Wiring diagram Problem - Maytag MMV5207A 1100 Watts Microwave Oven
If it is the magnetron cooling fan, it should be a one-speed type.
Assuming your AC line power is correct (110-125VAC) then the fan may be bad, or there may be a problem with the relay on the control board or indeed a bad connection in the wiring.
The way I would test it is to disconnect the fan and the connect a line cord directly to it.
I've uploaded the wiring diagram to my site at:
http://207.234.249.73/mwd/mmv5000_wiring.gif
If you think it's the control board, we repair these for $39.95 in most cases.
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.
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