Kurzweil K250 - Page 68

3.4.5 - Keyboard Sub-Assembly
The keyboard sub-assembly consists of the mechanical key
actions (with wooden piano keys) and the two Scanner boards. The
keyboard interface circuitry is on the
CPU board and is described
under that section.
Each of the 88 keys pivot
on a rail running across the center of
the keybed. When the "head" of the key (the black or white part) is
pressed down, the "tail" (opposite end) rises. All the keys are
weighted so that they normally rest with the tail end down.
When the tail rises, the action pivots upwards. A pin on the
action activates a sensor. Each key has a corresponding sensor
which is stationary with respect to the keybed.
Figure 3.13
Scanner Board
-...~- Key Weight
BraCket
Leaf Switch
Kurzwell 250 Service Manual, Chapter 3
3- 38
Action Rail
Action Hinge
,r .
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