HP DesignJet T730 User guide - Page 158
Small color differences between adjacent scanbars
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Small color differences between adjacent scanbars When scanning wide plots, sometimes slightly different colors can be seen at both sides of the junction between two scanbars. This issue, if present, can be easily seen by analyzing patterns A and G of the diagnostic plot at the intersection between scanbars. Here are some examples. NOTE: The black arrow indicates the scanning direction. 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 162. Actions 1. Restart the scanner and repeat the scan or copy. If the problem persists, repeat the scan or copy, setting the background color removal to Off or turning the original 90 degrees before scanning it again. 2. If the problem persists, clean and calibrate the scanner as indicated in Clean the scanner scanbars on page 109 and Calibrate the scanner on page 111. If calibration ended without errors, try to scan or copy again. 3. If the problem persists, proceed to analyze patterns A and G in the diagnostic plot, 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 ". Otherwise, if you see color differences for vivid colors but not for neutral colors, see Clipping in dark or light areas on page 157. If necessary, see also Grain in area fills when scanning plain paper on page 152. Vertical light lines at the intersection between scanner scanbars 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 scanbars, as in this example. NOTE: The black arrow indicates the scanning direction. 154 Chapter 17 Troubleshooting copy and scan quality issues ENWW