I'm converting a treadmill motor to run my lathe it worked great on the bench,but after mounting it to the lathe it just trips the breaker as soon as i plug it in. I don't see anything burnt on my mc-60. after alot of research i'm at a loss. my board has a component that i don't see on any other boards and wondered if it was my issue any input of somewhere to start testing would be greatly appreciated.

 

Btw it trips the breaker even with nothing connected to the board,

 

Check Q2,Q3,D1 for short .
Max.

 

Thanks Max Q3 is shorting out. I'm assuming you test from the 2 outside terminals. I'm also assuming that since that one is shorting it's the culprit. Is there a way to bypass that or do I need to replace it?

 

You have no choice but to replace it, it is best to test out of circuit, you should be able to get a replacement easily from DigiKey etc.
You could power up out of circuit and check there is no other shorts.
Max.

 

There is a schematic on a few threads here, one:
http://forum.allaboutcircuits.com/threads/mc-60-from-treadmill-broken-resistors.103324/
Max.

 

Thanks, I looked at alot of threads on here and looked at a few hand drawn schematics but really didn't know what I was looking at... Lol. The one you linked was a bit closer to my level, I'm ordering that from digikey