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see the informaton with carefully and use the common sense: God bless you When
the microwave sounds okay, but there's no heat, one of the internal
door switches, the high voltage circuitry, or the circuit board may have
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 .
If you hear an unusual buzzing noise, the magnetron (the component that actually generates the microwaves) or other electronic module may be broken. This is not easily fixed; contact a service technician.
If there is no noise at all the fuse may need to be replaced.
UNPLUG YOUR MICROWAVE BEFORE WORKING ON IT...
Read the owners manual to locate the fuse, remove it and take it to a parts supply store. Let the technicians test the fuse for you. If ti is bad, they can give you a new fuse to install. If it is not the fuse, they can recommend a reputable repairman to service your microwave.
Is it totally dead? No display? Or just does not cook? If it made an unusual noise before it 'died' something probably shorted out.... You need an ohm meter to troubleshoot. If the fuse is open, switches and HV circuit need to be checked before replacing fuse. Sometimes on the convection Microwaves (not just Sharp) the fuse will 'rust' and open rather than blow. Or the fuse holder can over heat and fail.
Yes, There are fuses inside the keyboard panel. I would have to take a look at the manual for the specific model you have to identify the easiest way to check the fuse. Before you go that far check above the hood and see if you can locate the plug end of the microwave. Most installations have a dedicated receptacle above the exhaust vent and microwave. It is usually a space too small for good storage so most housewives store small items and cookbooks in this space. It is usually the culprit for a microwave suddenly going out without someone placing metal inside the oven and heating it. Heating a metal object or operating a microwave for an extended time will usually blow the fuse.