I've got an original 5C indexer (with the 150 oz/in. motor) that I appear to have blown up. I was replacing the sealtite to the motor and got a pinout wrong, and ever since then the unit fails to do anything but blow 3a mains fuses. The motor checks out OK (and if it were the problem one would imagine I'd be blowing the 10a motor fuse) so it must be the drive unit. When I turn it on now it's OK, but whenever it closes the motor actuation relay there's a very loud hum (from load on the transformer, I assume) and then within a few seconds the mains fuse pops.
Does anyone have any experience repairing these units? I'd rather spend some time bungling around on my own than spend $750 at a repair shop or $5,000 for a new unit. It would be OK if it took a week to fix this, we just finished the last major batch of work it needed to do.