• Sensor (ADF closed interlock)—A sensor that detects whether the ADF is raised away from the flatbed scanner.
• Switch (ADF top door interlock)—A sensor that detects whether the ADF top door is open.
• Switch (ADF lower door interlock)—A sensor that detects whether the ADF lower door is open.
• Sensor (ADF pick roller position)—A sensor that detects the position of the pick roller relative to the position of
the ADF lift tray.
• Switch (ADF elevator tray home position)—A sensor that detects the home position of the elevator tray.
• Sensor (ADF media present)—A sensor that detects the presence or absence of a document on the ADF document
tray.
• ADF media present LED—An LED that illuminates when a document is set on the ADF Document Tray.
• Sensor (ADF skew detect)—A sensor that detects whether the original piece of media is skewed as it passes through
the ADF media path.
• Sensor (ADF gap detect)—A sensor that detects the gaps between pieces of original media being fed to properly
set timing sequences.
• Switch (ADF hole detect)—A sensor that detects whether the original piece of media contains punched holes.
• Sensor (ADF pick)—The ADF sensor (ADF pick) is installed immediately downstream from the pick roller to detect
completion of document feed.
• Sensor (ADF 1st scan)—The ADF sensor (ADF 1st scan) is installed just upstream of the scanning surface and is used
to for scanning timing operations.
• Sensor (2nd scan)—The ADF sensor (ADF 1st scan) is installed just down stream of the scanning surface and is used
to for scanning timing operations.
• Sensor (ADF media exit)—The sensor (ADF media exit) is used to detect when scanned media has exited the ADF.
• ADF feed motor assembly—The feed motor assembly is a stepping motor that rotates the transport rollers.
• ADF pick motor—The ADF pick motor is a stepping motor that rotates the ADF pick roller, ADF feed belt and the
ADF separator roller.
• ADF CCD scanner—The assembly that scans the back side of the original document.
• ADF controller PCBA—A card that controls the ADF unit assembly. The ADF controller card assembly is connected
to and controlled by the Scanner controller card assembly.
7463
Appendix C: Theory of operation
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