Lexmark X862de - Document Scanning; Document Scanning at Platen

1-34 MFP Service Manual
7500-432, -632, and -832
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Document scanning
The document scanning section of this machine consists of a scanner that reads a single-sheet document
placed on the platen glass and a document feeder that can transport a multiple-sheet document and flip the
sheets for two-sided scanning.
This 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 (full/half rate carriage) of the
scanner unit assembly is fixed.
Document scanning at platen
Shown below is the operational overview of document scanning at the platen.
ADF Scan position
Platen registration point
Full rate carriage
CCD
Sensor (scanner HP)
Half rate carriage
Lens
Exposure lamp
1st mirror
Half rate carriage
3rd mirror
2nd mirror
Rear
Sensor (scanner HP)
Full rate carriage
Scanner drive motor assembly
CCD
Image
sensor