E Tests And Troubleshooting - Image Access WideTEK 48C Operation Manual

E Tests and Troubleshooting
E.1 Troubleshooting Matrix
Fields with a light blue background need the power user access level. All other fields are
available to all users.
Problem
Image is darker than
expected.
Image is brighter than
expected.
Image has vertical stripes or
streaks.
Image shows a color shift
towards red (tint)
Image shows a color shift
towards blue (tint)
Image shows a color shift
towards red (tint)
Manual
Possible cause
The target used for white
balance is much brighter
than the scanning target.
The document is much
brighter than the target
used for white balance.
Improper white balance.
The target used for white
balance is more blue than
the scanning target.
The target used for white
balance is more red than
the scanning target.
The scanner receives
significant amounts of
infrared light (sun or spot
lights) not visible to the
human eye.
Action
Go to the Adjustments function and
modify the Brightness Correction
setting.
Go to the Adjustments function and
modify the Brightness Correction
setting.
Exercise the White Balance
procedure.
Go to the RGB adjustments and lower
the gain on red.
Go to the RGB adjustments and lower
the gain on blue.
Change position, close blinds, dim or
shut off any bright spotlights.
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