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

5 Troubleshoot print-quality issues
General advice
Use the following approach when you have any print-quality problem:
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To achieve the best performance from your printer, use only genuine HP supplies and accessories,
whose reliability and performance have been thoroughly tested to give trouble-free performance and
best-quality prints. For details of recommended substrates, see the User's guide.
●
Make sure that the substrate type that you select on the front panel, and in your RIP software, is the
same as the substrate type that is loaded in the printer. Make sure that the substrate type has been
calibrated.
CAUTION: If you have the wrong substrate type selected, you could experience poor print quality and
incorrect colors, and perhaps even damage to the printheads.
●
Make sure that you are using appropriate print-quality settings in your RIP software.
●
Make sure that you are using the correct ICC profile for your substrate and print-quality settings.
●
Make sure that your environmental conditions (temperature, humidity) are in the recommended range.
See the User's guide.
●
Make sure that your ink cartridges and printheads have not passed their expiration dates. See
Maintain
the ink cartridges on page 20.
●
Avoid touching the substrate while printing is in progress.
Graininess
●
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).
●
If you are printing with eight or more passes, the substrate advance may need adjustment. See
Adjust
the substrate advance on page 27.
●
If graininess is more visible in dark or saturated colors, there may be a problem of ink coalescence. Try
the following suggestions.
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