Service manual

Chapter 5
5-2
F-5-1
T-5-3
5.1.5 Control System Configuration
0010-4801
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)
Name Function
[1] Photoconductive drum Receives laser beams to form a latent image.
[2] Laser mirror 1 (loop-back mirror) Reflects a laser beam toward laser mirror 2.
[3] Laser mirror 2 (loop-back mirror) Reflects a laser beam toward the photoconductor drum.
[4] BD PCB Generates a BD signal.
[5] Polygonal mirror Scans the photoconductive drum with a laser beam in the main
scan direction.
[6] Laser unit Emits laser beams.
[7] BD mirror Reflects a laser beam toward the BD PCB.
[1]
[2] [3]
[4]
[5]
[6]
[7]