I recently had a stepper motor driver failure on my Tormach PCNC 1100 Series 2, and went through the process of diagnosing the problem and replacing the hardware.

I searched the forum here and didn't find anything that was clear when it came to diagnosing a failed stepper motor driver. Tormach's manual was very helpful when it came to working through the troubleshooting steps, if only because I didn't completely understand what was in the control box prior to this problem.

Tormach has switched their non-Polyphase stepper motor drivers to Leadshine, so the stepper motor driver isn't quite a direct replacement. Here's video I put together of the problem, the troubleshooting and the repair of the stepper motor driver:

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