VT220 Keyboard Error 4?
ard at p850ug1.demon.co.uk
Wed Oct 1 16:41:38 CDT 2008
> It may be possible to dismantle those switches, but it looks hard. It
> may be worse than that...
Dismantling one is easy -- I've mentioned how to remove the PCB and he
kyecaps. After that you ahve to cut wasy all the heatstakes, at which
point the key housings nad leaf springs fall off and you can sepaerate
the memberane layers.
Ressambling one is hard. Very hard. So hard that I never managed to do it.
The problem is that there's not enough length left in the heatstake pins
to form them over again. The walls of the key housings are not thick
enough to drill them out and assemble them with screws. DEC never supplied
spares for the keybaord switch assembly (even when the LK201 was a current
product) so you couldn't get new hosuings with long heatstake posts and
use those. And the fdxing has to be firm enoguh to reset the forces from
the leaf springs.
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