Canon NP6251 Service Manual page 341

 
15. Adjusting the Nip (tightening the pressure adjusting nut)
The nip width is correct if it is as indicated in Table 6-201. Otherwise, turn the
pressure adjusting nut.
Caution:
a and c represent points 10 mm from both ends of copy paper.
*Be sure both upper and lower rollers are
a. Measuring the Nip
Wait for 15 min after the copier finishes its warm-up period, and make 20 copies of
A4; then, perform the following to measure the nip:
1) Place A3 paper, and select A3.
2) Open the copyboard cover.
3) Start service mode (*4*); using the >> key, select 'NIP' in nip measurement mode.
4) Press the * key (user mode).
The machine will pick up paper, and will be ready for measurement.
Reference:
The paper will be stopped halfway once; it will then be automatically discharged in
about 10 sec.
5) Measure the nip.
COPYRIGHT © 1997 CANON INC.
Download service manual and resetter printer at http://printer1.blogspot.com
Feeding
direction
Figure 6-229
Dimensions
b
| a – c |
sufficiently warm before taking measurements.
Table 6-201
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
c
b
Center of
copy paper
a
Measurements*
7.3 ± 0.5 mm
0.5 mm or less
6-33