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CHAPTER 10 TROUBLESHOOTING
COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
10–26
4. Checking the Charging Assembly
a. Check each charging assembly for soiling and a fault on its charging wire (scratches).
b. Clean the charging wire and shield plate of each charging assembly. (If dirt cannot be
removed, replace it.)
c. Check the height of each charging wire.
d. Check to make sure that each charging wire is not rusted.
f. Check to make sure that the anti-vibration rubber (of each charging assembly) is not
displaced.
5. Checking the Developing Assembly
a. Check to make sure that the rollers on both ends of the developing assembly are in contact
with the drum.
b. Check to make sure that the surface of the developing cylinder is coated with an even layer of
toner.
6. Checking the Paper
a. Check if the paper is of a type recommended by Canon.
b. Check if the paper is not moist.
Try using paper fresh out of package.
7. Checking the Periodically Replaced Parts
Replace those parts that have reached their service life as indicated in the Scheduled
Servicing Chart and the Periodically Replaced Parts Table.
8. Others
Keep in mind that bringing in a copier from a cold to warm room, as during installation in
winter, can cause condensation in its inside, causing various problems.
a. Condensation on the scanning system (glass, mirror, lens, etc.) can cause light images.
b. Condensation in the charging system can cause electric leakage.
c. Condensation on the pick-up/feeding guide plate can cause faulty feeding.
If condensation is noted, dry wipe the part or leave the copier powered for about one hour.
Caution:
If a discrepancy in density (between separation side and rear), light image, of fogging
occurs, try to correct the problem by following the “Image Adjustment Basic Procedure.”