231
Print Quality
4. Error reference
The plot contains a reference marked ‘Legend’, this is a guide to deciding if any of the printhead
registrations are correct or incorrect.
• The correct/incorrect criteria shown here corresponds to a plot with a maximum IQ (usually printed
on high quality substrate such as vinyl). Other substrates and usage may accept significantly worse
registrations while stilling producing an acceptable level of image quality.
• Automatic printhead alignment may not produce optimal registration under certain conditions.
Substrate texturing, elasticity and the behavior of the substrate under different temperatures may lead
to some imperfections with regards to printhead registration. In these circumstances the user may
choose to use the Manual Printhead Alignment instead.
5. Scan Axis Angular Check
The small arrow point to the place where the lines printed in subsequent passes meet using unidirectional
printmode. The registration must be checked at that point. The check should be done for the MLm, KY and
CLc printheads. Note that the substrate advances between the upper and lower parts of the plot.
This test mainly relies on the changing surface of the substrate. Problems in the angular alignment lead to
pen to pen misregistration. This is because of the staggered orientation of the printheads.
The angular alignment can differ slightly when the type of substrate varies, or when the substrate has
recently been loaded.
Corrective Action
1. Perform a Printhead Alignment. Use the same type of paper that the customer was using when there
were image quality printing issues. However it should be noted that some paper types are not suit-
able for the Printhead Alignment.
2.4.1 Printheads Health Test Plot
To print this test plot go to Menu List>2. Image Quality Plots>2.4 Printheads Health>2.4.1 Print Test Plot.
The printhead health test plot is designed to enable you to see the overall health of the printhead nozzles.
The nozzles check (bottom of the plot) is printed in a one-pass full swath mode. The diagnostics test prints
out every single nozzle of each Printhead without applying an error hiding or alignment algorithm.
To Next Page
Loading...