Lexmark MS911 Service Manual page 643

Bin stack height detection
The bin stack height solenoid lowers the bin stack height actuator to come into contact with the paper on the bin. At
the end of the actuator, the sensor (staple finisher bin level) and sensor (staple finisher bin stack height) are installed
at different heights. The combination of results from the sensors determines the height of the bin.
Bin level full detection
When the sensor (staple finisher elevator home) detects the elevator bracket, the printer determines that the bin is
full.
# Part
1 Motor (staple finisher elevator)
2 Bin stack height solenoid
3 Bin stack height actuator
4 Sensor (staple finisher bin level)
5 Sensor (staple finisher bin stack height)
6 Exit roller solenoid
7 Sensor (staple finisher elevator home)
8 Bin
9 Lower exit roller
# Part
1 Bin stack height actuator
2 Sensor (staple finisher bin level)
3 Sensor (staple finisher bin stack height)
4 Bin stack height solenoid
Appendix C: Theory of operation
643
4021, 7421