HP Designjet 4520 HD User Manual

Lines are missing or thinner than expected
1.Check that the line thickness and color settings are correct in your application.
2.Check that you are using appropriate print quality settings. See 
Choose print quality settings
on page 57.
3.If the problem persists, clean the printheads. See 
Recover (clean) the printheads on page 97.
4.If the problem persists, use the Image Diagnostics Print to find out more about it. See 
How do I...
(Image Diagnostics Print topics) on page 117.
Solid bands or lines...

3.Reprint your image with the same settings as before.
4.If the problem persists, replace the printhead that seems to be causing the problem. If you are not
sure which printhead is responsible, use the Image Diagnostics Print to identify it. See 
How do I...
(Image Diagnostics Print topics) on page 117.
Graininess
1.Check that you are using appropriate print quality settings. See Choose print quality settings
on page 57.
2.Use the Image Diagnostics Print to find out more about the problem. See 
How do...

To reduce the smudging:
●Try to print in an environment which is not too humid for the printer. See 
Environmental
specifications on page 210.
●Change pure black objects in your image to a dark color, such as dark brown, so that they will be
printed with colored inks instead of black ink.
●Use HP Heavyweight Coated Paper.
●Increase the drying time (see 
Change the drying time on page 41).
Ink marks on the paper
This problem may occur for several different reasons.
Smears on the front of coated paper
If a...

A defect near the start of a print
There is a type of defect that affects only the start of a print, within 5.5 cm of the leading edge of the
paper. You may see a thin or thick band of inconsistent color:
To avoid this problem:
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
start of the page) will no longer be printed on. See 
Adjust the margins on page 59....

●The borders of colored blocks are wrongly colored.
To correct this kind of problem:
1.Align the printheads. See 
Align the printheads on page 101.
2.Check that you are using appropriate print quality settings. See 
Choose print quality settings
on page 57.
Lines are discontinuous
If your lines are broken in the following way:
1.Check that you are using appropriate print quality settings. See Choose print quality settings
on page 57.
2.You are more likely to get good vertical lines with roll paper than...

4.Perhaps you have adjusted the drying time at the front panel to speed up the printer output. Select
the 
 icon, then  Select drying time , and make sure it is set to  Optimal.
5. Allow the prints time to dry separately; do not cover or stack them.
Lines are slightly warped
The paper itself may be warped. This can happen if it has been used or stored in an extreme
environment. See 
Environmental specifications on page 210.
Color accuracy
There are two basic requirements for color accuracy:
1.Ensure that...

Converting PANTONE colors manually
If you have a non-PostScript printer, or if you are using an application (such as Adobe Photoshop) that
does not send the name of the PANTONE color to the printer, you will not be able to use Automatic
PANTONE Calibration. Instead, if you wish, you can convert each PANTONE color manually to CMYK
values in the application, using tables produced especially for your printer and paper type.
If your application has a facility to convert PANTONE colors to CMYK values...

8.In your application, set the color space of the image to emulate the HP Designjet 1000 Printer
series and the specific paper type that you used in that printer. The data sent to the driver must be
already converted to this emulation color space, which is a CMYK color space. See your
applications online help for information on how to do this. In this way, the 4020 series will emulate
the colors that the 1000 series can produce when printing on that paper type.
9.In the PostScript driver for the HP...

4.Ensure that the Paper Type setting on the front panel corresponds to the paper you have loaded.
5.If you have an HP-GL/2 and HP RTL file produced for an HP Designjet 1000 Printer series and you
want to print it on an HP Designjet 4020 Printer series, proceed as follows using the Embedded
Web Server or the front panel.
●Using the Embedded Web Server: leave the color options set to Default.
●Using the front panel: select the 
 icon, then Default printing options > Color options >
Select RGB input profile...

NOTE:This option only applies to HP-GL/2 and HP RTL prints and it is designed to improve
medium to low density gray area fills.
Visual gray calibration
This calibration will be optimized for the Image Quality options that are selected in the front panel at the
time the calibration is done.
1.It is important to select from the front panel menu the image quality settings you normally use.
Select the 
 icon, then Default Printing Options > Image quality.
●Select print quality: (Best, Normal, Fast).
●Select...