Control System Configuration; Various Controls; Controlling The Laser Activation Timing; Laser Emission On/Off Control - Canon iR2030 Series Service Manual

Chapter 5
Name
[5] Polygonal mirror
[6] Laser unit
[7] BD mirror

5.1.4 Control System Configuration

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)
Image Processor
PCB

5.2 Various Controls

5.2.1 Controlling the Laser Activation Timing

5.2.1.1 Laser Emission ON/OFF Control

The purpose of this control is to turn ON/OFF the laser diode (LD) in response to video signals.
The DC controller PCB sends laser control signals (CNTRL0, CNTRL1, and CNTRL2), which are used to switch between laser driver operation modes, to the laser
driver IC along with video signals (VDO1, /VDO1, VDO2, and /VDO2). The laser driver IC controls laser emission (ON/OFF) according to the combination of
CNTRL0, CNTRL1, and CNTRL2 signals.
5-2
Function
Scans the photoconductive drum with a laser beam in the main
scan direction.
Emits laser beams.
Reflects a laser beam toward the BD PCB.
DC Controller PCB
IC5
J206
[1]
[4]
F-5-2
J205
[2] [3]
0017-2648
0017-3094