HP DesignJet T830 User guide - Page 156
Light-colored area fills are missing in the scan or copy, Grain in area fills when scanning plain
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4. If the problem persists, proceed to analyze the following areas of the diagnostic plot: ▲ D, H and L (for three modules, 0-Left, 1-Middle, and 2-Right and its intersection) If you see any of these defects in the studied areas, call HP support 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 scanbars, where this kind of error usually appears. If the error appears outside these areas, call HP support and report "line discontinuities within a scanbar". Light-colored area fills are missing in the scan or copy When scanning or copying a map with a light area at the top, the Background color removal setting could interpret it as a background color, therefore removing it and other similar areas. The example below shows the original image on the left and the scanned image on the right. Actions 1. Repeat the scan or copy with Background color removal set to Off, or, in the case of copying, you can select Image as the content type. See Scan settings on page 58 and Copy settings on page 70. 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. Repeat it again with Background color removal set to Off. Grain in area fills when scanning plain paper When making copies of an original containing area fills, if the paper used in the printer is plain paper (for instance, HP Universal Bond or HP Bright White Inkjet Bond), some grain may appear in the image. This error may also appear in scanned files of originals that were printed on textured paper. The example below shows the original image on the left and the scanned, grainy image on the right. 152 Chapter 17 Troubleshooting copy and scan quality issues ENWW