HP Designjet L25500 Printer series - Manual (Page 80)

The International Color Consortium, a group of companies that have agreed on a common standard for color
profiles.
Ink density
The relative amount of ink that is deposited on the substrate per unit of area.
IP address
A unique identifier that identifies a particular node on a TCP/IP network. It consists of four integers separated by
dots.
LED
Light-Emitting Diode: a semiconductor device that emits light when electrically stimulated.
Minimum drying power
The minimum heat applied in the printing zone so that the substrate does not cool too much in lightly-inked areas.
Low minimum power may cause print quality defects; high minimum power may damage the substrate, especially
with a high number of passes and in blank or lightly-inked areas.
Nozzle
One of many tiny holes in a printhead through which ink is deposited onto the substrate.
OMAS
Optical Media Advance Sensor. The sensor located in the print platen that tracks the substrate movement and
increases its accuracy.
Passes
The number of print passes specifies how many times the printheads will print on the same area of substrate. A
higher number of passes tends to improve print quality and printhead health, but reduces the speed of printing.
Platen
The flat surface within the printer over which the substrate passes while it is being printed on.
Printhead
A removable printer component that takes ink of one or more colors from the corresponding ink cartridge(s) and
deposits it on the substrate, through a cluster of nozzles.
Spindle
A rod that supports a roll of substrate while it is being used for printing.
Substrate
A thin, flat material designed to be printed on, made of paper or other materials.
Substrate advance compensation
A slight adjustment to the amount of substrate advance between print passes, to compensate for the characteristics
of different substrate types. The printer normally performs this adjustment automatically, but may need to be
recalibrated for substrates not supported by HP, or for an unusual ambient temperature or humidity. Incorrect
substrate advance compensation may cause banding with fewer than 8 passes, or graininess with 8 passes or
more.
Unidirectional
Unidirectional printing means that the printheads print only while moving in one direction. The speed of printing is
lower than in bidirectional. In general, print bidirectional and increasing the number of passes is a better way of
improving print quality.
Vacuum pressure
The substrate is held flat against the platen by vacuum suction. Too much or too little suction may cause print
quality defects. Too little suction may also cause a substrate jam or damage the printheads.
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