HP Latex 3000 Printer - Manual (Page 276)

◦ If the printhead alignment was done with a different substrate of different thickness, probably a
new printhead alignment is needed.
◦ Fine-tune the alignment by identifiying the offenders in the printhead alignment diagnostics plot.
See
Alignment procedure on page 119 .
● Substrate advance. Before trying to adjust any parameter, make the following checks:
◦ Check that no substrate-advance factor was set earlier that could prevent the substrate-advance
sensor from working correctly.
◦ Run the diagnostics to check that that the substrate-advance filter is not dirty.
If the substrate advance is not well adjusted, particularly if it is over-advancing, a white line can appear
between passes.
A clear symptom of this is when the white 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 129 .
You can usually correct this problem by adjusting the substrate advance compensation (see Substrate-
advance compensation on page 128 ). 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 202 .
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.
Bands of light and dark zones
These are periodic horizontal bands formed of a lighter band and a consecutive darker band. This pattern is
mostly seen in solid color area fills (such as light purple or gray).
270 Chapter 10 Troubleshoot print-quality issues ENWW