2
2
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Technology > Laser Control System > Various Controls > APC control
Technology > Laser Control System > Various Controls > APC control
■
Sub scanning synchronous control
Purpose
To align the write start position in sub scanning direction.
Execution timing
Per printing
Execution time
Approx 16ms
Operation
1) When the leading edge of paper reaches the image reference sensor
(PS41 or PS42), DC controller generates the sub scanning synchronous
signals (PVREQ) and sends them to the main controller.
2) Main controller is synchronized with PVREQ signals and sends the VDO
signals to the DC controller.
3) DC controller emits the laser based on the VDO signals to align the
leading edge of image and the leading edge of paper.
Main
controller
Print command
PVREQ
VD0
DC
controller
Laser drive
signal
Image reference
sensor
(PS41/PS42)
Print paper
Feeding
direction Feeding
Paper
Light guide
PS41
PS42
1)
2)
3)
T-2-21
F-2-30
Image reference
sensor (PS41/PS42)
Print command
Video request
signal (VSREQ)
Video signal
(VD0)
T2
T1
Approx. 15ms
Approx. 1ms
MEMO :
PS41 is the reference sensor for ones other than transparency and PS42 is the
reference sensor for transparency.
■
APC control
Purpose
To even out the laser light per 1 line
Execution timing
Per line
Execution time
Approx. 2µs
Operation
1) DC controller PCB outputs the laser control signal to the laser driver on
the laser driver PCB.
2) APC mode is specified on the laser driver IC and it forcibly emits the
laser diodes (LD1 to LD4). Laser driver IC monitors the laser diodes (LD1
to LD4) at the photo diode (PD) simultaneously and adjusts the laser
diode outputs until they reach the specified intensity.
Laser driver IC
LD1
LD4
PD
DC controller
LD2
LD3
Laser driver PCB
Laser control
signal
F-2-31
T-2-22
F-2-32
Summary of Contents for imagePRESS 1110
Page 242: ...3 3 Periodical Service Periodical Service Periodical service item ...
Page 655: ...5 5 Adjustment Adjustment Overview When replacing parts Major adjustment ...
Page 944: ...8 8 Service Mode Service Mode Overview COPIER FEEDER SORTER BOARD Situation Mode ...
Page 1555: ... Service Tools General Circuit Diagram General Timing Chart Operator Maintenance Appendix ...