A SERVICE OF

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EN LJ 3100/3150 Service mode functions 109
2
To calibrate the document scanner (continued)
11 Examine the calibration graph. A dip in the calibration graph can
indicate an image defect.
Note
Dips at the ends of the calibration graph are normal.
12 Line up the calibration graph with a newly copied page. If the dip in
the calibration graph corresponds to the black or white line, the
contaminant is likely internal, and the contact image sensor
assembly should be replaced.