Canon 1000 Service Manual page 125

4. Correcting a Discrepancy in
Reproduction Ratios
If the distances between centers (Lm and Ly
in Figure 3-432) are different, the reproduction
ratio in the main scanning direction is likely to be
incorrect. Here, correction is made so that Ly will
be closer in value to Lm.
The correction is made by shifting the image
position correction mirror horizontally, thereby
changing the length of the optical path for the laser
beam (Figure 3-433).
In the case of Figure 3-432, the length of the
optical path is increased, thereby increasing the
width of scanning.
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATION AND TIMING
Y
Feeding
direction
Figure 3-432
Polygon mirror
Y drum
Image position
correction mirror
Polygon mirror
Figure 3-433
M
Ly Lm
Image position correction mirror
3-81