Sharp SF-S55N Service Manual page 118

3) Stapler unit rocking motor control
a. Outline
The stapler unit rocking motor is a 4-phase control
stepping motor. The stapler unit rocking motor (M4)
ON/OFF and rotation direction are changed by
controlling the output timing of pulse signals A, A*, B,
B*.
The stapler unit rocking motor can be driven when the
rocking enable signal (SWEBL) is generated.
Sorter controller PWB
Motor
driver
9−48
SF-S55N
Stapler unit rocking
motor