HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 71
Straight white lines in one color
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3. Check that there is no telescoping of the input roll. Print-quality issues 4. Reduce the level of vacuum (via the add a new substrates process) as much as possible. 5. Reduce the ink limit (through the add a new substrates process or in the RIP), this can help to reduce this issue on some substrates. 6. Use the diverter rollers. You are recommended to use both diverters when printing on self-adhesive substrates, and the output diverter (only) when printing on fabrics. 7. Consider changing the printer's configuration. For the LX850 use the roll-to-free-fall configuration as it is least prone to wrinkles.. 8. Increase the vacuum, to make sure that the wrinkles are not forming in the print zone. 9. If using a unidirectional printmode, try print in bidirectional printmode. 10. Make sure that the scan beam height (through the front panel), is set to normal (and not in a custom position). 11. Use a substrate which is less sensitive to ribs marks (slightly more rigid). 12. In case of heavy and narrow rolls (with diameter > 25cm (10")) generating a bow on the spindle (mainly the input), use a roll which is less than 25 cm diameter. Straight white lines in one color If you see light-colored lines on the print, each possibly followed by a drop of ink, this may be caused by a fiber stuck to a printhead. 1. Clean the printheads and check that they are free from fibers. See Check the printheads on page 24. 2. Clean the substrate edge holders. See Clean the substrate edge holders on page 34. 3. Clean the line sensor and aerosol inlets. In some cases, fibers may accumulate around the inlets. See Clean the line sensor and aerosol inlets on page 30. 4. Clean the electrical connections to the printheads. See The front panel recommends replacing or reseating a printhead on page 82. ENWW Straight white lines in one color 65