill you.
Have a professional repair your microvave oven , the fuse should be located right behind the control panel in this model, unplug the microwave before opening the panel. there should be screws holding the top vent above the door remove these ,(sometimes there hard to see.) then there should be one screw holding the control panel, take that out and lean the control panel faorward, the fuse should be in the top behind the panel, be safe, thanks ,Bryan