My microwave just died. There is indeed power to the outlet but the microwave does not work at all. Is there a fuse that can be changed and if so is this something I can do myself instead of calling a service repair person?
I've got the same model and the same problem. Inside the microwave the Noise Isolation transformer shows black carbon from arcing on both sides of the PCB, but only no one pin.
It looks like a short to me, but I'm not sure what to replace. It appears this might be a common problem.
Fixed a dead one. Main 20A fuse blown. Last use pulled open the drawer while microwave was running. Luckily in my case, all 3 door latch switches tested fine per service manual check (link below). Also tested across big yellow cap to confirm no short (wait 10s of min for cap to discharge, then discharge its +- solder joints with a screwdriver, need to pull board out to get to cap solder points on the backside) Replaced the fuse and all is running.
The door latch switches are a common failure and popular repair item. The reason is the poor design where safety cut off switch becomes a frequently used method to open the drawer. Here is a popular repair kit with fuse and door latch switches
https://www.repairclinic.com/PartDetail/Door-Switch/FFS-BA018-KIT/4454521
These door latch switches are rated at 16A and circuit diagram shows main power runs through them. When you pull the door open in mid operation, its like disconnecting a high current circuit mechanically and will gradually arc weld these mechanical switches together. Hence damaged switches are frequent cause of the blown fuse. Design is reasonable for infrequently safety usage. Unfortunately, in pulled drawer microwave ovens, it becomes common use model. To avoid problem in the future, always shut off the microwave via front panel before pulling open the drawer.
All 3 drawer latch switch test are outline on page 17 of service manual
KB6524PS_PK_PW.pdf (nationalservicealliance.com)
HomeDepot 20A microwave fuse here
Cooper Bussmann ABC Series 20 Amp Fast-Act Microwave Fuses (2-Pack) BP/ABC-20 - The Home Depot
There is a fuse. It is 20amp. It is not readily accessible; you must remove the U shaped case to access it by removing about 15 screws, a simple task with a screw gun.
SOURCE: microwave stopped working
Chances are the thermal cutout (thermal fuse) on the magnetron opened up. It may or may not also indicate a bad magnetron. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
SOURCE: Sharp Microwave problem.
A microwave can be dead for many reasons.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.
If it's intermittent or random, it may be a bad connection, usually on the control board or fuse holder.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.
If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
We appreciate your thoughtful rating of our answer.
SOURCE: Microwave possible blown fuse??
If you still have this oven and need repair, we can do it for $39.95 nationwide or about $25 more if it needs a new transformer.
We repair these and various other models all the time with the same situation for RV owners & dealers across the country.
We have full details, plus *critical* safety, disassembly, and troubleshooting info at our site. You'll find a link to our site in our listing here on FixYa: http://tinyurl.com/yzjozk
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: Sharp Carousel Microwave has no power
I too believe that a "protection fuse" was possibly blown. It would need to be found and get replaced. Hopefully it is just a fuse and nothing else because the way it sounds to me, the microwave may be damaged.
Good Luck!
SOURCE: why did my sharp microwave lose all power
remove cover and check small fuse, if fuse is bad it ussually is caused by a failed door switch, hope this helps
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