Two dead LK201 keyboards

[Paul Koning]

Yes, but given that the control PCB worked properly by itself, and stopped working when attached to the key array, it doesn't seem to be a cable issue.

	paul

> On Dec 27, 2019, at 7:43 PM, Paul Anderson <useddec at gmail.com> wrote:
> 
> 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 classiccmp.org <mailto:cctalk at classiccmp.org>> 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
>