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

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Jul 17 23:26:04 2004

>
> I've tried both of my RK05 drives. They power on fine. Blower
> seems to be fine. I put a pack in, press the run switch. The
> motor never comes on that turns the drive. The same thing
> happens in both drives. Neither drive will start spinning at
> all.
>
> Any ideas on where to start looking?

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
Received on Sat Jul 17 2004 - 23:26:04 BST