Specifications

Chapter 2: PrinterTechnical Description
2-11
Drive and Xerographic Modules
1
Drive Assembly Consists of the Main Motor and gear cluster that generates and
transmits the mechanical energy that runs the printer.
2
ROS Assembly The Raster Output Scanner Assembly is the laser and the scanning
hardware. The ROS is made up of three major components.
Laser Diode Assembly (2a) (LD Assembly): Converts electrical
signals into optical signals. The LD Assembly generates the laser
beam and maintains the laser output power at a constant level.
Scanner Assembly (2b): Routes the laser beam to the drum, and
scans it across the drum surface. The Scanner Assembly consists
of a six sided Polygon Mirror attached to the Scanner Motor. The
Motor rotates at a constant speed. The spinning Polygon Mirror
reflects the beam, through a series of lens and mirrors, onto the
rotating drum surface. The movement of the spinning Polygon
Mirror scans the beam from one side of the drum to the other; one
scan line per mirror facet. This process repeats until the controller
stops sending image data to the laser.
Start–Of–Scan PWB (SOS PWB) (2c): A sensor that is in-line with
the scanned laser beam. The laser beam strikes the SOS PWB at
the start of each scan to let the printer control circuity know that a
new scan is beginning.
3
CRU PWB The Customer Replaceable Unit PWB consists of the CRU Switch
and the LD Switch. The CRU Switch is actuated when the CRU is
installed. The LD Switch is actuated when the CRU is installed. The
LD Switch is connected in series with the laser beam emitting
circuit, and functions as a laser safety switch. The laser functions
only when the CRU is installed.
4
Toner Sensor
Assembly
Contains the Toner Sensor (a magnetic sensor) that monitors the
toner level in the EP Cartridge. This sensor is ON when there is
enough toner in the EP Cartridge to make a print.
5
EP Cartridge The Electrical Photographics Cartridge consists of five major
components:
Drum (5a): An aluminum cylinder with a coating of photoconductive
material on the surface. The photoconductive property of the drum
allows the drum surface to hold an electrical charge in darkness,
and discharge it when exposed to light.
Bias Charge Roll (BCR) (5b): Places a uniform electrical charge
on the drum surface.
Magnet Roll (5c): Distributes toner to the drum surface.
Charge Metal Blade (CM Blade) (5d): Spreads an even coating of
toner on the Magnet Roll, and gives the Roll a static electric
charge.
Cleaning Blade (5e): Removes any residual toner left on the drum
from the last print cycle.