they are yamaha keybeds
theres a metal contact sping that when you press
moves down onto a contact
some times they get a little bent and when pressed
they dont make contact
theres also a big return spring that returns the
key to its upright position
these metal contact strips can also snap
off
if this is the case then you have to replace the
contact board
this means desoldering an octave of the contact
boad unscrewing
and removing then you have to solder in the new
contact board
all parts are available from yamaha
as korg will not support you device any longer and
dont stock parts for keyboards after 6 years
hopefully its just the bent contact spring which
needs adjusting back to it original position
you can see this by looking at the other contact
springs
----- Original Message -----From: paxetySent: Saturday, May 12, 2012 1:33 AMSubject: [vintagesynthrepair] Korg X5 keys not workingI have a Korg X5 bought new in 1995 or 6 - after sitting in a closet for a few years, a few of the keys no longer play. I connected it to a computer, and all of the notes trigger through midi, so the problem is probably in the key contacts.
Does anyone know anything about what kind of contacts are in there? Know who made the keyboards? Are they maybe Fatar units with the common double bubble key contacts, or something else?
I can't seem to find a service manual and the owner's manual is no help.
Thanks,
John