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

The ink smudges when touched, or looks oily
These symptoms suggest that the curing temperature was too low.
If you see the problem only in the first 200 mm of the print, increase the warm-up curing temperature in
steps of 5° C until the problem disappears. If you cannot solve the problem this way, increase the number of
passes.
If the problem affects the whole print, increase the curing temperature in steps of 5°C until the problem
disappears. If you cannot solve the problem this way, increase the number of passes.
If the oily finish appears minutes or hours after printing, do not store the prints with printed faces touching
each other. Consider using the take-up reel.
The total length of the print is wrong or inconsistent
As the substrate is heated during the drying and curing processes, some substrates will shrink after the
image has been printed. This may be inconvenient if the print has to be framed or if several prints are to be to
be tiled one next to the other.
As a general rule, you can expect the following percentages of shrinkage:
●
Photorealistic: less than 0.4%
●
Paper-Solvent, Paper-Aqueous: less than 0.5%
●
Self-adhesive: less than 1.2%
●
Banner: less than 3% shrinkage (if you disable the substrate-advance sensor, less than 7%)
The framing problem may be solved by printing a sample and adjusting the length of the image in the RIP.
You may reuse this value for all your future prints with the same substrate, although special care must be
taken when using banners, as the shrinkage may vary up to 1% depending on the amount of ink used in the
print.
You can expect the following variations from one print to another:
●
Photorealistic, Paper-Solvent, Paper-Aqueous: less than 0.4%
●
Self-adhesive: less than 0.7%
●
Banner: less than 1%
To solve the tiling problem and improve the repeatability of the printed length, you are recommended to
ensure that the substrate-advance sensor is enabled in the RIP's substrate preset, as this will improve the
stability of the prints over time. You are also recommended to tile together areas with similar amounts of ink.
If this is not possible, print the areas with different amounts of ink as different jobs and modify the length of
the job with less ink in the RIP to match its length with the job with high ink content.
30 Chapter 5 Troubleshoot print-quality issues ENWW