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a blown fuse is a dead short of the circuit
it could be a failed power board , control board , megatron, light wire anything powered by the fuse
good advice is to take it in for a proper diagnosis and quote
Sounds like you have a shorted fan motor. Disconnect the power going to the fan and then try turning the microwave on again. Do not run the microwave for more than 5 or 6 seconds without the fan operating. If this does not cure your problem then the next most likely problem is either the AC Capacitor (silver can), or the Magnatron (4 inch square silver unit with cooling fins and thick wires. The voltage present on these two units can hold a charge in excess of 5000 volts, even after a time it is unpluged. Don't go near these unless you know what you are doing.
it maybe the internal fuse tht has blown all microwaves have a monitor fuse inside some where the mains power comes in and some on the control pcb it does mean that a short circuit has accured but it can happen if the door is slammed you will need to remove the top cover of the unit to find the fuse and be very careful inside everything is very sharp and door make sure it is unpluged also inside a microwave i a large capacitor this can store power even with the unit off it should be grounded b4 working on the unit but a long as you are just changing the fuse you should ok do if you can use insulated pliers for your own safety,if u fit a new fuse and it blows again thn my advise would be to take it to a a repair shop as the high voltage side of your microwave is up to 4000-5000 volts
if the microwave is on the same circuit as the refrigerator, it's possible that the micro was turned on just as the refer compressor kicked on. i've seen that situation pop a fuse in microwaves many times - make sure you get a ceramic slo-blo fuse
This microwave has three door interlock switches and a fuse that are easily replaced by the consumer. Unplug the microwave. Remove the cover by unscrewing the 5 screws on the cover. Four are on the back, one on the lower right. One or more of the screws may be torx T15S (security)(bit available at hardware stores). As in all microwaves the capacitor should be discharged by shorting the cap terminals together. Note that the three switches are in a single black plastic carrier. Remove the two screws securing the carrier and the switches can be released by hand. Replace one at a time so as not to confuse the wiring which is push on spade terminals. Replace the fuse with a 20 amp 125v slow blow (radio shack). Do not plug in power until all the switches are reinstalled as a safety feature will cause the fuse to blow again. If fuse blows repeatedly it is most likely that all three interlock switches are not closing properly. Check to make sure that all switches are seated correctly in the black plastic switch carrier and that the 2 carrier screws are tight. Observe the switches as the door is closed. Replace switches and/or carrier as needed. While the cover is off you may want to clean off the fan and/or replace the bulb. Also check for proper seating of the control board connections.
it may be just a fuse , but if the fuse inside the microwave blows again then there is something else wrong and it would need to be tested to find the problem and fix it
so the fuse inside needs to be check and or replaced and if the microwave powers and works ok after replacing the fuse , then the other fuse was just bad
I have replaced the main fuse on this model. Though blown main fuses are common in this model, it will not even turn on when they blow, so your problem is most likely NOT a blown fuse. I had heard of your problem so, when replacing the main fuse inside one, I looked for additional fuses and saw none. The store was wrong. Even if it were a fuse, the security Torx screws mean that you couldn't replace the fuse anyway.
This microwave seems to have been haphazarly been recommended by Consumer Reports, but it is terribly unreliable. The turntables break when popping popcorn, the main fuse repeatedly blows, and they also stop heating.
Call any service center that services appliances or most any electronics parts supplier. You will have to know the specs of the thermo fuse to order one.
If the thermo fuse is blown, most likely there was an overheating condition, and there is a failure somewhere. This can be a serious safety issue. When you change the fuse, it may blow again. It would be best to verify the specifications and for proper operation of the unit before using it again. A qualified service center for microwave ovens can do this for you.
Is the outlet ok? Can you plug somethng else into the outlet to see if the fuse or breaker controlling the outlet is ok? If there is power at the outlet, unplug the unit and remove the outside cover.
Look for a blown fuse on the motherboard. Replace it with the EXACT value of the original fuse. You can purchase a new fuse at Radio Shack or hardware store or auto parts store. Try powering up the unit again and see if it works now or whether the fuse blows again. If it blows again, the power supply may have been damaged. Was this a power outage or surge? Was anything else in your home affected?