So.. how do you use this conductive pen?
Now that I look through my toolbox, this is what I used on the membrane:
http://www.bareconductive.com/shop/electric-paint-10ml/. I don't remember what I used the CircuitWriter for, but they're more or less equivalent.
The trace that runs out to the pad is a copper strip with a protective covering (conformal coating) that makes it appear light green. Carefully scrape back the covering on either side of the break to reveal the copper, then draw a line with the pen or paint to connect the copper on either side. You probably don't need to remove too much of the coating. I'd try 1-2mm on either side of the break.
(In the Sun keyboard, the trace was made of exposed carbon or something similar that got washed out by a spilled drink. It was just a matter of painting over the trace, no scraping was necessary.)
Robert
