HP T2500 manual Small color differences between adjacent CIS modules

4.If the problem persists, clean and calibrate the scanner as indicated in Scanner maintenance on page 156. Check that the maintenance sheet is also clean, and that it is not damaged before calibrating the scanner (an old or damaged maintenance sheet may cause this problem); if it is damaged, call HP support and ask for a new maintenance sheet.

5.If the problem persists, proceed to analyze areas 11 and 12 of the diagnostic plot across modules A to E. In the three examples below, the top example is ideal, the middle example can be regarded as acceptable; but, if you see something similar to the bottom example (or worse), call HP support and report “grain in area fills”.

Small color differences between adjacent CIS modules

When scanning wide plots, sometimes slightly different colors can be seen at both sides of the junction between two CIS modules. This issue, if present, can be easily seen by analyzing patterns 9 of the diagnostic plot at the intersection between CIS modules. Here are some examples. Please note the black arrow indicating the scanning direction in these examples.

Sometimes the color mismatch between adjacent modules can be enormous, showing a serious scanner malfunction, as in the following example. If this occurs, see Completely wrong colors on page 216.

ENWW Small color differences between adjacent CIS modules 205