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COPYRIGHT © 1999 CANON INC.
CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
5-7
CHAPTER 5 LASER EXPOSURE SYSTEM
C. Switching the Laser Activation Mode
The laser beam is turned on for control of image signals and, in addition, for detection of BD
signals (full activation), selected using the laser activation mode switching signal (serial
communication) from the image processor PCB.
D. Switching the Laser Output
The laser output may be either high or low, and control is made so that images appropriate to
either mode may be obtained. The output modes are switched by changing the target voltage under
APC control in response to the laser output switching signal (serial communication).
These laser outputs are used as shown in Table 5-300:
Table 5-300
Laser output
Low
High
Mode
When low density is selected for memory copying.
Other than above.
Figure 5-301
Developing DC bias
-530V
-560V
-585V
-610V
Laser output low
Copy density
[Memory Copying]
Laser output high
Darker
Lighter
-2
-1
0
1
2
Содержание GP335
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