Controlling The Intensity Of Laser Light; Apc Control; Pwm Control - Canon iR C3200 Series Service Manual

Print request signal
(Start key ON)
Laser scanner
motor (Y,M,C,Bk)
PTOP signal
Y-TOP signal
Laser Y ON
M-TOP signal
Laser M ON
C-TOP signal
Laser C signal
Bk-TOP signal
Laser Bk ON

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.

8.3.2.2 PWM Control

- A single pixel is divided into 32, and a 16-level activation pattern is selected to suit the image data in question.
Image formation
enable timing
PSTBY PINTR
Used to stabilize
rotation (3.5sec)
Lowest intensity 1 2 3 4 5 6 7 26 27 28 29 30 31 32
1 2 3 4 5 6 7 26 27 28 29 30 31 32
ON
1 2 3 4 5 6 7 26 27 28 29 30 31 32
ON
16 levels of
1 2 3 4 5 6 7 26 27 28 29 30 31 32
intensity
ON
1 2 3 4 5 6 7 26 27 28 29 30 31 32
ON
1 2 3 4 5 6 7 26 27 28 29 30 31 32
ON
Highest intensity 1 2 3 4 5 6 7 26 27 28 29 30 31 32
ON
PRINT
F-8-9
Pixels
F-8-10
Chapter 8
LSTR PSTBY
0000-4460
0000-4461
8-9