15 Aug
2005
15 Aug
'05
2:31 p.m.
From: "Joe R." <rigdonj at cfl.rr.com>
At 03:51 PM 8/12/05 -0600, you wrote:
Hi
From what I've been told, WD-40 contains both silicon and
petrolium oils. I prefer using silicon grease for this purpose.
Past experiments with petrolium oil and grease showed that the
contact resistance increased on clean contacts while the
silicon grease showed a significant drop in resistance.
I recommend Dow-Cornings, DC-4.
Dwight
On 8/12/05, Brad Parker <brad at
heeltoe.com> wrote:
I've had similar trouble with the HP 1000 boards. I found that if I
clean the edge connectors and them wipe them with a rag slightly dampened
with WD-40 (mostly kerosene, a light oil) that the cards go in and out much
easier and I have a lot less intermitant contacts. I believe the oil
coating also helps reduce oxidation of the contacts.
Joe Is there a list of the various pdp-11 unibus
backplanes anywhere?
I do not know of a master list online.
My 11/44 has a DD11-DF in it which is impossible
to get cards into and
out of. It's like something is physcally wrong with it. Rather than
damage any cards I thought I'd replace it.
It takes a bit of force to get hex cards in a nearly-unused backplane.
I've bent latches trying to get boards in.