HP T2500 manual Vertical light lines at the intersection between CIS modules

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 156. 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 208. If necessary, see also Grain in area fills when scanning plain paper on page 204.

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 156. 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”.

206 Chapter 23 Troubleshooting scan-quality issues ENWW