Dead IMI-drive (was Re: Onyx C8000: good news and bad news as well)

How many wires does this motoe have in total? If quite a few (6 or more), then I would suspect a motor with electronic commutation on one of the drive PCBs, and it's quite common for the windings of those motors to have very low DC resistances (< 1 ohm). If there are only 2 wires, presumably power connections, I would still suspect an electronically commutated motor (you need to keep the speed pretty constant after all). It's possible there's some circuitry inside the motor, and perhaps a trnasistor has gone short-circuit or something. Can you get inside the motor at all without opening the HDA? (I know it's possible to remove the winding assembly from the motor on a Micropolis 1200 in the field, but it does need special tools...) -tony