This article details the specifications as well as the loading limitations of the scanner ADF.

Scanner
Type:  Color/monochrome flatbed scanner with automatic document feeder (ADF)
Technology:  Charge Coupled Device
Light Sources:  1
Maximum Optical Resolution: Up to 600 x 600 dpi
Scanner ADF
Type:  Single pass with C-path
Maximum Resolution: 600 x 600 dpi (black)
Maximum Capacity:  50 sheets of 20 lb. (75 g/m2) bond
Media Thickness:
       Minimum:    .075 mm
       Maximum:  .13 mm
Paper Weight::  
       Minimum:  14 lb. (56 g/m2)
       Maximum:    32 lb. (120 g/m2)
Scan area:
      ADF
           Maximum:  8.5 in. x 14 in. (216 mm x 356 mm)
           Minimum:  5.8 in. x 5 in. (147 mm x 127 mm)
      Flatbed
           Maximum:  8.5 in. x 14 in. (216 mm x 356 mm)
           Maximum Speed (scans per minute): Up to 16 scans per minute
Paper Orientation: 
           Input:  face up, short edge first

Please contact Lexmark Technical Support for additional assistance.  NOTE:  When calling for service, you will need to know your printer model type and serial number.
Please call from near the printer in case the technician asks you to perform a task involving the printer.