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COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
5-7
CHAPTER 5 LASER EXPOSURE SYSTEM
III . LASER DRIVER PCB
A. Outline
Figure 5-301 shows items of control related to the laser driver circuit:
[1] Turning on and off the laser.
[2] Controlling the intensity of the laser.
Figure 5-301 Function Construction
Image processor PCB
J1106
J1107
J1354
J1353
1
16
17
20
21
24
25
40
VIDEO-B
VIDEO-A
CLK-B
CLK-A
Image signals for the laser B
Laser driver PCB 2
Laser driver PCB 1
1
2
3
4
5
6
Relay PCB
Clock pulses for the laser B
10
18
1
9
10
18
1
9
19
30
1
16
17
20
21
24
25
40
Light intensity
control signal
Activation control
signal
5V
8V
-8V
GND
GND
GND
J1301
J1714
LD-BLD-A
Laser B
Laser A
Intensity monitor
EEPROM
[1]
The laser diode is turned on
to suit the image signal.
19
30
[2]
VR for image area activation adjustment