You can usually correct this problem by adjusting the substrate advance compensation (see Substrate-
advance compensation on page 146). 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 231.
If the problem persists, try adjusting tension and vacuum settings according to the table below, step by
step (a to c), until you nd settings that work.
Thin white lines
These are thin white/light lines across the entire image at regular intervals, more easily seen in solid area
lls.
There are three likely causes:
●
Nozzle clogging. A printhead nozzle can be sealed temporarily, by some bers or dirt in the ink bore.
Then not all the ink is red and a lighter horizontal band appears. Sometimes a bigger drop with all the
accumulated ink appears at the end of this light thin line, meaning that the bore is clear then. See
Printhead health troubleshooting on page 336.
●
Printhead alignment. This is a clear contributor to banding. If printheads are not correctly aligned, the
misplaced dots could correlate directly with the severity of the banding, by leaving lighter bands where
the ink should have been placed.
To check printhead alignment, print the printhead alignment diagnostics plot (see Printhead alignment
diagnostics plot on page 140). As a general rule, the biggest contributors to thin-white-line banding
caused by printhead alignment are (in this order):
318 Chapter 10 Troubleshoot print-quality issues ENWW
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