Adf Document Feed Section - Lexmark MX910de Service Manual

ADF document feed section

The sensor (ADF paper empty) detects the document when the leading edge pushes the actuator and unblocks the
sensor. The sensor (ADF paper width) detects the width of the document. A variable resistor is incorporated to the
sensor and the resistance value varies when adjusting the paper guide. The two sensors (ADF paper length 1 and 2)
detect the length of the document. If no document is loaded on the ADF tray, the sensor (ADF paper length 1) is blocked.
If a document is loaded and only the ADF paper length actuator 1 is triggered, the sensor (ADF paper length 1) is
unblocked. If ADF paper length actuators 1 and 2 are triggered, then ADF paper length actuator 2 blocks the sensor
(ADF paper length 1). The sensor (ADF paper length 2) detects that the ADF paper length actuator 1 is triggered. The
results made by the width and length sensors determine the document size.
When a copy job is initiated, the motor (ADF feed) rotates forward to lower the ADF pick roller to the feed position.
The document stopper is unlocked when the swing arm lowers and the document is fed in. When all pages are fed in,
the sensor (ADF paper empty) detects that the ADF tray is empty.
After a document feed is completed, the motor (ADF feed) rotates backward to raise the pick roller to its home position.
The ADF pick roller is fixed at the raised position by a torque limiter of the paper drive section. The document stopper
lowers when the swing arm is raised to the standby position.
# Section
1 ADF document registration section
2 ADF document feed section
3 ADF document exit section
4 ADF document reading section
# Part
1 ADF feed roller
2 ADF separator roller
3 ADF pick roller
4 Sensor (ADF paper empty)
5 Sensor (ADF paper length 2)
6 ADF paper length actuator 1
7 Sensor (ADF paper length 1)
8 Sensor (ADF paper width)
9 ADF paper length actuator 2
Appendix C: Theory of operation
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