General Information 1-47
4025-XXX
Printhead Components
The Printhead Assembly is made up of one major component housing a number of sub-
components.
CAUTION: The Printhead generates a laser beam. The laser beam is a very powerful
and narrow beam of light that produces extreme heat at its focal point. The laser beam in
the printer is invisible. Although you cannot see the beam, it can still cause severe eye
injury. Never place a mirror or a reflective tool in the laser beam path. Never run the
printer with the covers removed or the interlocks bypassed.
Housed inside the Printhead Assembly:
1. Laser Diode Assembly (LD)
A semiconductor Laser Diode that generates a 5 milliwatt class 3B laser beam.
Circuity on the LD PWB maintains the laser output power at a constant level. The LD
PWB is electrically connected to the MCU PWB. The MCU provides power, control
circuitry, and the video data input supplied by the host computer.
2. Corrective Lenses and Angled Mirror
Four lenses, two small, one medium, and one wide, and an angled mirror focus the
laser beam and direct it toward the Polygon Mirror.
3. Polygon Mirror
A twelve-side rotating mirror that is attached to the Scanner Motor Assembly. The
movement of the rotating Polygon Mirror reflects the laser beam in a sweeping
motion, from side to side across and through the wide lens.
4. Scanner Motor Assembly
The Scanner Motor Assembly is attached to the Scanner Motor Assembly PWB. The
+24VDC Motor rotates at a constant speed. The Scanner Motor Assembly is
electrically connected to the MCU.
5. Wide Lens
A lens that focuses the beam coming from the Polygon Mirror and directs it onto the
Angled Mirror.
6. Drum Mirror
Angled so it reflects the laser beam coming from the Angled Mirror, down onto the
surface of the drum.
7. SOS PWB (Start Of Scan Sensor)
The SOS Sensor is in-line with the laser beam sweep. The laser beam strikes the
SOS Sensor at the beginning of each sweep to let the printer control circuity know
that a new scan has started. The SOS PWB is electrically connected to the MCU
PWB.
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