Dust Problems; Stitching Problems - Contex XD2490 Service Manual

Dust problems

There are image quality problems that are not related to HW errors, but are instead related to either in-
sufficient cleaning, bad calibration or limitations of the CIS technology.

Stitching problems

Other issues can be that the scanner simply needs to be calibrated, either because the parameter block
has been erased, never been calibrated or that the scanner has been moved around.
Troubleshooting
Strikes that run in scan direction, witch that
come and goes during the scan is like to be dust.
Clean scanner and original. The strikes are often
a darker shade of the color.
Strikes that run in scan direction, that are color
dependent, or a lighter shade of the color, are
often related to the calibration. Dust that was
present in the scanner during calibration, but has
been cleaned away since.
Stitching problem between 2 CIS modules.
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