CAPACITOR

Remove microwave from oven cabinet. remove cover and check main fuse with ohm meter.
Tried fuse, it does not blow untill cooking starts.
Check capacitor with ohm meter, after properly performing capacitor dischagre procedure.
Order new capacitor, simple installation. another new fuse and all is good and cooking again.

Replace the capacitor and the fuse. Then it works again. Part arrived in an open plastic bag with scratch. It looked like a returned part, but it works fine.

I replaced the large capacitor (.95 uf). Much of the shell (casing) has to be removed and the capacitor is hard to get to. It is housed in a very inconvenient place. Because of the unfamiliarity of how to access the capacitor it took about an hour to get to it. After receiving the new capacitor it only took about half an hour to install it, re-assemble the microwave, and re-install under the cabinet. Of course a new fuse was required.

My Maytag Microwave UMC5100AD was suddenly broken in 1 second when I heated food last time. Then no clock, etc, seem the fuse broken. to fix it, the most difficult part was how to remove it from the wall trim. Finally got it out. Then went HomeDepot to get the same fuse, replaced and used it, burned again. Then I searched online and ppl said the capacitor might be the one. I took it out and measured it, yeah it indeed was a problem since it's not open. Then I order the capacitor from PartSelect about $32. After 3 days I got it and installed it. Done. Sure need to put the Microwave back to wall trim. That's it. Saved about $500 buck if I buy a new one plus labor to install it. Thanks