Print Quality
6-30
HP DesignJet 5000 and 5500 Series Printers Service Manual
2 Presence of marks on the front side of the media.
The following figure shows the typical marks on the front side of
the printout due to aerosol:
So, as you have seen, we can have marks caused by the ink
accumulation on:
The center platen (and overdrive).
The pinch-wheels.
The cutter wheel.
Our recommendation is to clean the printer once per roll.
Cause 2: Static
Static: Background
Over the past few years, HP has been improving image quality by
using smaller and smaller drops of inks. Without this it would have
been impossible to achieve a level of photo quality unmatched by any
other printer in its class. For example, the DesignJet 5X00 fires 12 pl
drops when using dye-based ink and 18 pl drops with the UV inks,
compared to the 24 or 40 pl used in previous DesignJet printers.
However, reducing the size of the drops has made them more
susceptible to:
Airflow and/or
Static charges.
Any of these two effects may force the ink drops to deviate from its
trajectory causing them to position at the wrong place of the media.
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