Canon 1000 Service Manual page 127

6. Correcting a Discrepancy in the
Sub Scanning Direction
If the coordinates of centers in the pattern are
different (in Figure 3-437, ∆X is not 0), the image
start position in the sub scanning direction is likely
to have a discrepancy. Correction is made so that
∆X will be closer to 0. (In the case of Figure 3-437,
the Y start position will be advanced until it is the
correct position.)
The correction is made by varying the read enable signal for the Y, C, and Bk video signals (T2 of Figure
3-438). In the case of Figure 3-437, T2 is extended to delay the timing for the Y image start.
Image leading signal (ITOP)
Y read enable signal (YMRE)
Y print enable signal (YPE)
Y print area signal (YFRM)
COPYRIGHT © 2001 CANON INC.
Figure 3-438
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATION AND TIMING
Correct center
Feeding direction
Figure 3-437
T2
1st page
Paper length (feeding direction)
Image area
Y
∆X
3-83