HP Latex 560 User Guide - Page 128

Uneven appearance in area fill, Ink is oily or smudges when touched, if that fails, try a new roll.

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- Increase the vacuum level in steps of 5 mmH2O. - Reduce the curing temperature. You will probably need to increase the number of passes in order to achieve adequate curing. - Check whether there are fibers on the printheads. If the problem appears only at the sides of the print, because the edges are uneven or the substrate is curled upward at the sides, consider using the edge holders (see Edge holders on page 68). If the problem appears only at the beginning of the print, try the following suggestions. ● Increase the top margin of your print to give more room at the leading edge. Alternatively, or additionally, increase the bottom margin to provide a non-deformed leading edge for the next print. See Change margins on page 19. ● Increase the vacuum level in steps of 5 mmH2O. Do not exceed the following limits: 20 mmH2O for banners, 45 mmH2O for vinyl, and 60 mmH2O for other substrates. If the vacuum level is too high, you may see an increase in graininess due to too much friction between the rear surface of the substrate and the platen while advancing the substrate during printing; you may also see vertical bands matching the contours of the print platen. ● Increase the number of passes. ● Make sure that the substrate is stored in the same room in which the printer is located. NOTE: Several substrates are sensitive to ambient conditions (temperature and humidity): if the ambient conditions are outside the recommended range, this may affect loading and printing. Uneven appearance in area fill Subtle color differences may be seen in high-density area fills on some substrates if they are stored partially covered after printing. In the period immediately after printing, such substrates should be stored either totally covered or totally uncovered. It may be advisable to avoid prolonged face-to-face contact between two prints. This problem tends to disappear if the substrate is left uncovered for some time. Alternatively, especially with vinyls and banners, some individual rolls may have a defective coating; for instance, the coating may have aged. This can cause uneven area fills in light areas. In this case, try using the wiper roller; if that fails, try a new roll. Ink is oily or smudges when touched There are various different circumstances in which these symptoms can be seen. ● When the symptoms can be seen only at the start of the first print after the printer has been idle for some time (especially when the start of the print uses a lot of ink) This may be just a temporary problem: try reprinting, and perhaps slightly reduce the ink limits. It may be worth adjusting the print queue so that the first job is not difficult to cure (uses a lot of ink). ● When the symptoms can be seen only in certain parts of the print that use a lot of ink Increase the curing temperature, decrease the overall ink quantity, increase the number of passes, and/or modify the inter-pass delay offset (in the RIP or front panel) to allow better drying on consecutive passes. ● When the symptoms appear after reducing the number of passes Increase the curing temperature, decrease the overall ink quantity, and/or modify the inter-pass delay offset (in the RIP or front panel) to allow better drying on consecutive passes. ● When the oily finish appears minutes or hours after printing 122 Chapter 5 Troubleshoot print-quality issues ENWW

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–
Increase the vacuum level in steps of 5 mmH
2
O.
–
Reduce the curing temperature. You will probably need to increase the number of passes in order to
achieve adequate curing.
–
Check whether there are fibers on the printheads.
If the problem appears only at the sides of the print, because the edges are uneven or the substrate is curled
upward at the sides, consider using the edge holders (see
Edge holders
on page
68
).
If the problem appears only at the beginning of the print, try the following suggestions.
●
Increase the top margin of your print to give more room at the leading edge. Alternatively, or additionally,
increase the bottom margin to provide a non-deformed leading edge for the next print. See
Change
margins
on page
19
.
●
Increase the vacuum level in steps of 5 mmH
2
O. Do not exceed the following limits: 20 mmH
2
O for banners,
45 mmH
2
O for vinyl, and 60 mmH
2
O for other substrates. If the vacuum level is too high, you may see an
increase in graininess due to too much friction between the rear surface of the substrate and the platen
while advancing the substrate during printing; you may also see vertical bands matching the contours of
the print platen.
●
Increase the number of passes.
●
Make sure that the substrate is stored in the same room in which the printer is located.
NOTE:
Several substrates are sensitive to ambient conditions (temperature and humidity): if the ambient
conditions are outside the recommended range, this may affect loading and printing.
Uneven appearance in area fill
Subtle color differences may be seen in high-density area fills on some substrates if they are stored partially
covered after printing. In the period immediately after printing, such substrates should be stored either totally
covered or totally uncovered. It may be advisable to avoid prolonged face-to-face contact between two prints.
This problem tends to disappear if the substrate is left uncovered for some time.
Alternatively, especially with vinyls and banners, some individual rolls may have a defective coating; for instance,
the coating may have aged. This can cause uneven area fills in light areas. In this case, try using the wiper roller;
if that fails, try a new roll.
Ink is oily or smudges when touched
There are various different circumstances in which these symptoms can be seen.
●
When the symptoms can be seen only at the start of the first print after the printer has been idle for some
time (especially when the start of the print uses a lot of ink)
This may be just a temporary problem: try reprinting, and perhaps slightly reduce the ink limits. It may be
worth adjusting the print queue so that the first job is not difficult to cure (uses a lot of ink).
●
When the symptoms can be seen only in certain parts of the print that use a lot of ink
Increase the curing temperature, decrease the overall ink quantity, increase the number of passes, and/or
modify the inter-pass delay offset (in the RIP or front panel) to allow better drying on consecutive passes.
●
When the symptoms appear after reducing the number of passes
Increase the curing temperature, decrease the overall ink quantity, and/or modify the inter-pass delay
offset (in the RIP or front panel) to allow better drying on consecutive passes.
●
When the oily finish appears minutes or hours after printing
122
Chapter 5
Troubleshoot print-quality issues
ENWW