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:
