Hello guys. I have a problem with my nortdictrack x7i treadmill. I got burned a part in my MCB. I replaced it, with some transistors. Plugged it into the treadmill, everything worked, incline, fast speed, and then i go to lover speed and hit home button on screen, and treadmill got off and cant turn it on. So I think something got burned again. What could be the problem, that could cause it? thanks

 

First step is to test the power devices controlling the motor.

 

What Does It mean?

 

The devices mounted to the aluminum heat sink!