Laser/scanner system
The laser/scanner system forms the latent electrostatic image on the photosensitive drums inside
each of the imaging drums. The product has two laser/scanners: one for yellow and magenta and the
other for cyan and black.
The DC controller receives instructions from the formatter regarding the image of the page to be
printed. The DC controller signals the lasers to emit light, and the laser beams pass through lenses
and onto the scanner mirror, which rotates at a constant speed. The mirror reflects the beam onto the
photosensitive drum in the pattern required for the image, exposing the surface of the drum so it can
receive toner.
Figure 1-8 Laser/scanner system
Scanner mirror
Scanner motor unit
Photosensitive drum (Bk)
BD sensor
Laser driver
Formatter
DC controller
LASER CONTROL signal
VIDEO signal
SCANNER MOTOR SPEED CONTROL signal
BD INPUT signal
Photosensitive drum (C)
Black laser
Cyan laser
26 Chapter 1 Theory of operation ENWW
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