After Disassembling The Fixing Unit - Canon iR C3200 Series Service Manual

11.5.9.5 After Disassembling
the Fixing Unit
If you have loosened the adjusting screw used to
secure the upper frame and the lower frame of the
fixing unit in place (as when replacing a roller), be
sure to adjust the nip of the fixing roller as follows:
1) Turn the adjusting screw [1] at the front/rear so that
the length of the pressure spring is 31.5mm.
F-11-161
2) Fit the fixing unit in the machine, and execute the
following service mode to measure the nip:
COPIER>FUNCTION>FIXING>NIP-CHK
Paper
movement
Standard:
|a c| = 0.5mm or less
a
F-11-162
3) Adjust the balance between the front and the rear:
4) If the median value of the measured nip is toward
the lower limit of the standard, tighten the screw on
the side with a lower nip value at the edge.
MEMO:
A 1/2 turn of the screw shifts the nip balance by about
0.4 mm.
A 1/2 turn on the screw at the front will increase the
0000-5064
c
1.5mm
Standard:
8.75mm±0.25mm
(less than
b
5000 sheets)
Center
of paper
9.25mm±0.25mm
(5000 sheets
or more)
1.5mm
nip at the front by 0.3 mm, decreasing the nip at the
rear by 0.2 mm.
If the median value of the measured nip is toward the
higher limit of the standard, tighten the screw on the
side with a higher nip value at the edge.
If the nip needs adjustment while the nip balance is
correct, the adjusting screw both at the front and rear
may be given a 1/2 turn so that the nip may change by
about 0.3 mm.
F-11-163
Service Mode
COPIER>FUNCTION>FIXING>NIP-CHK
Use it to generate output for fixing nip width auto
measurement.
Chapter 11
11-49