Two dead LK201 keyboards

Paul Anderson useddec at
Fri Dec 27 18:43:48 CST 2019

Do you have a known good cable you can swap out?

On Fri, Dec 27, 2019 at 9:56 AM Paul Koning via cctalk <
cctalk at> wrote:

> Gentlepeople,
> I'm doing some work with my Pro 380 over the holidays, but have run into a
> snag because both my LK201 keyboards are dead.  They fail poweron self test
> -- LEDs stay on and no response to any keypresses.
> The odd thing is that the circuit board itself seems ok; I had a spare
> board that tests fine by itself, so I installed it as a replacement control
> board on one of those keyboards and now it fails.  So that suggests there's
> something wrong with the key array that breaks selftest.
> I don't understand that because the documentation says a stuck key would
> produce a selftest pass along with an indication reporting stuck key.  And
> while I know LK201 keyboards don't like spilled liquids, one of those
> keyboards definitely hasn't been abused that way and I don't see signs the
> other one has, either.  So having both fail the same way is puzzling.
> Any ideas?
> I'm considering building a PC keyboard LK201 emulation, should be a fairly
> simple bit of Arduino code.
>         paul

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