Apc(Auto Power Control) Control - Canon imageRUNNER ADVANCE C3325 Series Service Manual

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Technical Explanation > Laser Exposure System > Controls > APC(Auto Power Control) control
Related Error Code:
E100-0001: BD error
The BD lock was unlocked although it had been locked once.
E110-0001: Scanner Motor error
At startup, the speed was not locked by FG control.
E110-0002: Scanner Motor error
At startup, the speed was not locked by BD control.
E110-0003: Scanner Motor error
At startup, the phase was not locked by BD control.
E110-0004: Scanner Motor error
The laser exposure timing correction of the Polygon Mirror was not detected after phase
lock by BD control.
2 Technical Explanation > Laser Exposure System > Controls > APC(Auto Power Control) control

■ APC(Auto Power Control) control

● Purpose
Ensures constant laser beam light intensity for each line.
● Execution Timing
For each line (before writing the image)
● Control description
1) The Y/M Laser Driver PCB outputs the APC signal to the Laser Driver IC on each Laser
Driver PCB.
2) The APC mode is set for the Y/M and C/Bk Laser Driver PCB ICs, and the laser diode of
each color is forcibly emitted. The photo diode (PD) monitors the laser diode (LD), and
each Laser Driver IC adjusts the output of laser diode until the laser light intensity reaches
a specified level.
Laser Scanner Unit
Y/M Laser Driver
PCB(UN08)
APC Signal
ASIC
C/Bk Laser Driver
PCB(UN09)
2-31
Y Laser
LD
LD
PD
M Laser
LD
LD
PD
C Laser
LD
LD
PD
Bk Laser
LD
LD
PD
F-2-43
2-31