I have the same problem. I googled a fuse company (1-800-739-9145) that specializes in fuses, and they say for a ceramic fuse, all they have in the 3/4" is 12.5 amp or 16 amp, and they cost $20 plus maybe $6 shipping. Heck, you might as well buy a new microwave. America is unbelievable, aye?
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remove the outer cover and the fuse is either on top or on the side in a fuse holder clip,it takes a special "ceramic-fuse" available at hardware stores, if it blows again.suspect a h.v. capacitor,diode,magnetron, or exposed wire arcing
Sounds like your fuse has blown. Remove the unit if it is an undercounter unit. Unplug. Remove the case by taking all screws out. You should see the fuse in a holder on the top or on the side where the electronic boards and display are. Check the value and replace with a ceramic fuse OF THE SAME VALUE. The fuses are special fuses and are not glass fuses for a reason. They are ceramic (you can't see through them). You can get the fuses at www.mcmelectronics.com . Let me know if you need more help.
unplug unit first!!!!dangerous voltages inside up to 2000 volts at cap terms, remove outer cover and fuse should be on top or near corner and side of unit/you need a special fuse available at most hardware stores and radio-shack stocks them,they're called a "Ceramic Fuse"
If there is no sign of power at all it may be that the fuse for the internal power supply has blown.
These are normally a special ceramic type and I have seen these simply give up when a microwave oven door is slammed shut a bit too hard. Recently happened to me.
The fuse should be visible as soon as you have removed the main casing. They are a special ceramic type. Normally if you look on the circuit board where they are mounted on you will see the rating for the correct fuse.
Try this first, If it fails again then something is drawing too much power and it should be further investigated by a service engineer.
The microwave oven use a slow-blow fuse. If you look on the around the end of the fuse, you will be able to tell what size it is. Example (250v 3Amp) Your fuse may be found at Hardware stores in the electrical isle or a Radio Shack. If you found my suggestions to be helpful, please rate my solution. Thanks D. Lange