HP Scitex LX600 HP Scitex LX Printer Family - Maintenance and troubleshooting - Page 14

Troubleshoot printhead alignment, Printhead alignment diagnostic plot, Substrate-advance compensation - service manual

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Troubleshoot printhead alignment Automatic printhead alignment may fail occasionally. In some cases, you may see the front panel error message "Automatic Printhead Alignment is cancelled because of scanning errors". In other cases, there is no error message but the print quality is not satisfactory. Here are some possible explanations. ● There is some problem with substrate advance (see Substrate-advance compensation on page 8). After fixing any substrate-advance issue, retry automatic printhead alignment. ● You are using a highly-textured (some banners), non-white or very reflective (some satinated offset) substrate. Please use manual printhead alignment in these cases. ● The substrate is wrinkled. Check that the substrate is correctly loaded with uniform tension. Try using the diverter rollers to increase the tension. If necessary, try adjusting substrate parameters such as tension or drying and curing temperatures. ● The substrate is not wide enough. Repeat the alignment process using a substrate roll at least 610 mm (24 in) wide. ● The printer window was open during the printhead alignment process. ● The printheads are not clean. See Clean the printheads on page 25. If the problem persists, please try using manual printhead alignment, or call your service representative (see HP Customer Care Centers on page 68). Printhead alignment diagnostic plot The printer offers a printhead alignment diagnostic plot, to assess the quality of the current printhead alignment. To print it, start the HP Internal Print Server and select Printer > Printhead alignment > Diagnostics plot. Printer calibration 1. The colored crosses on the left side of the plot should show the lines well aligned with each other. 2. The vertical lines to left of center should be straight, without kinks. 3. Of the four vertical lines at the top right of the plot, the leftmost two should be straight, without kinks. Substrate-advance compensation Accurate substrate advance is important to print quality because it is part of controlling the proper placement of dots on the substrate. If the substrate is not advanced the proper distance between printhead passes, light or dark bands appear on the print, and there may be an increase in graininess. 8 Chapter 3 Printer calibration ENWW

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Troubleshoot printhead alignment
Automatic printhead alignment may fail occasionally. In some cases, you may see the front panel
error message "Automatic Printhead Alignment is cancelled because of scanning errors". In other
cases, there is no error message but the print quality is not satisfactory. Here are some possible
explanations.
●
There is some problem with substrate advance (see
Substrate-advance compensation
on page
8
). After fixing any substrate-advance issue, retry automatic printhead alignment.
●
You are using a highly-textured (some banners), non-white or very reflective (some satinated
offset) substrate. Please use manual printhead alignment in these cases.
●
The substrate is wrinkled. Check that the substrate is correctly loaded with uniform tension. Try
using the diverter rollers to increase the tension. If necessary, try adjusting substrate parameters
such as tension or drying and curing temperatures.
●
The substrate is not wide enough. Repeat the alignment process using a substrate roll at least
610 mm (24 in) wide.
●
The printer window was open during the printhead alignment process.
●
The printheads are not clean. See
Clean the printheads
on page
25
.
If the problem persists, please try using manual printhead alignment, or call your service
representative (see
HP Customer Care Centers
on page
68
).
Printhead alignment diagnostic plot
The printer offers a printhead alignment diagnostic plot, to assess the quality of the current printhead
alignment. To print it, start the HP Internal Print Server and select
Printer
>
Printhead alignment
>
Diagnostics plot
.
1.
The colored crosses on the left side of the plot should show the lines well aligned with each
other.
2.
The vertical lines to left of center should be straight, without kinks.
3.
Of the four vertical lines at the top right of the plot, the leftmost two should be straight, without
kinks.
Substrate-advance compensation
Accurate substrate advance is important to print quality because it is part of controlling the proper
placement of dots on the substrate. If the substrate is not advanced the proper distance between
printhead passes, light or dark bands appear on the print, and there may be an increase in
graininess.
8
Chapter 3
Printer calibration
ENWW
Printer calibration