Canon LBP-1760, Service Manual

Page: 196 / 394

VII. MEASUREMENT AND ADJUSTMENT
A. Mechanical Adjustment
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-52 cartridge, and take the print to the cus-
tomer’s site.
2) Place the all-black print in the cassette of the printer, with the printed side facing down.
3) Select face-up delivery.
4) Press the test print switch.
5) When the leading edge of the print emerges at the face-up tray, turn OFF the printer. Open
the top cover and 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 require-
ments as shown in Figure 4-7-1.;
• Center (a): 6mm to 8.1mm
• Right and left (b, c): 6.3mm to 8.3mm
• Difference between right side and left side (|b-c|): 1.0mm or less
• Difference between right/left sides and center (b-a, c-a): -0.3mm or more
Figure 4-7-1
4 - 34
CHAPTER 4
c
b
a
15mm
15mm
Feed-out direction
Center of
paper