18 Mar
2005
18 Mar
'05
1:15 p.m.
I agree with Tom's statements. I had two RK05s that I messed with
standalone for a while and things did not seem to work properly.
When I cabled them up to the RK11D in the PDP-11, everything
was fine and they worked perfectly. I may have had the exact same
problem that you describe when I tried to test things with
standalone drives. Motors didn't run, etc. until the drive was
properly attached to a valid controller (in my case RK11D).
If you really get stuck and need to see what controls
supplying power to the blower, RK05J engineering drawings
are on bitsavers at:
http://www.bitsavers.org/pdf/dec/disc/RK05J_schem_Mar78.pdf
Ashley
-----Original Message-----
From: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org]On Behalf Of Tom Uban
Sent: Friday, March 18, 2005 3:40 PM
To: General Discussion: On-Topic and Off-Topic Posts; General
Discussion: On-Topic and Off-Topic Posts
Subject: Re: RK05 Help
AFAIK, the RK05 will not function without a controller attached. There are
motor control relays which provide power to both the blower and
the spindle
motor and will likely not engage until the power supplies are valid, ACLO
and DCLO are inactive, etc.
--tom
At 03:07 PM 3/18/2005 -0500, George Wiegand wrote:
in the drive
Is there a safety lock switch (perhaps on the
back) that is normally
activated when installed in a rack that is not activated now
while it is on
the bench?
Thanks,
George Wiegand
Vintage Data General Computer Hobbyist
----- Original Message -----
From: "Rick Bensene" <rickb at bensene.com>
To: <cctech at classiccmp.org>
Sent: Friday, March 18, 2005 10:13 AM
Subject: RK05 Help
> Hello,
>
> I have two RK05J drives, both exhibiting the same problem.
> They are *not* currently connected to a system. I have them
on the bench
cleaning
them up and getting them ready to connect to a PDP 8/e system
after
> a long period of storage.
>
> There is the I/O terminator card installed in the proper slot > electronics backplane.
>
> When the drives are powered up, the "power" and "load" lights
are on, and
> the door release is activated so that the
door can be opened
and a disk
pack
> inserted. However, the blower motor that provides the air
circulation for
> the drive never starts up. I've checked
both blower motors
to assure that
> they are not seized, and the both spin very
freely. I traced
the power
> wires from the blower motor to a barrier
strip, where I checked for
> 110V AC power, and there's nothing there. So, somewhere in the
> circuitry, something isn't right. Any ideas?
>
> Thanks,
> Rick Bensene
> The Old Calculator Web Museum
> http://oldcalculatormuseum.com
>
>
>
>
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