Canon imageRUNNER ADVANCE 6055 Series, Service Manual

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