HP DesignJet 500 - Manual (Page 79)

Media & Ink Introduction Front-Panel Other Index Solutions
Solving
Problems
Image Quality
Problems
Ink Supply
Problems
Media Problems Image Error Other Problems Getting Help
Printer
Options
Problems with the Printhead(s)
Banding caused by problems with the printhead(s) will
be highlighted in the Image Quality Print because the
banding is not in all of the colors, the colored strip that
has banding was caused by the same colored
printhead. The colored stripes are in the same order as
they appear on the printer as if you are facing it, that is,
Light Cyan first and Black last.
For example, the Image Quality Print shown below was
printed with a printer that has a cyan printhead
problem.
Corrective Action
1. Perform the Printhead Recovery Procedure if you
have not already done so.
2. If there is no improvement in print quality, replace
the printhead with a problem.