Canon imageRUNNER ADVANCE 525 I, Service Manual

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Scanner Motor Control
Purpose
Rotates the Scanner Motor at a specific speed.
Execution timing
At power-on, and at printing
Control description
The Scanner Motor rotation speed is controlled by the DC Controller PCB.
1. The DC Controller PCB outputs Scanner Motor control signals (acceleration signals and deceleration signals) to the Scanner
Motor to rotate the Polygon Mirror.
2. The DC Controller PCB stabilizes the Scanner Motor rotation speed, referring to the motor’s rotation speed signals.
(From when the Scanner Motor starts rotation until it reaches the target revolutions and the machine starts image formation
process)
3. When laser beams are emitted at image formation, the DC Controller PCB detects the BD signal.
4. The DC Controller PCB controls the Scanner Motor control signals (acceleration signals and deceleration signals) based on
the input timing of the BD signal to control the Scanner Motor rotation speed.
Acceleration signal
Deceleration signal
Scanner Motor rotation speed signal
DC Controller
PCB(UN04)
Laser
Y/M/C/K
Laser Driver
PCB (UN05)
Laser Scanner Unit
Scanner
Motor
BD
signal
BD
sensor
Related error codes
• E110-0001
Laser Scanner Motor startup error
• E110-0002
Laser Scanner Motor rotation error
APC (Auto Power Control)
Purpose
Ensures constant laser beam light intensity for each line.
Execution timing
For each line (before writing the image)
Control description
1. The Main Controller PCB outputs the APC signal to the Laser Driver IC in the Laser Driver PCB.
2. Technology
43