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bebek
5th February 2012, 12:51
Hi,

What is the best way to refurbish C128 keyboard? Some of the keys does not work, some has to be pressed hard, some will not work when pressed once but when kept pressed it starts to work. PCB cleaned but no major improve.
Surely somebody has done it :) . Please help.

UberFreak
5th February 2012, 19:16
If cleaning the board & pads doesnt help, there are several possible solutions:

1) The quick-and-dirty way: use tin foil glued to the pads

2) Use conductive paint on the pads. I tried this years ago, worked great but after awhile the paint dries up & breaks into little pieces, which cause shorts...
Maybe a different kind of paint would behave better.

3) This is the best solution but I cant seem to find it anymore. Some years back someone gave me special small round conductive stickers which are meant for remote-control pad repair.
These did the best job & work great to this day!
I couldnt find a regular supplier for these & today I cant find them at all :(

protek
6th February 2012, 14:13
Get a cheap pencil and smear the contact pads with that. I managed to get a Spectrum membrane to work with a pencil.

UberFreak
7th February 2012, 17:29
protek, thats an interesting solution!
Does it last?

Chinners
7th February 2012, 17:37
It depends upon where the problem is, but I found Wireglue worked great for the traces on an old Amstrad. It may not be the best for the contact pads though

bebek
7th February 2012, 19:44
Thanks guys, I will try this and I will try Wireglue on my Spectrum keyboard :) :thumbsup: