Altair 8800b received
ard at p850ug1.demon.co.uk
Thu Jun 9 17:53:08 CDT 2005
> Just in case you are unfamiliar it is best to take a pair of vise grips and
> break up the bad S100 connectors. After that you can remove the pins one
Agreed. The backplane is much more valuable than the connectors...
In some cases, though, you can remove individual pins by melting the
solder and pushing them out.. And then put a new pin, taken from a
similar connector, in its place. I've done this on edge connectors,
header plugs, etc. Worth doing if the replacement connectors are hard to get.
> pin at a time. It is very very bad to heat up the Motherboard and by
> removing the plastic and just leaving the 100 metal pins that means you need
> to apply less heat. This even applies if you have a desoldering station.
> Trying to remove multiple pins at once is near impossible, 100 pins is
With a good solder sucker, what matters is not how many pins, but how
tightly they fit in the holes, especially if the holes are
through-plated. If the pins are a tightish fit, you will never get the
solder off to free them, you have to pull them one at a time with the
solder molten. If they're a fairly loose fit (like IC pins on most
boards) you will be able to remove the part intact if you want to.
Incidentally, the best way to clear out the holes once the part is
removed is to heat the pad from one side with your iron, and suck from
the other side with the solder sucker.... I once had to clear out a lot
of holes in a memory board like that -- my hand ached quite a bit
afterwards (It was a Unibus memory board that could take 128K words of
RAM in 4116s, but only 32K words were fitted. I cleaned out the holes for
the missing RAMs and the series termination resistors, fitted turned-pin
sockets and resistors, and plugged in RAMs...)
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