Canon FAX L1000 Service Manual page 325

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.
NOTE
Follow the procedures below to check the nip width:
(1) Either take along one or two all-black copies of A4 or letter size made
with a copier, or make it using a copier at the customer site.
(2) Place the all-black copy in the cassette of the printer, with the printed
side facing down.
(3) Open the face-up tray.
(4) Press the test print switch (SW501) on the ECNT board.
(5) When the leading edge of the print emerges at the face-up tray, turn
OFF the printer. Take out the print from the printer about 10 seconds
later.
(6) Measure the width of the glossy band across the paper and check that it
meets the requirements as shown in below table.
Paper feed direction
FAX-L1000 Chapter 4: Maintenance and Service
c
a
b
Dimension
a 6 to 8 mm
b 6.3 to 8.3 mm
c 6.3 to 8.3 mm
b - c 1.0 mm or less
b - a –0.3 mm or more
c - a –0.3 mm or more
Figure 4-47 Fixing Nip Width
4-73
15mm
Center of
paper
15mm