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Specify the gain parameters for the beam positioning servo.
The beam positioning control system regulates the vertical position of the write
laser within the light valve. The difference between the output of the beam
position sensor and the target position provides the error signal for the servo.
The target for the beam position comes from the bposn parameter.
The bkp, bki, and bkd parameters specify the proportional, integral, and
derivative gains for the servo.
These parameters affect the performance and stability of the beam positioning
servo. They should never be changed in the field.
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