Canon NP6320 Service Manual page 186

CHAPTER 10 TROUBLESHOOTING
7. Adjusting the Position of the Mirrors (length of optical path between mirrors 1
and 2)
Adjust the tension of the scanner drive cable before making this adjustment. Adjust the posi-
tion of the scanner (mirror 1) by altering the tension of the scanner drive cable. (Loosen the cap
screws.)
Reference:
1. The cable will stretch after a large number of copies have been made, making readjustment
necessary.
2. An incorrect distance between mirror 1 and mirror 2 will cause an incorrect side-to-side repro-
duction ratio and poor focus, resulting in poor sharpness and fuzziness in the copy image.
1) Mark a line 10 mm from each edge of a piece of copy paper (B4), as shown in Figure 10-209.
2) Make a copy of the paper with the lines marked on it. (A)
3) Place a blank sheet of paper on the copyboard and feed the marked sheet of paper into the
copier. (Use manual feed.) (B)
• Passing the sheet through the copier indicates the amount of shrinkage caused by heat.
4) Align the lines on the left side of the copy sheet (A) and the sheet passed through the copier (B).
If the lines on the right are not in line, adjust the position of the scanner so that dimensions x
and y are equal.
x=y Correct
x>y Move the scanner in direction [a] (Figure 10-211).
x<y Move the scanner in direction [b] (Figure 10-211).
10-8
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10 mm
Figure 10-209
Figure 10-210
COPYRIGHT © 1999 CANON INC.
10 mm
Lines
x
Sheet A
Sheet B
y
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)