190 Chapter 6 Print Quality
Print Quality
What to see in the Dye Overlap Alignment.
The area to check is only the bottom junction pattern for all the colors. The clearest band has to be around
the 0 (±3 dots). Every band is equal to 1 dot error.
In order to solve any problem in the alignment, try the following:
• Repeat the printhead alignment. Most recommended papers are glossy papers were pen alignment
accuracy is best. There are some paper types that are not suitable for Printhead Alignment
(transparent, translucent, …)
• If the alignment process shows the message “Printhead alignment may use up to 3m of paper” in the
front panel. it is because the OMAS is not working. It can be normal for a few types of papers that
cannot be controlled by OMAS. How to check if your paper is OMAS or non-OMAS:
See in the Service Menu > Diagnostic print > Others > Visual Media Diagnostic
• If the issue cannot be fixed after repeat the printhead align, the try to clean the Printheads, To clean
the printheads, go to the Front Panel and select the icon, then Image quality maintenance
> Clean printheads.
• If the issue cannot be fixed, then replace the printhead color that is failing in the align check pattern.
• If there is an issue in the ThetaZ and it cannot be fixed, check if the paper is working with OMAS. In
that case, the issue could be a bad functionality of the OMAS subsystem. Go to the advance
troubleshooting and apply the OMAS process.
Plot for escalation only
There are two plots with three parts to every plot. Both plots have the same pattern. The first printed plot
refers to the rear printheads (number 1, 3, 5 & 7), while the second plot refer to the front printheads (2,
4, 6 & 8).
The top area is the Variable frequency nozzle health plot with odd/even nozzles separation. This part
does not need to be looked at, it is only for escalation purposes.
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