Phaser 6180 Color Laser Printer Service Manual 2-31
Theory of Operation
Laser Unit
The Laser Unit is an exposure unit that generates laser beams to form 
electrostatic latent image on the drum surface. The Laser Unit consists of the 
following components: Laser Diode (LD), Scanner, Start of Scan (SOS) 
Board, Lenses, Mirror, and Window.
s6180-277
Laser Unit
Rear View
Mirror
Mirror
Laser
Diodes
Laser 
Diode 
Board
Lens
Scanner
Polygon Mirror
Window
SOS 
Sensor
SOS Board
Front