Dennis Westbrook said:
Help! I've had my A100 just a couple of months and I have noticed that
a few keys above middle C in the upper manual (not always the same
ones) have begun not to respond when first depressed or respond with
only part of the tone. I've tried moving drawbars, etc., to no avail.
After depressing again or holding the key the proper tone sometimes
comes in. Very unnerving! I wasn't aware of this problem until just
recently.
Yes, it is dirty key contacts which are causing your troubles.
The easy fix is just to play the organ. Hit the the hesitant keys
with a rapid series of staccatos --- that usually helps.
If that's not sufficient, the long term fix is to clean the
bus bars (not a job for the non-mechanically inclined.)
See
and
Geoffrey Dairiki