problem with tilt on cyberlight cl litho

Problem:

Unit resets normal and homes in normal position.
When I tilt the mirror and I reach the lowest point, the mirror will not go up again. It is staying in the lowest position and making some little shakes while trying to go up.

I think this is a steppermotor problem, but I have my doubts because during reset it is working perfect. I can tilt a much as I want, as long as I do not go to the lowest point, once I have reached this point, the problem begins. Could it be driver?

Please advice, so I know what to order :)

stanny
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