Adf Paper Path Sensors - Lexmark CX825 Service Manual

ADF paper path sensors

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# Sensor
1 Sensor (ADF multi‑feed detect)
2 Sensor (ADF pick)
3 Sensor (ADF gap detect)
4 Sensor (ADF media present)
5 Sensor (ADF pick roller position) Detects if the pick roller is at the correct height to pick paper from the tray.
6 Sensor (ADF media exit)
7 Sensor (ADF 2nd scan)
8 Sensor (ADF 1st scan)
9 Sensor (ADF registration)
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7
Function
Detects the air gaps between sheets to detect double feeds.
Detects the paper to ensure proper picking.
Detects the gap between fed pages. If no paper is detected, the next page
is fed to maximize page output.
Detects if paper is in the tray. It also detects punch holes on the paper.
Detects the paper exiting to the bin.
Detects the paper jammed at the 2nd scan roller area.
Detects the paper about to be scanned at the bottom side.
Detects the paper entering the deskew roller.
Appendix C: Theory of operation
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