> On Sat, Mar 31, 2018 at 11:04 AM, Noel Chiappa via cctalk < > [email protected]> wrote: > >> > From: Aaron Jackson >> >> > I have tried three controllers, two r/w modules and two servo >> > controllers. I'm beginning to think the drive is fine and there is a >> > problem with the RLV21 controller. >> >> Err, think you mean RLV12 QBUS controller board, right? >> >> Anyway, you've already tried ("three controllers") swapping that out? >> >> If you have, perhaps there's a problem with a cable and/or the terminator? >> >> >> However, at this point, sub-system swapping is probably not going to be the >> best way to make progress. I think you're going to have to actually debug >> the >> problem; i.e. dive in and work out what's happening wrong, and why, and >> trace >> it back to the origin. >> >> <snip> > > > I remember spending a great deal of time on my RL02 problem until I finally > figured out the problem source was the backplane. I have a UNIBUS system > and I had a miswired DD11C. I took a DD11B and removed the NPG jumper in > slot 2 as an experiment. It caused my RL02 to be functional, exposing the > DD11C as the issue. > > I know that this will not help you directly, but given you have (probably) > one working RL controller of the three I'd test the QBUS itself, power > etc. Perhaps this was already discussed I am just catching up to this > thread. I also assume this RL02 has been proven to work somewhere else > with same cables. If not I'd try that experiment too. > > Bill
Thanks for the tip Bill. I have run out ideas for debugging on the drive - everything looks fine! I have starting turning my eyes towards my RLV12 controller. A friend has recently bought an RLV12, so I can test it with his in the near future. Although, studying the technical description manual, I am not seeing that any communication, other than 4.1MHz clock, is required when loading the heads. I have been assuming that all of this logic is handled by the drive only. Thanks again, Aaron.
