Osborne 1 keyboard repair?

On 9/21/20 6:41 AM, Tom Hunter via cctalk wrote: I don't think you've really exposed anything, have you? The membrane is going to be three layers - a bottom layer with traces on the upper side, a spacer layer, then the top layer with traces on the underside; you're looking at the top of the membrane from the "outside". I expect it's all heat-staked together, but it might be possible to dismantle, separate the layers, clean the conductive surfaces and the spacer, then reassemble. My guess is that what happens is either: a) repeated keypresses over time result in some conductive material wearing off and depositing itself on the spacer, eventually bridging the gap and registering as a short/press. b) corrosion of the conductive surfaces results in the same thing. Either way, cleaning would likely fix it - but only if the membrane comes apart; it may well be sealed together at the edges. Alternately you might, I suppose, be able to drill a small hole through the membrane close to the problem area and inject some cleaning solution between the layers that way, but I don't know how successful that would be. cheers Jules