The Tree mill in the student shop at my college broke a while ago, and it looks like it's up to me to fix it. Someone reported that 2/3 of the fuses on the mill blew. I used a voltmeter to check the voltage input and it seems to be fine. I turned off the breaker and checked for a short between any 2 of the 3 phase power inputs (or to ground) and there wasn't one. I replaced the fuses, turned on the power, and pressed the power button, but it didn't turn on. I then held the power button for a second or two and the box started smoking. Does anyone know what's going on here? My only thought is to pull the motor apart to see if something happened to it, but I don't want to do that unless it's absolutely necessary.