HP DesignJet Z6 User Guide - Page 175
Horizontal smears on the front of coated paper, Ink marks on the back of the paper
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Horizontal smears on the front of coated paper If a lot of ink is used on plain or coated paper, the paper absorbs the ink quickly and expands. As the printheads move over the paper, the printheads may come into contact with the paper and smear the printed image. This problem is normally seen only on cut sheets of paper (not on roll paper). Whenever you notice this problem, cancel the printing job immediately. Soaked paper can damage the printheads. Try the following suggestions to avoid this problem: 1. Check that the paper type you have loaded corresponds to the paper type selected in the front panel and in your software. See View information about the paper on page 35. 2. Use a recommended paper type (see Order paper on page 141) and the correct print settings. 3. If using sheet paper, try rotating the sheet 90 degrees. The orientation of the paper fibers may affect performance. 4. Try changing to a thicker paper type, such as HP Heavyweight Coated Paper and HP Super Heavyweight Plus Matte Paper. 5. Select a paper type that is slightly thinner than the paper you have loaded; this will cause the printer to use less ink. Here are some example paper types in ascending order of thickness: Plain Paper, Coated Paper, Heavyweight Coated Paper, Super Heavyweight Plus Matte Paper. 6. Try to increase the margins by relocating the image to the center of the page using your software application. 7. If you have a Z9+ and you are printing on any kind of photographic paper, try loading the paper as Photo Baryte, which increases the distance between the printhead and the paper. Ink marks on the back of the paper Clean the platen with a soft cloth. Clean each rib separately without touching the foam between the ribs. Black ink comes off when you touch the print This problem may be caused by printing with matte black ink on glossy paper. The printer will not use matte black ink if it knows that the paper will not retain it. To be sure of avoiding matte black ink, you can select any paper type from the Photo Paper category. ENWW Black ink comes off when you touch the print 167
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