Canon NP6317 Service Manual page 51

3. Adjusting the Mirror Position (op-
tical distance between No. 1 and
No. 2 mirrors)
Adjust the position of the mirror after at-
taching the scanner cable.
To adjust, relocate the fixing used for the
No. 1 mirror mount; loosen the two screws.
Note:
i. The cable tends to become slack as
more and more copies are made, re-
quiring adjustment.
ii. If the horizontal reproduction ratio
becomes faulty because of inaccurate
optical distance between the No. 1
and No. 2 mirrors, the images on cop-
ies will become out of focus.
1) Draw a line 1 cm from both ends of copy
paper (A4 or A3) as shown in Figure 3-
505.
2) Make a copy of the sheet on which lines
have been drawn; call the copy obtained
this way "sheet A."
3) Place a blank sheet of paper on the
copyboard, and feed the sheet on which
lines were drawn in the manual mode; call
the delivered-sheet "sheet B."
• Sheet B will show contraction by heat.
4) Put the left lines on sheet A and sheet B
together, and adjust the position of the No.
1 mirror mount so that x and y in Figure 3-
406 are identical.
x=y correct
x>y move the No.1 mirror mount into the
direction of [a]
x<y move the No.1 mirror mount into the
direction of [b]
COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
1cm
Lines
Figure 3-505
x
y
Figure 3-506
No.1mirror mount
(front)
a
Mirror drive cable
(rear)
Figure 3-507
1cm
Sheet A
Sheet B
Fixing screws
b
3-15