Xerox Paser 7400 Service Manual page 47

4-Hole Type - The punching operation for the first sheet ends when the punch
shaft rotates 180 degrees and the Punch Home Position Sensor activates. The
punching operation for the second sheet ends when the punch shaft rotates 180
degrees in reverse and the Punch Home Position Sensor activates.
Punch Shaft At Rest
Punch Shaft CCW
Punch Shaft CCW
(Home Position)
Rotation By 180
Rotation By 90
(End Of Punching Operation)
(Hole Made)
Punch Shaft CCW
Punch Shaft At Rest
Punch Shaft CCW
Rotation By 180
(Home Position)
Rotation By 90
(End Of Punching Operation)
(Hole Made)
s7400-153
Theory of Operation 2-15