[Coco] Coco3 Keyboard

[Robert Emery]

Well, I kind of doubt Tandy used silver traces on the keyboards...
at any rate, the intermittent nature of it was annoying as hell.
 
cheers,
Bob

----- Original Message ----
From: jdaggett at gate.net
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Tuesday, August 15, 2006 9:24:59 PM
Subject: Re: [Coco] Coco3 Keyboard


Bob

Silver oxide is conductable. While not as conductive as pure silver, it is the 
only oxide of the transisition metals that is conductive. In RF applications, the 
silver oxide coating is generally left alone unless one is dealing with 
microwave frequencies. Then the prefered metal is gold.

Not so sure Tarnix is a wise choice to clean the contacts. 

james

On 15 Aug 2006 at 15:16, Robert Emery wrote:

> That said, I've noticed on more than one CoCo3 keyboard sections
> of the traces turning from silver to black, apparently due to oxidation.
> This seems to lead to intermittent operation of either a row or column of
> the keyboard grid, getting progressively worse until it quits working
> altogether.
> 
> I've not tried repairing a keyboard in this codition. Perhaps our resident
> chemist, Robert Gault, could shed some light on whether this might be
> reversible... Tarn-X ?



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