User Guide

Document feeder duplex operation (standard model)
Following is the basic sequence of operation for a document feeder duplex job.
Figure 1-36 Document feeder duplex operation (first paper path; standard model)
Document feeder duplex operation (standard model)
Following is a description of the first pass of a page during a duplex copy job. The front side of the
page is scanned.
1. The ADF paper present sensor activates when paper is loaded into the input tray.
2. The pick motor rotates to lower the pick roller and starts to pick the loaded paper.
3. The ADF pick success sensor activated when leading edge of the paper is driven past the sensor.
The product firmware registers the leading edge of the paper position.
4. The leading edge of the paper is driven into the nip point of the deskew drive roller and the
deskew pinch rollers. A buckle of paper is created by the nip point for pick-skew correction. The
product firmware registers the leading edge of the paper when the deskew sensor activates.
5. The deskew motor rotates the deskew drive roller to pull the paper into the prescan drive roller.
6. The pick motor stops turning and allows both the pick and feed rollers to turn freely while the
paper is being pulled in by the deskew drive roller.
7. The feed motor rotates to drive the paper into the prescan frontside sensor. The firmware registers
the leading edge position of the paper as the sensor prescan frontside sensor is activated.
8. The feed motor continues to rotate and drive the leading edge of the paper through the preset
distance from the prescan frontside sensor to the scan zone. The scanner begins the scanning and
data retrieval process.
9. The prescan frontside sensor deactivates when trailing edge of the paper passes the sensor. The
firmware registers the trailing edge of the paper position.
10. The feed motor continues to rotate and drive the trailing edge of the paper through the preset
distance from the prescan frontside sensor to the scan zone. The scanner ends the scanning and
data retrieval process.
50 Chapter 1 Theory of operation ENWW