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Old 06-07-2007, 02:04 AM
Grant Stockly Grant Stockly is offline
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Join Date: Jan 2005
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From: "jack99rubin"
Date: Sun, 03 Jun 2007 12:20:53 -0000
Subject: [Altair Computer Club] Re: 88-PPG Troubleshooting

My experience with the Caig products has been mostly with Heathkit
stuff that wasn't "dark oxidized". It certainly helped with
intermittent contacts and fretting corrosion. It also noticeably
lessens the insertion force on chips.

The nice thing about the Caig stuff is that is inert and has the lab
studies to show it. I don't know about Tarn-X.

There's lot of info on this sort of stuff in the radio and audio
groups. The guys restoring ham and military gear seem to know their
stuff; the audiofools tend to get a bit a carried away...

Jack

--- In altaircomputerclub@yahoogroups.com, "Steve" <alltare@...>
wrote:
>
> 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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