HP Designjet L25500 Printer series - Manual (Page 47)

Setting Description If too low If too high
Substrate advance
compensation. Your printer was calibrated at the
factory to ensure that it advances
the substrate accurately when
using supported substrates in
normal environmental
conditions. However, you may
find it useful to adjust the
substrate advance when printing
on unsupported substrates or in
unusual but stable
environmental conditions. Dark lines appear when you use
up to six passes. Graininess
appears when you use eight or
more passes. White lines appear when you use
up to six passes. Graininess
appears when you use eight or
more passes.
Input tension Tension is applied to the
substrate from the input spindle.
It needs to be constant over the
full width of the substrate, thus
substrate load is a critical
operation. The substrate skews and may
become increasingly wrinkled in
the printing zone. Also, substrate
advance may be irregular,
resulting in horizontal banding. The substrate may be
permanently deformed or
damaged. Substrate advance
problems may appear in extreme
cases.
Vacuum The vacuum applied to the
substrate at the printing zone
helps to hold the substrate down
on the print platen, keeping the
distance to the printheads
constant. The substrate may lift up off the
platen and touch the printheads.
This can smear the printed
image, cause a substrate jam or
even damage the printheads. For sticky substrates, friction
could be too high and substrate
advance irregular, resulting in
horizontal banding or irregular
grainy patches.
Bidirectional Specifies if printheads prints in
both directions, when moving
from left to right and from right to
left. If Bidirectional is selected the
amount of ink fired per time unit
is larger, and therefore print
quality defects such as
coalescence and banding may
occur, especially at the sides of
the plot. However, printing speed
is high. If Bidirectional is unchecked then
the printing is unidirectional and
the speed is relatively low. Tip :
Select bidirectional and increase
the number of passes if
coalescence of banding at sides
appear rather than printing in
unidirectional
High Ink level Maximum quantity of ink that will
be laid on paper (High ink level
option only available when
number of passes is 10 or more).
The ink quantity is further
reduced by the RIP color profile. If it is not selected, colors may
look washed-out When selected there can be
excess of ink and some
problems related to poor drying
and curing may be present TIP:
Select High ink level for backlit
applications or if you want high
color saturation
Cutter The printer's built-in cutter can
cut the substrate automatically
between each print. Disable the cutter in the following cases:
● You want to increase the speed of printing.
● You want to use the take-up reel.
● You want to cut the substrate manually.
● The leading edge of the substrate tends to curl and cause
substrate jams.
Auto tracking
(OMAS) The substrate-advance sensor
(also known as OMAS) is located
under the print platen; it can track
the substrate advance
automatically. Disable the sensor in the following cases:
● The substrate is porous and allows ink to pass through to the
platen. Clean the sensor after using this substrate.
● You are instructed to do so by the front panel, because the
sensor is dirty or unable to track this particular substrate.
Here are some more advanced settings, which you are not recommended to change, unless you have
problems that you cannot resolve any other way.
ENWW Add a new substrate type 43
Hand
le the su
bstrate