5 Jun
2006
5 Jun
'06
7:12 p.m.
Roger Merchberger wrote:
Often, oxidation and corrosion (on a microscopic level)
are the culprit. I've many older components with
"tarnished" pins (legs). Even *soldering* to them is
a chore unless you remove the cruft.
Rumor has it that Jim Beacon may have mentioned these
words:
That also is problematic if the devices are located too close
together.
*But*, you can buy individual *pins* and solder them as well.
E.g., consider how Augat panels are built...
I'll also cite early double sided
boards, before through-hole plating - it is virtually impossible to
solder
both sides of a socket.
Virtually impossible? I doubt that - however, there's a few caveats...
Why not get wire-wrap sockets that have longer tails, and put a
toothpick or popsicle stick under the socket when you solder it (with
enough room to remove it later), then it will give enough room to solder
the top as well, thereby bridging both layers. Sure, it's a little more
labor, but can & does work... Granted, if you were working in a very
limited height scenario, one might need to be careful with the extra
height. Oh, and
anything you want to be reliable......
Remember all those "I reseated the chips in their sockets and it worked"
posts you've seen on this list!
Use machine-turned or machine-pin sockets. Don't blame the socket for
all the companies (CouATARIgh ;-) that used cheap sockets... Besides,
cheap sockets are still better than no sockets when you need to repair
or replace a ROM type chip (CouTANDYgh ;-) but I won't mention any
names. ;^>
Anyway, reseating chips isn't that difficult of a "fix" anyway...