Changes

Broken wires are most often causing problems occuring on single-foil keyboards (as found in CPC 664, and 2nd generation CPC 464 keyboards). There is no chance to repair broken wires on the membrane by soldering (either the wire vaporizes, or the foil melts). However, one can '''repaint''' broken wires using conductive silver, which is sold as:

* Spanish/Catalan: ?pasta conductiva de plata o tinta conductiva the silver should be available anywhere were where you can buy electronic components. It may be also available as car equipment (for repairing the rear-window heating).

New membranes are available for other home computers. But none the CPC664 (as of December 2012), but no new ones are sold currently available for other CPCs. Old stocks of replacement membranes are however, still available for the CPC464+ and CPC6128+..?

Cut all wires on the circuit board, and rewire them as in the CPCs keyboard matrix. Sounds simple, but it's quite a lot of work. Of course it works only with keyboards that do have a real circuit board (eg. many inexpensive noname keyboards use boards), not with membrane based keyboards (eg. some of the infamous overpriced Cherry Both expensive and inexpensive keyboards)may contain either type.