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HP Designjet T2500 eMFP - Image-quality troubleshooting guide

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Actions
1. Repeat the scan or copy, setting the content type to Image, reducing the background cleaning to 0 or
turning the original 90 degrees before scanning it again.
2. If the problem persists, clean and calibrate the scanner as indicated in
Scanner maintenance
on page 39. If calibration ended without errors, proceed to analyze again pattern number 9 and
modules A through E of the diagnostic plot.
3. After analyzing pattern 9, if you see some color differences between left and right sides of the bars for
neutral and vivid colors, call HP support and report “small color differences between adjacent CIS
modules”. Otherwise, if you see color differences for vivid colors but not for neutral colors, see
Clipping
in dark or light areas on page 26. If necessary, see also Grain in area fills when scanning plain paper
on page 22.
Vertical light lines at the intersection between CIS modules
This problem can be found when scanning large uniform area fills which are made of some light color. You
sometimes find light vertical bands (around 0.5 cm wide) at the intersection between two CIS modules, as in
this example. Please note the black arrow indicating the scanning direction in this example.
Actions
1. Repeat the scan or copy, setting the content type to Image, reducing the background cleaning to 0 or
turning the original 90 degrees before scanning it again.
2. If the problem persists, clean and calibrate the scanner as indicated in
Scanner maintenance
on page 39. Then proceed to analyze pattern number 2 of the diagnostic plot at the intersections
between CIS modules. The example below shows a good result on the left and a bad result on the right:
the latter has light vertical banding 0.5 cm wide at the intersection between two CIS modules.
If you see the kind of result shown on the right, call HP support and report “vertical light bands in area
fills at the intersection between CIS modules, after calibrating the scanner”.
24 Chapter 3 Troubleshooting scan-quality issues ENWW