At 20:04 11/22/98 +0000, Tony Duell wrote:
<RK07 bearings>
>> or two on an RK07 do you still have the old one laying around to get the
>> number from? Would the DEC parts list have the industry std. part number
>
>DEC regard the entire spindle/bearings/housing as being a single unit. No
>manual I've ever seen talks about taking it to bits. The same applies to
>the spindles in CDC drives, BTW.
I got a couple of drives which could be considered parts units and one
definitely did not have noise or vibration on spinup. Maybe I could swipe a
spindle assembly out of it. That's extremely low priority as I don't have
the time now nor a decent workshop set up yet plus the fact I need to get
rid of some of the extra DEC equipment for space reasons.
>> I forgot to mention Tony, I swapped all the boards out using the second
>> RK07 which was said to be part of the working 11/34A system (this is the
>> drive w/lousy spindle bearings). Still had the same problem as we last left
>> it. I put all original boards back to get back to ground zero on this
>> problem.
>
>I really wonder if it could be a controller/cabling problem. I have the
>RK611 prints as well (I think you do, don't you?), so fixing that would
>be possible as well.
Yes, at least I've got an RK611 printset in the pile of documents from the
haul.
>
>But lets see what it's doing first. The complete RK611/RK07 system is
>complex, no sense in saying otherwise. So finding out where the problem
>is (or at least where the system thinks the problem is) is a good first step.
>
>
>> >Do you have a quad-height extender board? You're going to need one...
>>
>> Oh gee thanks for the "ominous" message here Tony! :-) :-) No, I don't
>
>OK, you don't _need_ an extender. You can always solder wires onto useful
>points on the board, stick it in and probe the ends of the wires to sort
>out what's going on. That's how I debug the many machines I have for
>which I don't have the extender boards.
>
>> have an extender board. That definitely would be a good tool to have as I
>> plan to keep the MicroVAX II and MicroPDP-11 machines plus maybe the 11/23
>> in a BA-11 (5.25" box). Anybody out there have a spare extender board they
>> are willing to part with? Hmmm, does Vector Electronics still sell them? I
>> should get a Unibus extender too!
>
>They do turn up from time to time. I got several in a large clearout of
>DEC spares/options a few years back. I also bought a box of Q-bus boards
>at a rally for a few pounds (on top was an 11/73 CPU...) that contained a
>couple of extenders :-)
>
>There are (of course) at least 4 extenders - single, dual, quad, hex. All
>of them are useful...
>
Thanks again Tony, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt_at_netsync.net
Member of Antique Wireless Association
URL:
http://www.ggw.org/freenet/a/awa/
Received on Mon Nov 23 1998 - 08:31:53 GMT