Apparently some are using this product: http://fr.farnell.com/kontakt-chemie/graphit-33-200ml/revetement-conducteur-graphite/dp/832959 apparently it also exist a kit to repair the keyboards (similar technique but not a spray) https://www.amazon.com/Keypad-Restore-Conductivity-Carbon-Copper/dp/B0026PRMVM Le 03/11/2017 à 14:44, william degnan a écrit : > Hi...I am working on a PET 2001-32B with a bad keyboard. The circuit > board is OK, the keyboard logic is OK, the computer itself is fine. I > have isolated the problem to the black carbon tips that touch the > circuit board upon a tap of a key from the keyboard. > > I have cleaned the tips with 91% isopropyl alcohol and that has had > little effect. I speculate a glaze has formed on the tips and the > conductivity has been lost. > > Should I clean "harder"? > > I have heard one should paint/brush a metallic paint onto these tips, > but I am thinking there must be a way to restore the conductivity > without adding paint, something that will lead to issues down the > road. I have also seen a page stating the solution is to scribble on > the tips with a pencil. Also not to me a good long-term solution. > > Would it make sense to simply use a pencil *eraser* on the tips > instead, or a very smooth sandpaper/file to buff them in order to > clear off a thin layer/film that may have formed? > > I figure someone here has been through this. I searched the web, > surprised to have not have found more written about this. Up to this > point I have had spare keyboards and this issue never came up. > > Thanks > > Bill Message was sent through the cbm-hackers mailing listReceived on 2017-11-03 14:02:34
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