6-20
Print Quality
HP Designjet 4000/4020 Printer Series Service Manual
Dark Light Zone Banding (DLZB)
Description of problem
Shown below is an example of what you might see if you have this problem.
It is often easier to see the issue at a distance of 50cm than at 10cm:
Corrective Action
1 Using the Image Quality Diagnostic Print, check if there is a significant
amount of nozzles out. If there is a significant amount of nozzles out (refer to
image 1 on Page 6-19), then recover the Printheads (Ink Menu/Printheads/
Recover Printheads) and reprint the image.
2 If the problem persists, align the Printheads (Ink Menu/Printheads/Align
Printheads) and reprint the image.
3 If the problem persists, perform the Paper Advance Calibration (Paper
Menu/Paper Advance Calibration).
Only change the paper advance patch if a clear difference in
terms of media advance is seen.
4 If the problem persists, replace the Printhead that is showing misdirected
nozzles.
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