Trackspot motors 'surging' / 'hesitating'

I've got a Trackspot that has a very odd problem, it is affecting every motor in the unit. When you rotate or pan/tilt at slow to medium speeds every motor will hesitate or surge (depending on how you look at it) while moving. This happens about every .5 / .75 seconds.

My initial thought was one of the data busses feeding the 74373 latches was hung therefore unable to step through all the bit resolutions but checking with a scope I find both the data inputs to the latches and the outputs to the motor drivers all functioning.

I've also swapped the uProc and the Eprom with a known working fixture and the problem stayed with the fixture.

5v and 24v supply rails look good, good voltage, no AC ripple.

I give... any ideas? :confused:
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  • 0
    i have a few trackspots with 93,94 boards in them. their are no errors they work great but no one can seem to tell me why they are making a high frequency noise and no its not the error beep all the stepper motors are doing it but their is no issue with it in audio or dmx mode everything works.. to me it sounds like a bad diode or the rectifier .. they only make the noise in blackout mode or just at an idle it is like it has a bad power issue .. if anyone or anybody has had this problem?? could it be the voltage regulator ? its got to be something on the 24 volt rail ? need help please .. and yes they work with all the controllers fine even working with my elation or pc show express .. like i have said the units run and respond great to audio or controller it is just that high frequency noise they have ..
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  • 0
    i have a few trackspots with 93,94 boards in them. their are no errors they work great but no one can seem to tell me why they are making a high frequency noise and no its not the error beep all the stepper motors are doing it but their is no issue with it in audio or dmx mode everything works.. to me it sounds like a bad diode or the rectifier .. they only make the noise in blackout mode or just at an idle it is like it has a bad power issue .. if anyone or anybody has had this problem?? could it be the voltage regulator ? its got to be something on the 24 volt rail ? need help please .. and yes they work with all the controllers fine even working with my elation or pc show express .. like i have said the units run and respond great to audio or controller it is just that high frequency noise they have ..
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