IanC

Thanks for your reply smiffy, im 100% the belts are not slipping. I was wondering if one or both of the stepper motors could be faulty. Seem to be quite pricey so I was hoping to be certain since I dont have a working mac to try swapping the motors.

Thanks for your questions, I have added some answers if that helps any

I have 4 martin mac 600`s which all have to same fault. When moving at slow speed the tilt works fine, but if they are tilting at full speed the stepper motors struggle. All toothed belts are in tact and I have swapped the pan and tilt driver chips over and the problem is still they same. Has anybody else experienced this problem? if so help would be much appreciated