The result of the alignment can be verified with the printhead alignment diagnostics plot. See Printhead
alignment diagnostics plot on page 101.
Advanced print-quality troubleshooting
If the basic print-quality troubleshooting does not solve the problem, here are some further procedures that
you can try.
One of the most important parts of print-quality troubleshooting is to ensure that the printheads are healthy.
See
Printhead health troubleshooting on page 252.
Print-quality artifacts troubleshooting
Horizontal banding
Horizontal banding means that your print suffers from added horizontal lines or bands, in a regular pattern.
They can look different depending on the cause.
Thin dark lines
These are thin dark lines across the entire image with certain frequency, more easily seen in solid area fills.
There are two likely causes:
●
Substrate advance. If the substrate advance is not well adjusted, particularly if it is under-advancing, a
dark line can appear between passes.
A clear symptom of this is when the dark lines appear across all colors, because the cause is common to
all of them. To confirm it, in the Internal Print Server, select Printer > Advance Calibration to check the
substrate advance. See
Substrate-advance test print on page 107.
You can usually correct this problem by adjusting the substrate advance compensation (see
Substrate-
advance compensation on page 106). 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.
●
Printhead alignment. This is a clear contributor to banding. If printheads are not correctly aligned, the
misplaced dots could correlate directly to the severity of the banding, by putting more ink in the same
place and thus creating darker lines.
234 Chapter 10 Troubleshoot print-quality issues ENWW
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