Why would the Amana AXP22 be kicking fuse?

SOURCE: Went to use microwave and it just went dead.

short circuit in high tension power supply
DUE TO THE VERY HIGH AND DANGEROUS VOLTAGE 4000( V) IT IS NOT WISE TO FIX IT YOUR SELF UNLESS YOU KNOW WHAT YOU ARE DOING

SOURCE: stopped work when open microwave door no power now

I finally was able to fix similar problem. The "primary" door switch (top switch) had a burned contact inside the switch body, as well as burned surrounding plastic. It would no longer "click" and tended to stay in "closed" position. [The switch is a "normally open" design (NO).] When this occurs and the door is opened, the "monitor" switch causes the fuse to blow out. GE wants $50 for this part. However, I was able to find a universal design of microswitch at Fry's Electronics. It had the same rating (15 amp at 250 volts), same body size, both NO and NC terminals, but with a lever arm which I had to remove by opening the case. Cost was $2.47 + tax. (PRICELESS!). So far so good. I also had to buy a set of Torx driver bits for tamperproof screws to be able to remove the oven cover. (The hole in the end of the bit goes over the tamperproof pin of the screw).
I also viewed a YouTube video which was helpful at http://www.youtube.com/watch?v=YsWTCnACqdY

SOURCE: Amana MVH210W keeps blowing fuse

The magnetron is more than likely the problem, or the inverter board if oven is 7 years old or less. If you have a digital meter you can do a rough test on the magnetron, unplug microwave, set meter to ohms, disconnect one wire from magnetron and put the test leads across too points, if reading is .2ohms or less it is good, but if the test shows infinity or open the magnetron is bad, keep in mind it may have a short making the reading misleading.