Canon ImageRunner iR8500 Series Service Manual page 324

Chapter 7
Component
Laser semi-conductor
Laser scanner motor (M4)
Polygon mirror
BD mirror/BD PCB
Laser driver PCB
Scanner motor driver PCB
7-2
Laser B
8-face mirror
Laser scanner motor
BD PCB
BD mirror
Description
Visible laser light (wave length: 675 nm; output: 7 mW),
twin-laser exposure
DC motor, 2-speed control; rotation speed: 40000 rpm
8-face
Used to detect laser beams.
Used to control laser activation.
Used to control the rotation of the laser scanner motor.
Laser A
80µm
Laser driver PCB
Laser unit
Collimating lens
Laser A
Laser B
18 pixels (760 µm)
F-7-2
T-7-2
Laser mirror
Photosensitive drum