I have a 5R pro spot that a cust brought to me with what he said was a simultaneous failure of pan and tilt. I naturally began to search for driver, pcb issues, but cannot isolate the problem. I part swapped with a good fixture , swapping first driver IC then entire PCB. (PCB 0530 with V1.1 driver)  Problem same. Donar fixture still worked fine after part swap. Pan will not move at all, and tilt "struggles" and will not reach home. Have also check for mechanical issues, belts. magnets, sensors all ok and spindles are tight on step motor shafts. I supposed there could have been a simultaneous failure of step motors, and I could also win the lottery. lol. Any ideas of anything i might be missing?  If not, I swap steppers, but just not believing it, and customer insits unit worked fine, then next gig no pan/tilt.

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