Canon imageRUNNER ADVANCE C3330 Series, Service Manual

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Item Operation description
APC(Auto Power Control) control Ensures constant laser beam light intensity for each line. “APC(Auto Power Control)
control” on page 59
BD correction control Corrects displacement of BD timing for the displacement of the
Polygon Mirror angle. “BD correction control” on
page 60
Horizontal scanning
synchronous control
Vertical scanning
synchronous control
Image mask control
APC control
BD correction control
Laser scanner motor control
Laser ON/OFF control
Main
Controller PCB
(UN05)
DC Controller
PCB (UN04)
Laser Scanner Unit
Laser Scanner Motor
Y/M/
Laser Driver PCB
(UN08)
C/Bk
Laser Driver PCB
(UN09)
■ Laser ON/OFF control
Purpose
Turns the laser beam ON and OFF according to the combination of laser control signals.
Execution timing
After Power-On
Control description
The DC Controller switches between four modes (Forced OFF mode, APC mode, Print mode, and Standby mode) by laser control
signals.
DC Controller
PCB (UN04)
CPU
Main Controller
PCB(UN05)
Video signal
ASIC
Laser ON
/OFF signal
Laser Scanner
Motor
Laser
Beam
Y/M/C/Bk
Laser Driver
PCB (UN08)
C/Bk
Laser Driver
PCB (UN09)
ASIC
APC signal
Mode Laser Status Remarks
Forced OFF mode OFF Clears the light intensity setting determined by the APC.
APC mode ON Adjusts the laser light intensity.
Print mode ON/OFF Emits the laser according to the video signal.
Standby mode OFF The machine is in standby mode.
2. Technology
56