Canon Color imageRUNNER C4580 Service Manual - page 223
Chapter 8
8-10
8.3.1.3 Controlling Synchronization in Sub Scanning Direction
- The synchronization in sub scanning direction is controlled with reference to the PTOP signal (image
formation start signal).
- When the mechanism becomes ready for image formation, the PTOP signal (image formation start signal) is
generated, turning on the individual lasers based on the signal.
F-8-9
8.3.2 Controlling the Intensity of Laser Light
8.3.2.1 APC Control
The machine uses the photodiode mounted on the laser driver PCB to monitor the intensify of laser light so as
to ensure that it remains at a specific level.
PSTBY
PSTBY
PINTR
LSTR
Laser Y activation
Laser M activation
Laser C activation
Laser Bk activation
PTOP signal
Y-TOP signal
M-TOP signal
C-TOP signal
Bk-TOP signal
Polygon mirror motor
Y,M,C,Bk
For stabilization
of rotation*1
Print request signal
(Start key ON)
Image formation
ready timing
*1iRC5180:1.6s,IRC4580/3880:1,4s