23 Dec
2011
23 Dec
'11
1:34 a.m.
On Thu, Dec 22, 2011 at 05:34:48PM -0500, David Riley wrote:
On Dec 22, 2011, at 5:05 PM, Eivind Evensen wrote:
Thanks for tips. I'll report back for the archives if I get it working.
Regards Eivind
I have an Amiga keyboard (pcb says A3000) where
the four
keys 1, q, a and z doesn't work. The rest of the keyboard
functions well.
This happened after a longer period where I didn't use the keyboard.
Does anybody have any ideas of things to check out to try
to get this working again?
Could be one of the outgoing or incoming matrix lines being broken. Try
seeing if you can ohm them out. You should be able to determine which line
is a likely candidate by checking which one goes to those keys (they're all
in a column, so it should be relatively obvious looking at the PCB).
I've not seen the internals of that keyboard, but most keyboards I've seen
have an internal ribbon cable connecting the matrix PCB to a separate
controller PCB; you might do well to try (carefully) reseating that cable, as
long-term exposure to humidity can corrode the contacts, making them more
resistive.