Apc (Auto Power Control) Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2
Print instruction
Reference
signal
Video request signal
(PVREQ)
T1
About15ms
Video signal
(VDO)
About15ms
2
T2
Y
M C Bk

APC (Auto Power Control) control

Purpose
This is to make the laser light for 1 line consistent amount.
Execution timing
Per each line (before image writing)
Execution time
Approx. 2 µs
F-2-57 F-2-57
Control details
1) DC Controller outputs the laser control signal to the Laser Driver IC on the Laser Driver
PCB.
2) APC mode is specified to the Laser Driver IC and it forcibly emits the laser diode of each
color. At the same time, each laser driver IC monitors the laser diode (LD) on the photo
diode (PD) and adjusts the output of laser diode until the light intensity becomes consistent
amount.
2-33
2-33