Hello. i have a sharp carousel microwave i bought one year ago and now it is making a louder noise when it's cooking plus the outside of the microwave unit is getting very hot. what do you think is the problem and what to do about it? thanks, nina.

There are door switches and one of them is evidently out of adjustment or the little actuator arm on it is.

We would need to know the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc.

Please post a new help request with that and more detailed symptoms, such as when it occurs.

When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Sounds like the inverter (power supply for cooking) or the magnatron which does the work----neither are cheap parts.

29 15/16" W X 16 3/8" H X15 1/4" D (outside dimensions)
I copied this from my Sharp Carousel Operation Manual as I just
had to replace my 13 year old microwave.

It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps

This is the thermistor is time to replace

There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.

Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.

Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.

Hope this has helped a little. Thanks for using Fixya!

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron.

Since it's less than a year old, it's fully under warranty and Sharp will fix it free.

You can contact Sharp at 1-800-BE-SHARP (1-800-237-4277) or visit them online to get it fixed.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

If you have no power what so ever its probably the main fuse inside the mirowave. You'll have to take it apart. If you try this yourself unplug it then there are several screws around the cabinet of microwave remove them and make sure that they go back where you took them out from because they may or maynot be the same size or length. once you get the cabint off follow the plug wire up into the micro wave there may or may not be a fuse on the wire just inside the frame of the Microwave but it will be close when you find it take it out and replace with the exact size take it to a appliance parts store and get the replacement.

It can be oiled with something akin to Pam (cooking oil spray). You don't want petroleum products in your oven -- it'd take forever to get the fumes out.

I'd try first just spraying some under the turntable as far back toward the center as you can get it -- run oven -- spray some more, etc., etc.

Charlie