Canon imageRUNNER ADVANCE C350 series Service Manual page 94

2
Technical Explanation > Laser Exposure System > Various Controls > APC(Auto Power Control) Control
■ APC(Auto Power Control) Control
● Purpose
This is to make the laser light for 1 line consistent amount.
● Execution timing
Per 1 line. (before print writing)
● Control detail
1) The Main Controller outputs the APC signal to the Laser Driver IC in the Y/M/C/Bk Laser
Driver PCB.
2) The Y/M/C/Bk Laser Driver PCB IC is set in APC mode, and forcibly emits laser diode of
each color. 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
Main Controller APC Signal
PCB (UN81)
2 Technical Explanation > Laser Exposure System > Various Controls > APC(Auto Power Control) Control
Y Laser
LD
LD
PD
M Laser
LD
LD
PD
Y/M/C/K
Laser Driver C Laser
PCB (UN05)
LD
LD
PD
Bk Laser
LD
LD
PD
Related error code
• E100-0100: BD error
The BD lock was unlocked although it had been locked once.
• E110-0001: Scanner Motor error (FG lock)
The speed was not locked by FG control within 5.5 sec after startup.
• E110-0002: Scanner Motor error (BD speed lock)
The speed was not locked by BD control within 5.5 sec after startup.
• E110-0003: Scanner Motor error (BD phase lock)
The phase was not locked by BD control within 5.5 sec after startup.
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