RK05 stuff

From: Ashley Carder <wacarder_at_usit.net>
Date: Sun Jul 18 21:44:29 2004

I reracked these drives into a tall cabinet today so I could
get to the tops and bottoms of both drives. In the process
of moving the drives, I unhooked the cable that connects the
two drives together (drive 0 and drive 1). I decided to
check the drive that did not have a cable connected to it
(drive 1), and it magically works now (in standalone mode).
The drive spins up, the heads move in, no terrible
sounds or anything like that. The READY and ON-CYL lights
light up and all appears to be fine. The other drive that
still has the cables connected to it still didn't spin up.
I then removed the M930C terminator card from drive 1 and
put it in drive zero, removed the card that had the
controller cable attached to it (M993 RK8E cable), and
powered it up. I then tried loading a pack and this drive
works too, spins up, moves the heads and lights the READY
and ON-CYL lights.

Next step is to make sure these drives have the right cards
to be able to hook up to an RK11 controller (the M993 having
RK8E written on it doesn't sound good), install the
RK11 card set in my 11/34 and connect the drives and see
if RSTS/E recognizes it.

I do suppose that I should do some cleaning on these drives
because although the foam hasn't turned to goop yet, I do
see a few small fragments of the foam laying inside the drive
area that I didn't see before.

Ashley


-----Original Message-----
From: cctalk-bounces_at_classiccmp.org
[mailto:cctalk-bounces_at_classiccmp.org]On Behalf Of Tony Duell
Sent: Sunday, July 18, 2004 12:26 AM
To: cctalk_at_classiccmp.org
Subject: Re: RK05 stuff (was RE: cctalk Digest, Vol 10, Issue 74)


>
> 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 Sun Jul 18 2004 - 21:44:29 BST