17 Jul
2006
17 Jul
'06
10:49 a.m.
and about half the ICs in it are leaving some of their
pins behind
when removed from sockets as they've corroded right through :-(
This is not uncommon, I've seen it frequently on control systems that
have all socketed ICs. It seems to occur most in the sockets that have
one sprung leaf pressing against a flat side like this \| but also in
other types where the socket contacts the pin surface. All these systems
had been in constant use for more than twenty years.
There were cases where we were getting intermittent errors reported and
on pulling the cards we found at least one IC on each board with pins
detatched.
Hard plated pins, such as TI 74xx series seemed to suffer most with tin
plated steel suffering the least.
Lee.