RK05 stuff (was RE: cctalk Digest, Vol 10, Issue 74)

Firslty, put a termionator card (M930) into one of the cable connector slots if the drive is not cabled up anyway with a terminator in the 'out' slot of the last drive. I seem to rememebr that RK05s do odd things if they're not terminated (and you might also want to try it with the drive disconnected from the controller, with just a terminator, in case it's something like the ACLO/DCLO lines on the bus being asserted). Now, the spindle motor is controlled by a relay on top of the PSU. From what you say in another message that relay is never being energised. The next thing to do is to trace the relay coil signal back to the logic and to find out what has to be asserted for the relay to pull in. There's certainly an interlock switch circuit -- 2 switches in series IIRC that detect that there's a pack in and the door is closed. Obviosuly the RUN switch has to be on. And I think there's some kind of power-OK line. Maybe more. Now find out which (if any) of those signals are not being asserted (if all of them are, then trace through the logic itself, of course), and find out why not. Maybe just a switch that's not closing, maybe more. If you need more help, I'll dig out the prints, but it's a little late to do that tonight :-) -tony