27 Dec
2019
27 Dec
'19
5:42 p.m.
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