Canon NP6621 Service Manual page 241

7. Adjusting the Lower Fixing Roller
Pressure (nip)
If fixing faults are noted, make adjustments as
follows:
The nip is correct if it is as indicated in Figure 4-
718; otherwise, turn the bolt to adjust.
c
A4 size
Feeding
direction
b : 4.5 ± 0.5mm
| a-c | : 0.5mm or less
Figure 4-718
Note:
a and c represent points 10 mm from both ends
of paper.
a. Measuring the Nip
Measure the nip before starting to use the copier
for the day.
1) Open the copyboard cover, and make an A4
solid black copy.
2) Place the copy with its solid black facing down
in the cassette.
3) Press the service mode switch (SW850) with a
hex key.
• The machine starts service mode and indi-
cates '1'.
4) Press '4' on the numeric key pad.
• The machine indicates '4'.
5) Press the AE key.
• The machine starts operation/inspection mode
and indicates '401'.
6) Press '6' on the numeric keypad.
• The machine indicates '406'.
7) Press the Start key.
• The machine picks up paper from the cassette,
allows measurement as in Figure 4-718, and
discharges paper.
COPYRIGHT © 1998 CANON INC.
b Center of paper
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Reference:
The paper will be stopped halfway sandwiched
between the fixing rollers; it will be discharged
about 10 sec later.
8) Measure the nip.
MECHANICAL SYSTEM
4–49