Controls; Overview; Laser On Timing Control - Canon imageRUNNER ADVANCE 6075 Series Service Manual

2
Technology > Laser Exposure System > Controls > Laser ON Timing Control

Controls

■ Overview

Laser Interface PCB
Laser ON/OFF Control
Horizontal scanning synchronous
Control
Vertical Scanning synchronous
Main Controller
Control
PCB 2
APC Control
Polygon Motor Control
Laser Shutter Control
tem
Turn ON/OFF a laser beam according to the combination
Laser ON/OFF control
of laser control signals.
Laser ON
Main scanning Performed to adjust the writing position in the main
timing
synchronization control scanning direction.
control
Sub scanning Performed to adjust the writing position in the sub
synchronization control scanning direction.
Laser beam 1Performed to keep a specified level of laser beam for
APC control
intensity control each line.
To be executed to rotate the Polygon Mirror at the
Laser polygon motor control
specified speed.
To prevent exposure of laser light in the machine when
Laser shutter control
the Cover is open.
2 Technology > Laser Exposure System > Controls > Laser ON Timing Control
Laser Scanner Unit
Laser Driver PCB
Polygon Motor Unit
F-2-51
Purpose/Description
T-2-21

■ Laser ON Timing Control

● Laser ON/OFF Control
This control is performed to turn ON/OFF a laser beam according to the combination of laser
control signals.
Control signal
DC
Laser
Controller
Driver
PCB
PCB
Video signal
<Timing of Execution>
After the power is turned ON
<Details of the Control>
The DC controller switches the mode among four modes (Forcible OFF mode, APC mode,
Print mode, Standby mode) according to the laser control signal.
Mode Laser status
Forcible OFF OFF Clear the laser beam intensity setting determined by APC.
APC ON Adjust the laser beam intensity.
Print mode OFF/ON Irradiate a laser beam according to the video signal.
Standby mode OFF The main unit is placed in the standby status.
2-39
Polygon Mirror
Laser Beam
F-2-52
Remarks
T-2-22
2-39