
Figure 3-404
2. Switching the Laser Output
The laser output may be either high, medium, or low, ensuring the best image for the selected mode.
The output is switched by the output signal “intensity selection signal 0, 1, 2” from the image processor
PCB.
Each of these laser outputs is used for its respective mode as shown:
Photo output
Laser output characteristics
at temperature T1
Laser output characteristics
at temperature T2
current
Laser output
I
b
(T
1
) : Bias current for temperature T1
I
b
(T
2
) : Bias current for temperature T2
I
b
(T
1
)
I
b
(T
2
)
Drive current
3–55
COPYRIGHT © 1996 CANON INC. CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING
Laser output
Mode
High
Text mode, text/photo mode
Medium
Photo mode, FAX output
Low
Printer output