HP Latex 1500 User guide - Page 408
Graininess, Printhead-to-ribs spacing., Vacuum.
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● Printhead-to-ribs spacing. Check the printhead-to-ribs spacing in the Internal Print Server. If it is higher than normal, try reducing it. ● Vacuum. In some thin substrates, if the vacuum is too high, the substrate follows the shape of the platen ribs, modifying the printhead-to-substrate spacing and causing vertical line roughness. In this case, as the substrate advances, vertical lines get wider after each pass, while horizontal lines are not affected. To correct this problem, try adjusting tension and vacuum settings according to the table below, step by step (a to c), until you find settings that work. Graininess The print shows a higher level of grain than expected, either throughout the print or in some specific areas. The example below shows more grain in the lower half than in the upper half. 400 Chapter 13 Troubleshoot print-quality issues ENWW
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