Controlling Synchronization In Sub Scanning Direction; Controlling The Intensity Of Laser Light; Apc Control - Canon imagerunner C5180 Service Manual

Chapter 8

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.
Print request signal
(Start key ON)
PSTBY
Polygon mirror motor
Y,M,C,Bk
PTOP signal
Y-TOP signal
Laser Y activation
M-TOP signal
Laser M activation
C-TOP signal
Laser C activation
Bk-TOP signal
Laser Bk activation
*1iRC5180:1.6s,IRC4580/3880:1,4s

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.
8-10
Image formation
ready timing
PINTR
For stabilization
of rotation*1
F-8-9
PRINT LSTR PSTBY