Alesis QS Series Service Manual page 23

fulcrum offset from center to increase the relative momentum of the weight, it is pushed on one
end by the motion of the key. The other end of the counterweight is free to move until it strikes
the felt strip attached to the frame (i.e. the hammer hits the string).
The individual keys are isolated from the frame by a plastic clip. Individual broken keys
are easily replaced by releasing the clip as shown in Figure 14.
Since the counterweight alone is not enough to force the key up again, a spring located
near the key fulcrum is used to push the key back into place.
Alesis QS Series Keyboards Service Manual V1.00
14
11/19/06