Ricoh Aficio MP C3001 Service Manual page 1513

Punch Unit
2.12.2 PAPER POSITION DETECTION
The paper position sensor slide motor [A] extends and retracts the paper position slide that
holds the paper position sensor [B].
The paper position sensor detects the position of the paper edge. The detected position of
the paper is used to move the punch unit across to the correct position for punching.
When the paper position slide is retracted, the paper position slide HP sensor [C] detects
when the slider is at home position and stops paper position slide motor.
SM 61 B793