Controlling Laser Activation - Canon GP605 Service Manual

CHAPTER 5 LASER EXPOSURE SYSTEM
B.

Controlling Laser Activation

Figure 5-301B shows the construction of the system used to control laser activation.
This signal is used to decrease the laser intensity
between sheets to prolong the life of the laser.
Reset signal per scan.
Laser activation
signal for sampling
When the laser activation
prohibit signal is
'1', activation is disabled.
When the laser OFF signal is '1' , the laser turns off.
Figure 5-301B Construction of the Control System
5-8
COPYRIGHT © 1999 CANON INC.
J1107
GND
1 1
GND
2 2
Not used
3 3
SH-D-B
4 4
RST-B
5 5
LD-DWN
6 6
Not used
7 7
SH-D-A
8 8
RST-A
9 9
10
10
Intensity control signal
18 18
GND
19 19
LD-EN-B
20 20
LD-EN-A
21 21
LD-OFF-B
22 22
LD-OFF-A
23 23
Not used
24 24
BSH-B
25 25
BSH-A
26 26
SH-B
27 27
SH-A
28 28
GND
29 29
GND
30 30
Relay PCB
J1714
Laser driver PCB 1
1 2 3 4 5 6
J1301
J1354
To LD-A/B
To LD-A/B
Laser driver PCB 2
Sampling during wait activation
Sampling during imaging activation
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Laser B
Intensity monitor
Laser A