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Print Quality
HP Designjet 4000/4020 Printer Series Service Manual
VLS in First 3 Meters after a Media Load
Description of problem
In order to ensure that the user can load the media into the Printer with an
acceptable success rate, the Printer allows the media to be loaded with a
certain level of skew. This initial skew gets automatically corrected as the
media is advanced: there is a transition area where the media rotates until
the skew gets corrected and the paper stabilizes. The media rotation in the
transition zone is what actually creates the vertical line straightness problem.
Corrective Action
1 Make sure that the media is loaded as straight as possible. Use the blue line
of the Print Platen to align the edge of the media correctly.
An alternative way of loading media is to align the media
with the end of the overdrive. This way media waste will be
minimized and it will also reduce media load problems.
2 Check that the appropriate print quality settings are being used.
Refer to
Page 6-3 for further information on choosing the correct Print Quality settings
.
3 Roll paper usually gives better vertical lines than a single sheet of the same
type of paper. If sheet paper must be used, then it is recommended to use
the Best print quality setting.
4
Try using a heavier paper type, such as HP Heavyweight Coated Paper or HP
Productivity Gloss.
5 Align the Printheads (Ink Menu/Printheads/Align Printheads).
Bubbles (Only occurs in Cyan, Magenta and Yellow)
Description of problem
The bubbles problem is normally seen as banding (white lines) and the
severity is quite different depending on the amount of nozzles out.
Corrective Action
1 Check that the appropriate print quality settings are being used.
Refer to
Page 6-3 for further information on choosing the correct Print Quality settings
.
2 Recover the Printheads (Ink Menu/Printheads/Recover Printheads).
3 Turn "Printhead Monitoring" to "Intensive" to guarantee consistent quality
while using the Best print quality setting.
4 Replace the faulty Printhead.
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