HP Designjet L28500 HP Designjet L28500 Printer Series - User's guide - Page 71

Check the quantity of ink on the substrate, Too much ink

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Tips ● 4 to 16 passes should cover most printing needs. ● 2 to 6 passes provide lower print quality. Also, the color gamut will be slightly reduced, as total ink is limited to allow for drying and curing. ● For time-critical applications, 2 to 16 passes using a higher carriage speed (1.5 m/s (60 in/s) versus the standard speed of 1 m/s (40 in/s)) can be selected from the RIP. ◦ The increased carriage speed provides about a 15 to 30% gain in throughput (m²/h). ◦ Minor color shifts may be noticed if you reuse presets obtained with the standard carriage speed. You may wish to create a new preset for the higher carriage speed. ● For high-ink applications, you are recommended to use at least 8 passes, depending on the substrate family. Print modes of 20 and more passes have been included to ensure proper drying and curing in certain cases. ● 1200 dpi print resolution is available in the 18-pass print mode only. Make sure you have a specific media preset for this print mode, because reusing others may not deliver the expected print quality. ● For fast layout proofing on cheap substrates, a low-ink 2-pass print mode has been enabled on paper-based substrates. This mode is not intended for use with higher-quality substrate families, as drying and curing will not work properly. This is not designed to be a production print mode, but for occasional usage, as prolonged 2-pass printing may harm your printheads. Check the quantity of ink on the substrate Check that the ink quantities in your media preset are adequate. Look at the color patches in the HP diagnostic chart and check that the patches have the correct amount of ink using the guidelines below: 1. Too much ink: There are several possible symptoms of this problem. ● The last two or three scales of the chart look the same. ENWW Add a new substrate 65

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Tips
●
4 to 16 passes should cover most printing needs.
●
2 to 6 passes provide lower print quality. Also, the color gamut will be slightly reduced, as total
ink is limited to allow for drying and curing.
●
For time-critical applications, 2 to 16 passes using a higher carriage speed (1.5 m/s (60 in/s)
versus the standard speed of 1 m/s (40 in/s)) can be selected from the RIP.
◦
The increased carriage speed provides about a 15 to 30% gain in throughput (m²/h).
◦
Minor color shifts may be noticed if you reuse presets obtained with the standard carriage
speed. You may wish to create a new preset for the higher carriage speed.
●
For high-ink applications, you are recommended to use at least 8 passes, depending on the
substrate family. Print modes of 20 and more passes have been included to ensure proper drying
and curing in certain cases.
●
1200 dpi print resolution is available in the 18-pass print mode only. Make sure you have a
specific media preset for this print mode, because reusing others may not deliver the expected
print quality.
●
For fast layout proofing on cheap substrates, a low-ink 2-pass print mode has been enabled on
paper-based substrates. This mode is not intended for use with higher-quality substrate families, as
drying and curing will not work properly. This is not designed to be a production print mode, but
for occasional usage, as prolonged 2-pass printing may harm your printheads.
Check the quantity of ink on the substrate
Check that the ink quantities in your media preset are adequate. Look at the color patches in the HP
diagnostic chart and check that the patches have the correct amount of ink using the guidelines below:
1.
Too much ink:
There are several possible symptoms of this problem.
●
The last two or three scales of the chart look the same.
ENWW
Add a new substrate
65