Ricoh B230 Training Program page 141

Filter H: The number of notches read by the sensor when the rotation speed of the transfer belt is
at its highest possible value.
Filter L: The number of notches read by the sensor when the rotation speed of the transfer belt is
at its lowest possible value.
The encoder contains a disk that has 300 notches on its surface. These
notches are read by the sensor. The controller counts the number of notches
that the sensor has read in the unit of time. If the sensor has read an unusually
large number of notches or an unusually small number of notches, the controller
ignores such unusual signals. Therefore, incorrect reading does not affect the
rotation speed.
Speed Control
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