There are three likely causes:
●
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 type of mask (large/small).
●
Substrate advance. When the substrate advance is incorrect, some light and dark horizontal bands can
appear from the misplacement of the ink.
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.
ENWW Advanced print-quality troubleshooting 237
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