Checking The Nip Width Of The Pressure Roller - Canon PC-D320 Service Manual

3. ADJUSTMENT

3.1 Checking the Nip Width of the Pressure Roller

The fixing unit is not designed to allow adjustment of the pressure (nip width); however, the
incorrect nip width can cause fixing problems.
Follow the procedures below to check the nip width:
(1) Make an all-black print of A4 size using an EP cartridge,and bring the print to the cus-
tomer's site.
(2) Place the all-black print in the multi-purpose tray of the printer,with the printed side
facing down.
(3) Select face-up delivery by shifting the delivery switching lever downward.
(4) Press the test print switch.
(5) Turn OFF the printer when the leading edge of the print emerges at the face-up
tray. Openthe rear cartridge cover and take out the print about 60 seconds later.
(6) Measure the width of the glossy band across the paper and check that it meets the
require-ments as shown in Figure 4-3.
Center (a):6.0 mm to 7.6 mm
Right and left:6.0 mm to 7.6 mm
Difference between right side and left side (|b-c|):1.0 mm or less
Difference between right/left side and center (b-a,c-a):1.0 mm or less
PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service
Paper feed
direction
Figure 4-3 Fixing Nip Width
4-7
c
Center of A4
size paper.
a
b