Lexmark MX910de Service Manual page 768

The motor (ADF scan) drives the ADF scan rollers 1, 2, and 3 to transport the document into the document scanning
section. The sensor (ADF scan) detects the document after the leading edge passes through the ADF scan roller 1.
The ADF scan roller 1 pushes the document until the trailing edge passes through it. This action increases the transport
speed and causes an uneven reading of the image. The motor (ADF scan shaft release) releases the ADF scan idle roll
to reduce the transport speed as the ADF scan rollers transport the document to a scanning position.
The scanner lamp moves to the document reading position and scans the document through the ADF duplex scan glass
on the scanner flatbed. The front side of the document is scanned as it passes over the scanner lamp. The ADF scan
roller 2 receives and transports the document through the CIS assembly where the other side of the document is
scanned.
After the scan job, the ADF scan roller 3 transports the document to the ADF exit roller. The ADF exit roller transports
the document into the document exit section.
# Part
5 CIS assembly
6 ADF scan roller 2
7 Sensor (ADF scan)
8 ADF scan roller 1
9 ADF scan idle roll
# Part
1 Document reading position
2 Document home position
3 Document shading position
4 Scanner lamp
5 ADF scan roller 2
6 CIS assembly
7 ADF scan roller 3
Appendix C: Theory of operation
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