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control unit. The printed circuit board (PCB) that
supplies the printer's connection path to the
customer's network. The control unit also gives
commands to the print engine dc controller PCB to
manipulate the motors, solenoids, and actuators
during a print cycle. See also actuator, solenoid.
controller. See control unit.
corona. See separation corona.
cursor-position push buttons. The left and right
arrow buttons that you press to enter text and
numbers for some menu settings (such as a
password or a numeric setting).
customer CD-ROM. A CD-ROM holding the user
software for the printer, including the IBM Color
Calibrator, Downloader, and Spooler utilities and
the PostScript color pages.
customer engineer (CE). An IBM representative
who services IBM products at the customer's site.
cutout. An area of the printer that is shaped ("cut
out") to hold a connecting mechanism such as a tab
on another part of the printer.
D
daemon. A software program that runs
unattended.
danger notice. A notice used to call attention to a
condition that is potentially deadly or extremely
dangerous to people.
dedicated file server. In a local area network
(LAN), a file server whose function is to provide
services to the users of the network and to run the
network operating system.
densitometer. An instrument that measures
density according to a specified standard. Status T
and XRite densitometers are two such color
calibration devices.
density. A precise measurement of the light
energy transmitted or reflected by a surface in the
presence of a standard light source.
density control panel. The set of controls on the
back of the printer that enable you to adjust the
density of any of the four colors: magenta, cyan,
yellow, or black.
density detection sensor. A device on the printer
containing a light source and a sensor. The density
detection sensor measures the specific density of
toner applied to known surface to regulate the
quantity of toner applied during the print process.
The reflectance of light on toner varies with the
density and color of that toner. Thus the density
detection sensor emits a specific amount of light on
a toner patch and estimates the density of the toner
patch by the amount of light reflected from the toner
patch.
density gauge. A row of indicators on the printer's
density control panel. When you make a test print,
the indicator on the gauge goes on to confirm the
test pattern you chose for the test print: solid colors,
solid white, gradient, horizontal lines, vertical lines,
or grid pattern. See also gradient.
dequeue. To remove items from a queue.
Contrast with queue .
desktop. In a graphical user interface (GUI), a
computer representation of day-to-day work; for
example, a desktop with open file folders.
desktop publishing (DTP). The use of a PC or
other platform as an inexpensive production system
for generating typeset-quality text and graphics.
dialog box. In a graphical user interface (GUI), an
on-screen message box that interacts with the user
to convey or request information. See also
graphical user interface (GUI) .
diagnostic mode. A mode of operation in which
the printer can check itself in case of a problem.
Direct queue. A storage area for the printer that
supplies a direct connection to the printer. When
you submit a job to the Direct queue, the printer
accepts the job when it is ready to print the job.
Jobs in the Direct queue are not stored on the
printer's hard disk and are not spooled. See also
Hold queue, Print Queue, Printed queue, spooling.
discharging. The application of ac bias by the
printer's discharge roller to remove any charges
remaining on the transfer drum surface after
separation of the paper.
X–5
Glossary
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