Control System Configuration - Canon iR2020 Series Service Manual

Chapter 5
Name
[1] Photoconductive drum
[2] Laser mirror 1 (loop-back mirror)
[3] Laser mirror 2 (loop-back mirror)
[4] BD PCB
[5] Polygonal mirror
[6] Laser unit
[7] BD mirror

5.1.5 Control System Configuration

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
The laser exposure system is controlled mainly by the IC5 on the DC controller PCB.
Main control types are as follows:
[1] Laser emission ON/OFF control/video signal input
[2] Horizontal synchronization control
[3] Laser scanner motor control
[4] Automatic photocurrent control (APC)
5-2
[2]
[1]
[7]
[6]
F-5-1
T-5-3
Function
Receives laser beams to form a latent image.
Reflects a laser beam toward laser mirror 2.
Reflects a laser beam toward the photoconductor drum.
Generates a BD signal.
Scans the photoconductive drum with a laser beam in the main
scan direction.
Emits laser beams.
Reflects a laser beam toward the BD PCB.
[3]
[4]
[5]
0010-4801