FUSE how to change the fuse

I would change the interlock switch under the door catch. They do intermittant things like this when contaminated.

By looking at it, if the metal strip is melted/broken the fuse is bad. Using a VOM to test it. Remove one side of the fuse from the holder, put one lead on each side of fuse. meter indicates 0.00 fuse is good, meter reading does not change fuse is bad. Electonis fuses can only be checke with a meter not visualy.

see this causes and fix it. God bless you
First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.

Fuse will be inside the oven.And with replacing fuse ,you need to check the cause of blowing the fuse.Check the capacitor and transformer (physically).If they look deformed .Then change it followed by the fuse.
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There is a fuse found behind the upper grill, it is likely a 20amp fuse.
If the fuse has blown, it is likely that the door safety switches need to be replaced.
Change the fuse (unplug the micro first) and continue using. If the fuse blows again, have it serviced by a qualified service person.

There is a fuse inside the microwave oven but i don't recommend opening the oven and changing it. There are high voltages inside even when the oven is disconnected from the mains.
But if you are careful enough, you can change it. If it has a electronic control (With a digital display) maybe there is another fuse on the controller board, near the front panel.
Before even opening the oven, make sure it doesn't work on another power outlet.
And make sure you change it with the same type and rating of fuse!

Go to any hard ware store for fuse or Home depot. If still dead it could be a bad magnetron, power supply or logic board. Home Improvement Made Easy with New Lower Prices Improve Repair

fuse is a easy fix, remove the cover, the fuse is located on the board. Most times the fuse is a indication of a bigger problem, sometimes a new fuse will fix if a power surge or metal in the oven caused the problem.

let me know what you find

A microwave casing can be removed and almost full access to the electronics with about 6 screws.... make sure to unplug it from the wall first.

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check the magnitron and capacitors one of this is bad