Controlling Laser Activation - Canon ImageRunner iR8500 Series Service Manual

Clock pulses for the laser B
Image signals for the laser B

7.3.2.2 Controlling Laser Activation

iR105i/iR105+ / iR9070 / iR85+ / iR8070
The following figure shows the construction of the system used to control laser activation.
Relay PCB
1 2 3 4 5 6
J1106
J1301
1 1
VIDEO-B
16 16
17
17
CLK-B
20 20
21
21
CLK-A
24
24
25 25
VIDEO-A
40 40
J1353
J1107
J1354
Light intensity
10 10
control signal
18 18
Activation control
1 1
signal
9 9
19 19
30
30
Laser driver PCB 2
[2]
VR for image area activation adjustment
[1]
J1714
The laser diode is turned on
to suit the image signal.
Laser driver PCB 1
EEPROM
F-7-6
Laser B
Intensity monitor
Laser A
Chapter 7
0006-9518
7-5