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They do have a fuse. They also have thermal cutoffs and possibly a thermal flame sensor fuse. the main fuse would be near the control panel the thermal flame sensor is usually near the back of the cavity usually on the left side on the outside of the cavity.
(would really like more info- digital number dead as well?)
(assuming completely dead) Could be a couple of things:
- blown fuses (inside, relatively easy to replace, std size avail at Raioshack) <-- most likely
- cut/loose power cord connection inside.
- (unlikely but worse case scenario) Door was closed crooked- one tong hit one door switch before the other- causing a short circuit internally that "self destructs" the microwave to prevent it ever operating with an open (or even crookedly ajar) door, irradiating any users. Typically it just blows the fuses, but if fuses blow immediately upon replacing and turning power on, then possibly one of the switches fused or melted internally, and needs to be replaced.
It very well could be a blown fuse. I assume you checked power at the plug and checked the breaker. Also I assume and over the range micro. To get to the fuse you need remove the grille above the door then you should see a screw holding the control panel in place. Remove that screw and tip the panel out and you should see the fuse ( sometimes two) just inside the cabinet. remember to unplug or turn off the breaker before doing any repairs. you can goto - http://www.searspartsdirect.com/partsdirect/index.action - to find a parts breakdown and order parts.
When you say that you checked the circuit breaker, can I assume you meant the one for your home? There is a fuse in the microwave. Typically it is a 20 Amp fuse. To check it you will need to open the cover. A word of warning, there are some high voltage components like the capacitor that should be discharged before working on this device. If you are not familar with electronics, then you should take it to a qualified service person.
Maybe there's a problem with the power transformer or the power PCB [ Printed circuit board ] . Or it could be just a fuse . You need to check first . If it's the fuse , then that will be easy to solve , you need only to replace it with new one . But if the problem is with the transformer or with the PCB , you need to take your microwave to the service for repairing .
To locate the fuse, remove the outer cabinet of the unit, which is usually held in place with a few screws. Once the outer cabinet is removed, follow the power cord into the unit. It will take you to the fuse holder, where the fuse sits. The fuse holder is located two or three inches into the unit, and may be attached to a power board .