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COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10–35
12.The copy has white spots. (vertical)
Developing
assembly
Photosensitive drum
Copy paper
Scanner rail,
Scanner cable
Charging wire
1
2
3
4
Is the problem noted at intervals of
about 3.2 cm? (scratch on the
developing cylinder)
Is the problem noted at intervals of
about 9.4 cm? (scratch on the
photosensitive drum)
Try copy paper fresh out of package.
Is the problem corrected?
Is the problem noted at the same
location on all copies?
1.Clean the developing roller.
2.Clean the surface of the developing
cylinder.
3.If scratches are found on the
surface of the developing cylinder,
replace the developing cylinder or
the developing assembly.
1.Clean the photosensitive drum.
2.If the scratches are found on the
photosensitive drum, replace the
drum unit.
The copy paper is moist. Instruct the
user on the correct method of storing
copy paper.
1.Check the scanner rail for a foreign
object.
2.Adjust the tension of the scanner
cable.
Clean each charging wire.
ActionsCause
Checks
YES
YES
YES
YES
NO
Step
Yes/No