HP DesignJet T2600 User Guide - Page 128
Small color differences between adjacent CIS modules, discontinuities error after calibration.
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Actions 1. Repeat the scan, preferably using a higher resolution, and this time make sure that the product is correctly positioned (it is flat on the floor and it does not move), and that the printer is not printing while you scan. Turning the original 90 or 180 degrees and scanning it again may also solve the problem. 2. If the problem persists, check that the original to be scanned is not skewed, and that it does not become skewed during the scan. If so, see Incorrect paper advance, skew during scanning, or horizontal wrinkles on page 124. You might also want to deactivate the automatic de-skew algorithm as indicated in Copied or scanned image is very skewed on page 127. 3. If there is no skew but the problem persists, clean and calibrate the scanner as indicated in Scanner maintenance on page 183. Take care not to move the printer during the calibration (the printer should not be printing during scanner calibration), and check that the maintenance sheet is correctly positioned before starting the calibration. Also check that the maintenance sheet is not damaged before calibrating the scanner (an old or damaged maintenance sheet may cause this problem); if it is damaged, call your support representative and ask for a new maintenance sheet. 4. If the problem persists, proceed to analyze the following areas of the diagnostic plot: a. 4 (from module A to E). b. 10, at the intersection between modules. c. 13 in modules A and E, and 14 in modules B, C, and D. If you see any of these defects in the studied areas, call your support representative and report a "line discontinuities" error after calibration. The four vertical thin black lines at the beginning and the end of the diagnostic plot show, approximately, the position of the intersection between CIS modules, where this kind of error usually appears. If the error appears outside these areas, call your support representative and report "line discontinuities within a CIS module". 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. Note the black arrow indicating the scanning direction in these examples. 120 Chapter 8 Scanning and copying ENWW