III. TROUBLESHOOTING FAULTY IMAGES
A. Making Initial Checks
1. Environment of the Site
Check the site to see if it satisfies the following:
a. The voltage of the power supply is as rated (± 10%).
b. It is not in a high temperature or high humidity environment (especially near a water faucet,
water boiler, humidifier), and it is not too cold. It is not near a source of fire, and it is not subject
c. It is not subject to ammonium gas.
d. It is not exposed to direct sunlight. Otherwise, provide curtains.
e. It is well ventilated.
It will support the copier level.
2. Checking the Originals against Symptoms
Identify the problem for its cause, i.e., whether it is caused by an original or the copier.
a. Checking the Density of the Original
A diazo copy used as an original or an original with high transparency tend to produce copies
which tend to be mistaken for "foggy" copies.
An original prepared in light pencil tends to produce copies which are likely to be mistaken for
3. Checking the Copyboard Cover, Copyboard Glass, and Standard White Plate
If any of these parts is soiled, clean it with a moist cloth. If scratches are found, replace it.
4. Checking the Charging Assemblies
a. Check each charging assembly for dirt and a fault in its charging wire/charging brush
b. Clean the charging wire, grid wire, and shielding plate of each charging assembly. (Dry wipe
the part with lint-free paper; then, clean it with alcohol. If dirt cannot be removed, replace it.)
c. Check the height of each charging wire.
d. Check to see each charging assembly is properly set.
e. Check the charging spring (especially of the separation charging assembly) for rusting.
5. Checking the Developing Assembly
a. Check to make sure that the rolls on both ends of the developing assembly are in contact with
the photosensitive drum.
b. Check to make sure that the surface of the developing cylinder is coated with a uniform layer of
COPYRIGHT © 1999 CANON INC.
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING