Document Scanning; Document Scanning At Platen - Lexmark X850e Service Manual

7500-XXX

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.
ADF Scan position
Half rate carriage

Document scanning at platen

Shown below is the operational overview of document scanning at the platen.
Exposure lamp
Lens
CCD
Image
sensor
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MFP Service Manual
Platen registration point
Sensor (scanner HP)
Half rate carriage
1st mirror
Scanner drive motor assembly
Full rate carriage
3rd mirror
2nd mirror
Full rate carriage
CCD
Rear
Sensor (scanner HP)