Seeking Motorola S38FC012PIO2 ($$$ Bounty! $$$)

[Pete Turnbull]

On Mar 14 2005, 13:37, Dwight K. Elvey wrote:
> >From: "Pete Turnbull" <pete at dunnington.u-net.com>

> >I still wouldn't use silicon grease, because it creeps over time,
and
> >can cause all sorts of problems, often at some distance from where
it
> >was originally put.

>  Yes, it does creep. I just wonder what problems you refer to.

Bad contacts in sockets, accumulation of dust and airborne detritus,
and problems resoldering or modifying boards when they get older.  It's
the lighter silicones that cause the problems, though, and if you
can find a modern grease that has a smaller spread of molecular
weights, the problem will be greatly reduced.  The difficulty is in
getting rid of the silicones, as they don't wash off, and flow into
holes especially when you heat them up.

I used to do a lot of commercial repairs, especially on 1980s micros,
and I used to hate the ones where people had put gobs of heatsink
compund on socketed chips.  The compound contains lots of light
silicones, which used to get into the sockets and cause bad
connections, and then it was a pain to remove the socket and solder in
a new one.  Of course, the worst were the ones drenched in "contact
cleaner" and WD40.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York