HP Latex 2700 User Guide 3 - Page 287
Hue shift., Coalescence., Increase the number of passes.
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- Check that no substrate-advance factor was set earlier that could prevent the substrate-advance sensor from working correctly. - Run the diagnostics to check that the substrate-advance sensor is not dirty. If the substrate advance is not well adjusted, particularly if it is over-advancing, a white line can appear between passes. A clear symptom of this is when the white lines appear across all colors, because the cause is common to all of them. To confirm it, see Substrate-advance verification on page 137. You can usually correct this problem by adjusting the substrate advance compensation (see Substrateadvance compensation on page 134). However, you are recommended to run the OMAS Diagnostic Tests from the maintenance window as soon as the substrate is unloaded, to avoid having the same problem with other substrates. See Clean the substrate-advance sensor on page 174. Bands of light and dark zones These are periodic horizontal bands formed of a lighter band and a consecutive darker band. This pattern is mostly seen in solid color area fills (such as light purple or gray). There are three likely causes: ● Hue shift. Colors may be slightly different when the carriage is moving in one direction, compared with the other direction, as the order in which colors fall on the substrate is reversed. This can be seen as dark versus light bands, usually visible only in a print mode with 4 passes or fewer. Here is a tip for solving this problem: - Increase the number of passes. ● Coalescence. This is due to an excessive amount of ink, and the ink being misplaced as it is deposited on the substrate, generating bands with more ink than other alternate bands. It can also be caused by firing too much ink in a short time. Coalescence is most likely to be seen in areas of high ink density. Here are some tips for solving this problem: - Use lower ink density. - Increase the number of passes. - Change the drying settings. See Edit a substrate preset on page 76. 280 Chapter 14 Troubleshoot print-quality issues