Ricoh D131 Service Manual page 1358

Corner Stapling
2.5.3 CORNER STAPLING
Staple firing is driven by the stapler motor [A] inside the stapler unit. The stapler hammer [B]
fires the stapler [C].
The cartridge set sensor [D] detects the cartridge at the correct position.
The staple end sensor [E] detects the staple end condition.
B804/B805/D373/D374/D612 52 SM