Paul Koning 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 wonder what happens if several keys are stuck/shorted? It might also be good to check if the microprocessor (8051?) is running. (I've got at least two or three LK201 keyboards that are all acting erratically :-( I'm not sure I have any good ones left.) > > I'm considering building a PC keyboard LK201 emulation, should be a fairly > simple bit of Arduino code. > Supplies of good non-USB PC keyboards are probably beginning to get harder to find now too... Regards, Peter Coghlan.
