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Print Quality
HP Designjet 4000/4020 Printer Series Service Manual
Defect Near the Top of the Print
There are two types of defects which affect the top of the Print:
îš„ Soft Landing.
îš„ Avioneta.
Soft Landing: Description of problem
There is a type of defect that affects only the top of the print, within 5.5 cm
(2.17 inches) of the leading edge of the paper. You may see a thin or thick
band of inconsistent color. This problem is caused because of the different
grains that each Printhead has.
Shown below is an example of what you might see if you have this problem:
Corrective Action
1 The easiest solution is to select the Extended Margins option in the driver,
the Embedded Web Server or the Front Panel. This means that the area of
the paper affected by the problem (at the top of the page) will no longer be
used. If using the Extended Margins option is not possible, the try the
following:
îš„ Recover the Printheads (Ink Menu/Printheads/Recover Printheads).
îš„ Align the Printheads (Ink Menu/Printheads/Align Printheads).
îš„ Perform the Paper Advance Calibration (Paper Menu/Paper Advance
Calibration).
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
.
Avioneta: Description of problem
The Vacuum suction varies depending on the amount of media covering the
printzone. The Vacuum suction increases as the beginning of the media
advances over the printzone and this causes the Avioneta defect. This defect
mainly affects CAD plots during the first swath and is seen as roughness or
even as double lines.
Corrective Action
1 The easiest solution is to select the Extended Margins option in the driver,
the Embedded Web Server or the Front Panel. This means that the area of
the paper affected by the problem (at the top of the page) will no longer be
used.
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