11 Sep
2008
11 Sep
'08
7:48 a.m.
On 10 Sep 2008 at 20:52, Josh Dersch wrote:
The aluminum sheet idea is great, except that on this
board there's
really no room to slide it in -- the chips are close enough together
that I can barely get a small flat-blade screwdriver between them to pry
(gently).
You could also try making an extractor that's modeled after forceps--
a short horizontal "L" section on each leg, just long enough to clear
the space between chips. Some of the pins on these old ceramic
packages are very fragile.
And I reseated all the chips the other night (very
carefully). Going
through with a continuity tester on the first couple rows reveals that
about every other chip has at least one pin that's not making good
contact... this is going to be an ordeal :). The sockets themselves are
going to be a problem -- they have gold contacts (I _think_) but the
actual socket doesn't expose any accessible metal surface -- the pins go
through a hole (that's just barely larger than a pin) in the plastic
sheath and beneath that are the contacts. So getting contact cleaner in
there is going to be an interesting problem.
DeoxIT comes in an aerosol form, which should allow for easy
penetration.
The concern here is that with abrasive methods, you're also rubbing
off the gold plating with the corrosion. That could mean some misery
down the road.
None of this may help you if the sockets have degraded to the point
where the contacts have deteriorated and cannot make good contact
even after cleaning. But a chemical cleaner such as DeoxIT is
probably the best way to approach the problem of dirty/corroded
contacts.
Cheers,
Chuck