Sounds like stuck relay contacts. Magnetrons need a high voltage source which is controlled by a micro to relay and then from relay to voltage source. Even the turntable works via a relay.
SOURCE: microwave ovens
The cover is probably the magenetron. That is where the microwaves come from. If the bread was moist, it might have left condensate in the unit which is causing the sparking. Unplug the unit, leave the door open over night. If you can remove that cover, do so. Be sure to carefully replace it before using the unit. Never turn on a microwave with nothing in it.
If you just put the fan blade back on, it will almost certainly fall off again.
The best bet is to slightly rough up the contact area of the shaft with sandpaper and use a little super glue to hold the blade assembly on the shaft, and let it set a few minutes before using it.
I always recommend that you use the hood vent exhaust fan when cooking on the stove top to keep heat, steam, and
grease out of the controls.
There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
At
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.
You can find
helpful exploded view diagrams and order parts by entering your full
model number from the tag on the oven here.
Feel free to contact me directly (and please remind me of your
full model number from the tag on the unit) for more information & help.
We're
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.
William E. Miller, AS-EET
[email protected]
http://www.microwavedisplay.com
SOURCE: microwave starts running on it's own
There is a short in the cntrol board. I have seen problems arise like this from mice, spiders and other insects. Power fluctuations can also trick the control into activating. ERIC
Testimonial: "Thanks Eric. This was very helpful."
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Thank you Jerry. Since I do not see any relays shown in the parts manual, would the relay be a part of the PCB Assembly P/N 8169526?
Yes, If you could send me picture of the PCB I would point out the relay to you
Jerry, I did not realize you added a comment. It is interesting but the microwave seemed to have fixed itself. It no longer runs on it's own. We had just let it stand for a while unplugged, and when I plugged it back in, it was as if nothing had happened. In the end, I just replaced the microwave. I will be taking the unit apart and will report back if I find anything unusual. Thank you for your help. Alex
Jerry, You are correct. When I took apart the microwave, the tall relay had a wire that looked like it turned brown. When I took apart the relay, the contacts were heavily blackened, so they were obviously arching. Thank you.
i have a kitchen aid ykhms147h and i was wondering if any of you have information the low voltage transformer?
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