Manual Busbar Shifters
The precious metal contact surfaces of the key contacts and busbars are not subject to
corrosion, and the manuals are sealed to exclude dust as far as possible. In spite of these
precautions an occational particle of dust may lodge on a contact and cause the note to be
scratchy, noisy, or silent, and for this reason a busbar shifting mechanism is provided on
each manual to slide the busbars endwise and thus provide a fresh contact surface. The
busbar shifter for each manual is a slotted stud near the right end of the manual as viewed
from the back of the console (see rear view of console,
, for location) .
If any note becomes scratchy or silent, the key should first be struck 15 or 20 times in a
rapid staccato manner to loosen the dirt. This will usually dislodge the particles and clear
the note.
In case this procedure is not effective, the busbar shifter for that manual may be adjusted
by turning the stud about two turns in either direction. It may sometimes be necessary to
hold down the offending key while turning the busbar shifter, in order to wipe the contact
clean.
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