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2
Technical Explanation > Laser Exposure System > Various Controls > Laser ON/OFF control
Various Controls
■ Overview
Item
Laser ON / OFF control
Laser light is turned ON / OFF according to the combination of
laser control signal
Horizontal scanning
To align the writing start position in horizontal scanning direction.
synchronous control
Vertical scanning synchronous
To align the writing start position in vertical scanning direction.
control
Image Mask Control
This control prevents the laser beam from being emitted in non-
image area to avoid the Secondary transfer outer Roller from
getting dirt.
Laser scanner motor control
To rotate the scanner mirror by the specified speed.
APC control
To make the laser light per 1 line consistent amount
BD correction control
To correct the gap BD timing gap due to the angle variation of
Scanner Mirror.
DC Controller
PCB (UN04)
Laser ON/OFF control
Horizontal scanning
synchronous control
Vertical scanning
synchronous control
Main
Controller PCB
Image mask control
(UN81)
Laser scanner motor control
APC control
BD correction control
Dustproof shutter control
2
Technical Explanation > Laser Exposure System > Various Controls > Laser ON/OFF control
Operation description
T-2-20
Y/M/C/Bk
Laser Driver PCB
(UN05)
Polygon Motor
Laser Scanner Unit
F-2-59
■ Laser ON/OFF control
● Purpose
Laser light is turned ON / OFF according to the combination of laser control signal.
● Execution timing
After the power ON
● Control detail
DC Controller switches the 4 modes (forcible OFF mode, APC mode, Print mode and standby
mode) according to the laser control signal.
Main Controller
PCB (UN81)
Laser ON
/OFF signal
ASIC
ASIC
APC signal
Laser Driver PCB
Video signal
Mode
Laser status
Forcible OFF mode
OFF
APC mode
ON
Print mode
ON / OFF
Standby mode
OFF
Print
Image formation
instruction
ready timing
PSTBY
PINTR
At 1st line (APC)
LaserA
At 2nd line (APC)
LaserB
Mode
Standby
APC mode
APC mode / Print mode
name
mode
DC Controller
PCB (UN04)
CPU
Y/M/C/Bk
Laser
Beam
(UN05)
Polygon Mirror
Remark
Light intensity setting decided on APC is cleared.
Laser light intensity adjustment
Laser is emitted according to the video signal.
Host machine is in standby status.
PRINT
LSTR
PSTBY
Forcible
Standby
OFF mode
mode
2-48
F-2-60
T-2-21
F-2-61
2-48
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