Ricoh Aficio MP C3001 Service Manual page 1516

Punch Unit
2.12.5 PUNCH HOPPER MECHANISM
The punchouts fall from the punch unit into the punch hopper [A].
The punch hopper full sensor [B] does the following:
Signals that the hopper is full when it detects the top of the stack of punchouts that
have collected in the hopper.
Detects when the punch hopper is set properly.
B793 64 SM