HP Latex 560 User Guide - Page 123

Most-common print-quality problems, Graininess, Horizontal banding

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● Check that you have the correct settings in your software program. ● Call your service representative. See When you need help on page 39. Most-common print-quality problems Graininess An image is said to be grainy when it contains perceptible grain, giving it a mottled appearance. If you see this kind of problem: ● 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 146). You can check whether it is necessary by using the printhead alignment status plot (see 3. Printhead alignment status plot on page 114). ● Graininess may be attributable to substrate-advance problems. Try fine-tuning the substrate advance; see 4. Substrate-advance check plot on page 116. ● In particular, if you are printing with eight or more passes, the substrate advance may need fine adjustment. See 4. Substrate-advance check plot on page 116. ● Use a higher number of passes: you will probably see less grain with ten or more passes. ● Some vinyl and banner rolls may have a defective coating (perhaps caused by age), which can cause uneven and grainy area fills, especially when printing with too few passes. Try the following solutions: - Go to your substrate library on the front panel or in your RIP. Select your print mode and increase the amount of optimizer in the the advanced settings. See Add a new substrate on page 96. - Clean the optimizer printhead. - Use the wiper roller accessory (see Wiper roller on page 78). If these suggestions do not solve your problem, consider changing to another roll. Horizontal banding Try the following remedies if your printed image suffers from added horizontal lines as shown (the color may vary). ENWW Most-common print-quality problems 117

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●
Check that you have the correct settings in your software program.
●
Call your service representative. See
When you need help
on page
39
.
Most-common print-quality problems
Graininess
An image is said to be grainy when it contains perceptible grain, giving it a mottled appearance.
If you see this kind of problem:
●
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
146
).
You can check whether it is necessary by using the printhead alignment status plot (see
3. Printhead
alignment status plot
on page
114
).
●
Graininess may be attributable to substrate-advance problems. Try fine-tuning the substrate advance; see
4. Substrate-advance check plot
on page
116
.
●
In particular, if you are printing with eight or more passes, the substrate advance may need fine adjustment.
See
4. Substrate-advance check plot
on page
116
.
●
Use a higher number of passes: you will probably see less grain with ten or more passes.
●
Some vinyl and banner rolls may have a defective coating (perhaps caused by age), which can cause
uneven and grainy area fills, especially when printing with too few passes. Try the following solutions:
–
Go to your substrate library on the front panel or in your RIP. Select your print mode and increase the
amount of optimizer in the the advanced settings. See
Add a new substrate
on page
96
.
–
Clean the optimizer printhead.
–
Use the wiper roller accessory (see
Wiper roller
on page
78
).
If these suggestions do not solve your problem, consider changing to another roll.
Horizontal banding
Try the following remedies if your printed image suffers from added horizontal lines as shown (the color may
vary).
ENWW
Most-common print-quality problems
117