Ricoh D131 Service Manual page 1375

Punch Unit B702 (For B804/B805)
[A]: Punch Movement Motor (M9)
[B]: Punch Movement HP Sensor (S21)
[C]: Punch Drive Motor (M24)
The punch movement motor (M9) [A] extends and retracts the punch unit to position it at the
correct position for punching.
The punch movement HP sensor (S21) [B] detects the position when it retracts, switches off
the punch position movement motor, and stops the punch unit at its home position.
The punch drive motor (M24) [C] fires the punches that punch holes in the paper below.
Punch Selection and Firing
[A]: Punch Drive Motor (M24)
[B]: Punch Encoder Wheel
[C]: Punch Encoder Sensor (S24)
[D]: Punch HP Sensor (S23)
The punch drive motor (M24) [A] turns the small, notched encoder wheel [B] through the gap
in the punch encoder sensor [C] (S24). The sensor output is used to control the punch
timing.
SM 69 B804/B805/D373/D374/D612