Theory of Operation 2-19
■ The Laser Assembly is field replaceable and contains the laser diodes, scanner
motor/mirror, and several lenses and mirrors.
■ The Laser Assembly “reflects” the laser beam so it strikes the Drum.
Caution
Never remove the cover from a Laser Assembly for any reason - contamination
may result.
The Laser Assembly consists of four components: the Laser Diode (LD) Assembly,
the Scanner Assembly, Lenses and Mirrors, and the Start of Scan (SOS) board.
Laser Assembly Components
Component Function
Laser Diode Assembly Produces two laser beams that are turned on and off according
to the print data signal.
Scanner Assembly Consists of a faceted polygonal mirror mounted on the shaft of
the scanner motor that reflects the beams to the drum surface
through lenses and mirrors, to scan the beams across the drum.
Start of Scan Board When the laser beams strike the sensor on the SOS board, the
signal generated indicates the initial position of the scan. The
initial position where a scan is started on each line is detected.
s5500-030
Polygon Mirror
Scanner Motor
Dual Beam Laser Diode
Start Of Scan
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