Initial Check; Basic Procedure; Introduction - Canon LBP-CX Series Service Manual

I. INTRODUCTION
A. Initial Check
1. Check the operating environment.
a. Line voltage should not vary more than 10% from
the rated value.
b. The printer must be installed on a solid, level
surface.
c. Room temperature must be kept between 10°
and 32.5°C (50° - 90°F). Relative humidity
should be between 20% and 80%.
d. The printer should not be located in hot or humid
areas (near water taps, boilers, or humidifiers), nor
in a cold place, near open flames, or in a dusty
location.
e. Make sure that the printer is never exposed to
ammonia gas, which is produced by diazo copiers
or by office cleaning. Stress the importance of this
to the customer.
f. The printer should not be exposed to direct sun-
light. If it has to be located in a sunny place, the
customer must install protective curtains over the
window.
g. Install the printer in a well-ventilated area.
2. Check the corona assemblies
a. The primary corona assembly in the EP cartridge
and the transfer corona assembly must be clean
and undamaged. (Replace them
if
they can not be
cleaned or are damaged.)
b. Check the height of the transfer corona wire.
c. Make sure the transfer corona assembly is securely
seated in its socket.
d. Check that the transfer corona spring is not rust-
ed. (If rusted, replace the spring.)
3. Check the print paper.
a. Is manufacturer-approved paper used? If extremely
thick paper or thin paper, or paper that tends to
curl, is used, paper may jam, transfer may be poor,
or the image may be blurred.
b. Has the print paper absorbed moisture? (Take
paper from a newly opened package, make prints
with it, and observe whether print quality im-
proves.)
4. Check consumables
Check the color of the indicator on the EP
cartridge. If it is red, replace the cartridge (about
3,000 prints standard).
If blank areas occur in the image, toner may have
accumulated at one side of the cartridge. Remove the
cartridge and rock it side to side to distribute the
toner within, then make a sample print and check
print quality.
5. Several more items should be checked before
troubleshooting.
a. Make sure that the transfer guide and the feeder
guide are clean. If they are dirty, clean them with
a damp cloth.
b. Check whether the fixing roller cleaner felt is too
dirty to clean the roller anymore.
6. Other items
During the winter, if the printer is taken from
a cold room into a warm room, condensation will
form inside the printer and cause various problems.
Examples
Condensation on the optical surfaces (lens, glass,
mirrors, etc.) will cause the image to lighten.
If the drum is cold, the electrical resistance of the
photosensitive layer is high, and correct contrast in
prints will not be obtained.
Condensation on the corona assembly will result in
corona leakage.
Moist paper or condensation on the manual feed
guide or manual pickup rollers may cause poor
paper feed. If condensation is noticed on compo-
nents, wipe them gently with a clean dry cloth or
plug in the printer and leave it for 10 - 20
minutes.
If the aluminum bag protecting the cartridge is
opened in a warm room just after being stored in
the cold, moisture will condense inside the car-
tridge and could cause image trouble. Be sure to
instruct the customer to allow the package to
come to room temperature before he opens it, if it
has been stored in the cold. This takes one to two
hours.
B. Basic Procedure
When a malfunction or image defect is reported,
follow the basic procedure below after performing
the initial check.
1. Use the printer driver and laser driver checker
(RY9-0002) to determine whether the problem
lies with the printer or the external device.
2. If the printed image is at fault, locate the problem
on the chart of image defects on page 7-.13, then
go to the appropriate table.
COPYRIGHT
©
BY CAllOll lllC. CANON LBP·CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ
7-1