PDP-11/34 filter and cable routing questions
John A. Dundas III
dundas at caltech.edu
Tue Apr 17 15:16:35 CDT 2007
Henk and Jay,
Thanks for your comments. It's odd that this isn't in any of the
FMPS anywhere (that I have seen). I can't help but think there must
have been some Field Service maintenance procedure (and thus
document) or training document somewhere that addresses this. I
would imagine this was a typical PM checklist item.
OK, so the filter OUTSIDE of the velcro, between the panels and the
box frame, makes sense. You can see on mine that there are 4 velco
strips. I don't see any evidence of a retaining bar, as Jay
mentioned, though that makes sense.
Also in the picture of my as-found filter, there is a hole on the
left that looks to have been cut rather than decayed. I wonder if
some cable routing was done through that? The ribbon cable needs to
attach to the left of the programmer panel, though I'm not sure how
it's supposed to leave the box. The power and display cables route
from the right to the middle of the programmer panel.
I can't use the condition I found this in to determine if the filter
was half height (Henk's case) or full height (Jay's).
I agree that the filter doesn't seem to actually do much. Especially
in my case where I don't have a top to close the box anyway. I'm
just seeing how close I can get to factory-fresh conditions.
Thanks for all the comments.
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