HP Designjet L28500 HP Designjet L28500 Printer Series - User's guide - Page 139

Lack of sharpness, Black areas look hazy

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● Use your RIP to add lateral color bars on the side of the plot that is close to the ink supplies. The color bars are designed to exercise all the printhead nozzles, to prevent the problem from occurring. NOTE: Not all RIPs provide this option. ● Add lateral color bars to the image, manually, before printing. In this case, you can either use the standard colors, or decide to include a particular color in which you have noticed the problem. The recommended width of each color bar is 3 mm. Lack of sharpness If text, lines or solid areas are rough or blurred, the printheads may be misaligned. This is likely if you have not aligned the printheads for a long time, or if there has been a substrate jam. Align the printheads if necessary (see Align the printheads on page 88). You can check whether it is necessary by using the printhead status plot (see Use the printhead status plot on page 126). Black areas look hazy If black areas look hazy or not sufficiently black, try these suggestions. ● Increase the number of passes. ● Laminate the print. ● See Color reproduction tricks on page 70. ENWW Lack of sharpness 133

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●
Use your RIP to add lateral color bars on the side of the plot that is close to the ink supplies. The
color bars are designed to exercise all the printhead nozzles, to prevent the problem from
occurring.
NOTE:
Not all RIPs provide this option.
●
Add lateral color bars to the image, manually, before printing. In this case, you can either use the
standard colors, or decide to include a particular color in which you have noticed the problem.
The recommended width of each color bar is 3 mm.
Lack of sharpness
If text, lines or solid areas are rough or blurred, the printheads may be misaligned. This is likely if you
have not aligned the printheads for a long time, or if there has been a substrate jam. Align the
printheads if necessary (see
Align the printheads
on page
88
). You can check whether it is necessary
by using the printhead status plot (see
Use the printhead status plot
on page
126
).
Black areas look hazy
If black areas look hazy or not sufficiently black, try these suggestions.
●
Increase the number of passes.
●
Laminate the print.
●
See
Color reproduction tricks
on page
70
.
ENWW
Lack of sharpness
133