Canon LBP3300 Series, Service Manual

Page: 61 / 97

Chapter 5
5-1
5.1 MEASUREMENT AND ADJUSTMENT
5.1.1 Test Print
5.1.1.1 Test Print
0011-5471
This test print is conducted in order to check if the printer engine works nor-
mally.
When this test printing is made, the test print pattern (horizontal lines) is
printed as shown below.
While the printer is in STBY period press the test print switch located on the
left side of the printer once and one page of engine test pattern is printed. The
test pattern can be printed continuously if the switch is held down.
Accessing the Test Print Switch
1) Detach the left cover[1].
- 3 claws [2]
F-5-1
2) Unscrew two screws [1] of the rear cover.
F-5-2
3) Remove the sheet metal [1].
- 10 screws [2]
F-5-3
4) Remove 5 screws [1] and the connector [2], and slide the video controller
PCB [3] to the upper side.
F-5-4
5) Insert a tool such as a driver into the guide hole [1] and press the Test Print
switch.
F-5-5
5.1.2 Mechanical Adjustment
5.1.2.1 Checking the Nip Width (fixing pressure roller)
0011-5461
The nip width of the fixing unit is not adjustable in this printer, however, the
incorrect nip widthmay cause the faulty fixing.
Follow the procedures below to check the nip width.
1) Make a solid black print of A4 size using an EP cartridge, and take the
print to the customer's site.
2) Place the solid black print, with the printed side facing down, in the
manual feed tray of the printer.
3) Open the face-up cover and perform face-up delivery.
4) Press the test print switch.
5) Turn OFF the printer when the leading edge of the paper is fed to the face-
up delivery tray.
Wait for 10 seconds, and then push down the jam removal lever of the fixing
unit to pull out the paper from the printer
6) Measure the width of the glossy band across the paper and check that it
meets the requirements.
- Center (a): 5.6 mm to 9.0 mm
- Right and left (b, c): 5.6 mm to 9.0 mm (Measure the 10 mm point from
the paper edge)
F-5-6
Feed-out direction
c
a
b
Center of A4-
sized paper