Disk drive parts

I will admit that I've not looked at the manuals on Bitsavers, because I have a real printed manual (actually the DRI version, but it's the same drive). That manual has a section on the PSU, I assumed the Diablo one did too. I assume the manual contains a schematic of the drive. If you can't find the pinout of the power connector from that, they you can easily buzz out the connections from the pins on the connector on your drive to the various voltage rails on the drive mainboard. As I said I think there are only 3 connections ot the PSU (with multiple pins for each), ground, +15V, -15V. Probably, but you don't need them. I'd try a 180 Ohm resistor from each signal to +5V and a 390 Ohm from each signal to ground. The pinout of the connector should be in the manual. -tony