Various Controls - Canon iR4570 Series Service Manual

6.3 Various Controls

6.3.1 Controlling the Laser Activation Timing
6.3.1.1 Turning On and off the Laser Light
iR2270 / iR2870 / iR3570 / iR4570 / iR3530
The laser light is turned on and off according to the combination of laser control signals (CNT0/1/2) from the DC
controller PCB.
Laser control signal
CNT2
0
0
0
0
1
0
0
0
Laser status
CNT1 CNT0 Laser A
1 0 ON (for APC control)
1 1 OFF
0 1 OFF
1 1 OFF
Video signal input
1 1
enabled
1 1 OFF
0 1 OFF
1 1 OFF
T-6-7
Laser B
OFF
OFF
ON (for APC control)
OFF
Video signal input
enabled
OFF
ON (for APC control)
OFF
Chapter 6
0006-5973
6-7