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2. The APC mode is set for the Laser Driver PCB's IC, and the laser diode of each color is forcibly activated. The photo diode
(PD) monitors the laser diode (LD), and the Laser Driver IC adjusts the output of laser diode until the laser light intensity
reaches a specified level.
Main Controller
Related error codes
• E100-0004:Laser Scanner error
BD Detection Correction Control
Purpose
Corrects the displacement of each color's laser write start position due to Polygon Mirror accuracy and Polygon Motor rotation
accuracy.
Execution timing
At power-on, and at printing
Control description
1. The DC Controller PCB measures the BD interval after the completion of constant speed rotation control of the Scanner
Motor.
2. The DC Controller PCB calculates the correction value from the displacement of the BD interval.
3. The write start position is corrected by adjusting the write start timing based on the above correction value.
APC signal
PCB (UN81)
Laser Scanner Unit
Laser Driver
PCB (UN05)
44
2. Technology
Laser
LD
LD
PD
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