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there is an internal fuse in this, the go all the time and is very common, #1 on this diagram, a word of caution though please read this,
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.
/!\ WARNING ELECTROCUTION HAZARD HIGH VOLTAGE Removing the cover of your microwave oven and touching an electrical part can kill you. Have a professional repair your microwave oven
please consider a service call for this repair, thanks Bryan
the fuse is marked #1 on the diagram if you follow the power cord into the microwave its in the inside of the machine and part of the power cord, there will be a plastic case around the fuse.