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Substrate advance. If the substrate advance is incorrectly adjusted, particularly if it is under-
advancing, a dark line can appear between passes. When the problem of line roughness or text quality
applies to all colors and appears in the substrate axis direction, it is likely to be related to incorrect
substrate advance. Another clue that could point to substrate advance as a cause is to observe that the
defect is not constant, appearing and disappearing along the print in the substrate axis.
To confirm it, go to the Internal Print Server and select Printer > Advance Calibration to check the
substrate advance. See
Substrate-advance test print on page 107.
To correct the substrate advance, see
Substrate-advance compensation on page 106. In most cases,
this will solve the problem. However, you are recommended to run the OMAS Diagnostic Tests from the
Print Care 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 178.
If the problem persists, try adjusting tension and vacuum settings according to the table below, step by
step (a to c), until you find settings that work.
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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.
244 Chapter 10 Troubleshoot print-quality issues ENWW
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