Today I replaced my blown blue TB6560 board with a new version (red) one. After setting up Mach3, the step motors move fine with good speed and no missing steps, but the holding torque of the motor is weaker and I can turn the motor with hand without much resistance. Before, with the blue board I was not able to do that unless I force it. I am worried because this may pose a problem if the force on table or Z-axis is stronger than the holding force. I am using a X2 mini mill by the way.

Any help would be Greatly appreciated!

Thanks,
-Mike