HP 1055CMHP - Manual (Page 165)

Print Quality
6-17 HP DesignJets 1050C and 1055CM Printers Service Manual
Problems with Horizontal Lines (Banding)
Description of problem
When you look at the image you have printed there are light or dark
lines on the image, these are particularly highlighted in high density
ink areas. This problem is known as banding.
IMPORTANT Banding can occur to a certain degree in draft and normal mode
when printing high density prints. To obtain the best image
always print in Best Mode.
Shown below is an example of what you might see if you have
problems with banding.
How to solve the problem
NOTE While performing the next procedure, duplicate the condition
the printer was in when you discovered the problem: use the
same media and the same print mode.
1 Ensure that the paper you have selected in the front panel is the
same paper that you have loaded.
2 Perform the Printhead Alignment Calibration.
3 Reprint your image.
4 If you have printed your image in Normal or Draft mode and it is
not acceptable to you, re-print it in Best mode. Check the front panel
and driver selection to make sure that Best mode is selected.
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