Names And Functions Of Components; Flatbed Scanner - Lexmark MX81 Series Service Manual

The operational overview of a document scanning at the platen:
1
The flatbed scanner CCD assembly travels to read the document.
2
The exposure lamp is installed on the flatbed scanner CCD assembly. As the flatbed scanner CCD assembly travels,
the document on the platen glass is scanned and exposed with the exposure lamp.
3
The flatbed scanner CCD image sensor assembly reads the image data.
4
The ADF employs a constant velocity transport system that scans images by feeding the document at a constant
speed over the specified position (scan position) where the carriage of the scanner unit assembly is fixed.

Names and functions of components

•
"Flatbed scanner" on page 786
• "ADF components" on page 788

Flatbed scanner

•
Flatbed Scanner drive motor—A stepping motor that drives the flatbed scanner CCD assembly.
•
Sensor (flatbed scanner home position)—A sensor that detects the home position of the flatbed scanner CCD
assembly.
• Sensor (flatbed media length)—A series of three sensors used to detect the length of the media placed on the
platen.
•
Flatbed Scanner exposure lamp—A LED lamp to which the document is exposed.
•
Flatbed CCD scanner—The assembly that scans the original document.
•
Flatbed Scanner controller PCBA—A card that controls the scanner section.
A document sheet set in the document tray assembly is fed through the ADF feed belt, ADF pick roll, and ADF separation
roller assembly. The document image is scanned at the scan position, and the document sheet is ejected through the
ADF feed-out roller assembly and the ADF exit roller assembly. For a duplex document sheet, the image on side 1 and
the image on side 2 are scanned at the same time in the same pass.
Appendix C: Theory of operation
786
7463