27 Dec
2008
27 Dec
'08
7:56 a.m.
----------------------------------------
Date: Fri, 26 Dec 2008 23:56:48 -0600
From: mbbrutman-cctalk at brutman.com
To:
Subject: Re: Tandy TRS-80 Model 4
dwight elvey wrote:
---snip---
Hi
It must be that they originally had some type of coating. I suspect
the conductive ink is the best option if the pads don't have
built in conductive material.
If R S doesn't carry the ink anymore ( likely ) the auto store
is the next best idea.
Dwight
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Hi
It might be that one could restore it by removing a little of
the surface. One could try a small piece of 220 or finer sandpaper
and just remove a little of the surface that has been oxidized.
Dwight
I had tried abrading the surface a little bit with that thought in mind,
but it did not help at all. I also measured the resistance of the black
disc using the meter probes touching it directly (with a little force),
and the resistance was high as expected. (Somebody had suggested that
the disc was conductive, but after that test I doubt it.)
I think the best idea at the moment is the conductive ink used to fix
circuit board traces. I'm going to give that a shot - there is a trip
to Rat Shack in my near future.