HP Designjet L25500 Printer Series - Maintenance and troubleshooting guide (second edition)

Vertical banding
If vertical bands of different colors (and sometimes of different graininess) appear in the first 200 mm of the
print, this is probably caused by the curing process of the previous print, which may have distorted the
substrate. In this case:
1. Set the extra bottom margin to 100 mm.
2. If the problem persists, set the extra bottom margin to 200 mm. This margin will apply only to jobs that
start printing when the printer is idle, and when the cutter is disabled.
3. If the problem persists, decrease the warm-up drying temperature in steps of 5°C.
If vertical banding affects the whole of the print, the drying temperature may be too high.
1. Reduce the drying temperature in steps of 5°C, down to a minimum of 40°C.
2. If the problem disappears but then there is bleeding, coalescence or not enough durability, try using
more passes or less ink.
3. If the problem persists, restore the drying temperature to its original value and select unidirectional
printing in the RIP.
Misaligned colors
If the colors are misaligned in any direction, 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 11). You can check whether it is necessary by using the printhead status
plot (see
Use the printhead status plot on page 22).
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 11). You can check whether it is necessary by using the
printhead status plot (see
Use the printhead status plot on page 22).
Black areas look hazy
If black areas look hazy or not sufficiently black, try these suggestions.
●
Increase the number of passes.
●
Laminate the print.
28 Chapter 5 Troubleshoot print-quality issues ENWW