On Aug 28, 8:58*pm, Ignoramus5734
wrote:

Whose servo amp? *Can you tell by location what that chip is connected to?
Check another to get the part number of the burned chip.

That was am AMC 30A8 amplifier, revision T.

The chips on them mostly do not have markings, this one was a small
one in the middle of the motherboard.

I really like the drives, their simplicity, cost and support from
AMC. I do not know if I can guess the cause. But, possibly,
interference again is to blame. I have, since, routed the twisted DC
motor cables away from control stuff.

You mentioned ferrite cores to place on these cables. Would you
suggest any particular Digikey part number?

Thanks

i

Did you follow the suggested wiring scheme?

http://www.a-m-c.com/download/manual...tallManual.pdf

Paul