[Coco] Fixing coco2 keyboard traces.

[Brendan Donahe]

I've fixed non-flexible PCBs using a conductive pen, such as this one:

http://www.mcmelectronics.com/product/CAIG-LABORATORIES-CW100P-/200-175

I'm not sure if this would work for the flexible "ribbon" or not, though.

Brendan
 On Jul 21, 2012 10:12 PM, <cralt at comcast.net> wrote:

> I saved a lowly 16K Coco2 non-ECB from a poll barn. It was in ruff shape
> but I cleaned it up and got it working. The keyboard was totally full of
> trash so i spend the morning dissembling it and washing each part off. It
> all went back together good but only has a few keys working. I swapped
> keyboards with another coco and verified it is the keyboard that is the
> issue. The issue seems to be the ribbon that exits the keyboard. If I
> bypass this with jumper clips I can get the keys to work. It seems the
> resistance is higher on the traces on the exposed ribbon section then it is
> on the traces that are in the keyboard. I can also see light through the
> traces on the ribbon section.
>
> I tried coloring over the tops of the traces with a #2 pencil but it didnt
> help. It seems the coco wants to see zero ohms before it registers a
> keystroke. Its only seeing 4-5 ohms through the bad traces.
>
> Is there any way to rebuild the traces or some how attach jumper wires to
> the membrane? I dont think I will be able to solder to them with out
> melting the plastic. Any one have any tricks to fix this?
>
> Thanks
> -chris
>
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