10 Sep
2008
10 Sep
'08
7:11 p.m.
If these are standard wire wrap boards with machine pin sockets - they are sort of self
cleaning on insertion.
with a screwdriver, (lever off adjacent IC) end then other end, walk the ic 3/4 out of the
socket and re-insert it.
10 minutes to do the whole board 25 rows of 13 chips.
I bet that brings you back up.
Pencil eraser on the gold fingers on the card edge too, until they are nice and bright.
Randy
Date: Wed, 10 Sep 2008 14:22:13 -0400
From: rtellason at verizon.net
To: cctalk at classiccmp.org
Subject: Re: Suggestions for cleaning hundreds of socketed chips?
On Tuesday 09 September 2008 04:17, Josh Dersch wrote:
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Hey all --
I've gotten the power supply in one of my ND-812s running (thanks for
the help w/the 1103 data which helped verify the voltages) and it
appears to be within spec under load (correct voltages, no ripple in the
output, etc...) so I powered the machine on and despite having my
fingers crossed, the machine does not run. (No real surprise there).
Random lights on the front panel, and basically no response to any
toggle switches.
I started pulling out and reseating the chips on the main CPU board and
powered it up after every few rows, and every time the behavior was
slightly different, so I'm fairly sure that the sockets and chips aren't
all making good connections anymore. Seems like solving this problem
would be a good place to start.
The problem is that there are 25 rows of 13 chips each (all socketed),
in very close proximity to one another. The chips are in sockets with
wire-wrap pins underneath -- the underside of the main CPU board is a
maze of wire wrapping. Most of the chips have date stamps between 1971
and 1973, but luckily most of them aren't corroded to the point where
they're falling apart.
How would you suggest cleaning the sockets and the chips to ensure good
connections?
Take it outside and blast away at it with compressed air.
Some stuff that I've dealt with has a lot of fairly find dust all over the
innards of it, and even nice gold-plated machined-contact sockets aren't
working right any more because of that stuff -- which came into the equipment
by way of forced air cooling.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin