HP DesignJet T830 User guide - Page 155
Line discontinuities
View all HP DesignJet T830 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 155 highlights
Actions 1. Re-scan the original and set the background color and noise removal to Off. If copying, set the content type to IMAGE. 2. If the problem persists, re-scan the original at a lower scanner resolution (300 dpi or lower resolution if scanning, Fast or Normal if copying). It may also help to flatten the original manually as much as possible before scanning it again. NOTE: The problem of wrinkles cannot always be solved, due to the technological limitations of CIS technology. HP offers HD Scanners with CCD technology for higher quality requirements. If the wrinkles remain after the corrective actions explained above, then no further action can be taken to improve the image quality, except to buy a more expensive CCD scanner. Line discontinuities When scanning or copying large originals, you may sometimes find issues such as that shown in the following image, where a straight line (it does not necessarily have to be horizontal) appears with discontinuities or small steps. NOTE: The black arrow indicates the scanning direction. Actions 1. Repeat the scan, making sure that the product is correctly positioned: it is flat on the floor and it does not move. 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 160. You might also want to deactivate the automatic de-skew algorithm as indicated in A copied or scanned image is very skewed on page 164. 3. If there is no skew but 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. Take care not to move the printer during the 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, reprint it as explained in Calibrate the scanner (see Calibrate the scanner on page 111). ENWW Line discontinuities 151