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Print Quality
HP Designjet 4000/4020 Printer Series Service Manual
Paper Expansion - Paper Advance (PEPA)
Description of problem
When printing high density area fills on a paper-based media, the media
will expand. As the media expands, it can create "bandings" between each
swath. The "banding" is mainly noticeable when printing high density area
fills while using the Fast print quality setting and with the optimized for
drawings/text setting activated.
Corrective Action
1 If the image has been printed using the Fast print quality setting, then
reprint it using the Normal or Best print quality setting and activate the
optimized for images option.
2
Try using a heavier paper type, such as HP Heavyweight Coated Paper or HP
Productivity Gloss.
3 Check that the environmental conditions (temperature, humidity) are within
the temperature/humidity range as specified for the Printer (refer to the
User’s Guide for further information).
Do NOT perform the Paper Advance Calibration as this will
recenter the actual advance factor BUT won’t prevent the
differential banding due to paper expansion.
As the quantity of ink is
higher in this area, the
paper expands more and
can cause dark banding.
As the quantity of ink is lower in this
area, the paper does not expand more,
and some white banding can appear.
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