Blows the 30 amp fuses

You need to replace the blower motor, and maybe the ballast resistor also.

Pull off one of the wires to the fan. If it still blows a fuse the compressor is shorted. If not replace the fan motor.

sounds like to blow the subs. have you checked the fuses.

By uping the fuse rating you are definitely putting your equipment at risk for damage. The 20 amp fuse is doing it's job. what you need to do is find the reason it's blowing. Stop running you newer machine with the 30 amp fuse and look for the high current source. Hopefully you know what the fuse is protecting and start looking there. A fuse blows due to a high current condition. If it's a motor it could be a mechanical binding of some sort. If it's wiring, it could be caused by a loose connection or exposed wire shorting itself to ground. Look for signs of obvious damage first but if you can't figure out what it is you should have it checked out by a profesional before you cause more, damage and expense.

If greasing the u-joints eliminated the noise for 3 days, that would be the first place to suspect. The grease will briefly remove most of the slack in the joint until it is slung out and the needle bearings will once again run dry & wobble. This noise can be anything from a grind to a loud squeal. I hope this helps.

eWave microwave oven KOT 131UW stopped working suddenly. Popped breaker. reset breaker. Microwave is still dead--no lights, no noises at all.

Try checking the battery - make sure it is not under rated - over rated and be sure the starter it's self isn't drawing too much amperage.
the battery may need replacing and for a temp fix - put in a larger fuse - say 50 amp.
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Gary @ Fix Ya

It sounds like the High Voltage diode (1) is shorted but it could be the magnetron (2) or the HV capacitor (3). - 1 side shorted to ground. A dead short will blow the fuse and kill the unit.

If it was the motor that went out then it would not blow at all. The resistor is the culprit that starts killing off speeds. It should be about $25 to $30 at an aftermarket store like autozone or advanced auto parts.

You might want to try better quality fuses, or allow the amp to warm up a bit before you start bumping down the street make old ladies angry.