Toshiba msx keyboard problems

By wilsone73

Expert (103)

wilsone73's picture

26-03-2012, 19:06

Hi all
does anyone know how to fix a few non working keys on the hxs10?
some work with several presses but a couple don't respond at all.

is this an easy fix or am i flogging a dead horse?
thanksSmile

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By jltursan

Prophet (2619)

jltursan's picture

26-03-2012, 23:53

It's easy, they usually suffer of "degradation" of the contact rubber plate the keys have inside. Hard to explain with my poor english; but you need to disassemble the keyboard and desolder the faulty keys, open the key mechanism with a little screwdriver and of course, being careful enough to not break the plastic.
Once opened, clean the metal plate with some contact cleaner and take a look at some kind of "rubber cup" that has a black inner plate. You only need to paint this surface with silver conductive painting. Let it dry, check with a multimeter that it's conductive again and assemble all again.

Good luck!