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Old 06-07-2007, 02:03 AM
Grant Stockly Grant Stockly is offline
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Join Date: Jan 2005
Posts: 447
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From: "Steve"
Date: Sun, 03 Jun 2007 05:32:29 -0000
Subject: [Altair Computer Club] Re: 88-PPG Troubleshooting

Jack,

I don't know whether the "silver" pins are real silver or tin-lead,
but for the chips I experimented with, DeOxit didn't have much effect.

steve
=========================

--- In altaircomputerclub@yahoogroups.com, "jack99rubin"
<jack.rubin@...> wrote:
>
> > Usually, working the pins in and out of the socket several times
will
> > scrape through the insulating coating. ZIF sockets are a
different
> > matter, since they don't usually scrape the pins at all during
> > insertion. A trick I use with ZIFs is to partially squeeze the
> > chip's pins by partially closing the clamping lever. This grips
the
> > chip, but loosely enough that I can still slide the chip left and
> > right in the socket a few times, causing the pins to be scraped
off
> > for better contact. I ALWAYS do this when I blast old EPROMs,
even
> > if they look OK.
> >
> > It's tough to solder to such pins, too.
> >
> > Some day, I'll buy a bottle of Tarn-X tarnish remover and give it
a
> > try.
> >
>
> Be careful with Tarn-X since it apparently actually removes a bit
of
> silver in the polishing process. Whether or not you use Tarn-X, be
sure
> to follow up with Caig Labs ProGold. I prefer Caig DeOxit, followed
by
> the ProGold. They breakdown oxide, provide lubrication and maintain
> conductivity. Same treatment for switches too.
>
> Jack
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