Canon LBP3250 Series, Service Manual, Page: 73 / 98

Chapter 5
5-1
5.1 MEASUREMENT AND ADJUSTMENT
5.1.1 Test Print
5.1.1.1 Test Print Function
0019-9550
This equipment has a test print function to check if the printer engine nor-
mally operates.
Test patterns (horizontal lines) are output when executing this test print.
The following is the operation procedure;
1) Set A4/LTR papers on the pickup tray or the manual feed pickup tray.
2ÅjOpen and close the delivery tray [1] five times continuously with the
power switch on. (The time of opening and closing the delivery tray is ap-
prox. 2 sec or less.)
3) Test print is executed.
In this test print, pickup from the manual feed tray is executed prior to that
from the pickup tray.
F-5-1
5.1.2 Mechanical Adjustment
5.1.2.1 Checking the Pressure of the Pressure Roller
(nip)
0019-9551
The nip width of the fixing unit is not adjustable in this printer, however, the
incorrect nip width may cause the faulty fixing.
Follow the procedures below to check the nip width.
1) Prepare an all-black print of A4 size made by the same type of EP Toner
cartridge for this printer before visiting the customer site.
2) Place a solid black paper on a manual pickup tray with the printed side fac-
ing down.
3) Open the face-up cover to perform the face-up delivery.
4) Press the test print switch.
5) Turn OFF the printer switch as soon as the leading edge of the paper ap-
pears in the exit of the paper delivery unit. Wait for 10 seconds after the
printer-OFF, and then take the paper out from the printer.
6) Measure the width of the glossy band across the paper and check if it is
meeting the requirements below.
- Center (a): 5.5mm to 8.1mm
- Right and left (b, c): 5.5mm to 8.1mm
F-5-2
[1]
Feed out direction
c
a
b
Center
of
A4-sized
paper