28 Dec
2005
28 Dec
'05
6:30 a.m.
They look like they should be mylar coated or silvered Kapton discs
with a foam backing. The foam is mostly decayed, and there's
virtually no silvering left on any of the discs. They few that do
have only the slightest fragments. I assume this is supposed to be
conductive, because pressing a disc against the PCB pads doesn't
trigger a key, while touching the PCB with my finger does.
Can these be rebuilt, or are replacement switches available?
They are capacitive, not conductive. i.e. you should not short the PCB
pads. They can be rebuilt, either by homemade pads or
, if you can find them, replacement pads. Google for sol20 keyboard.
Jos Dreesen