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COPYRIGHT
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1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10–33
7. The copy is foggy. (vertical)
8. The copy has black lines. (vertical, fuzzy, thick)
Primary charging
assembly
Scanner
Pre-exposure lamp
(LA2)
Developing
assembly
Fixing assembly
1
2
3
4
Clean the primary charging wire, grid
plate, and shielding plate. Is the
problem corrected?
Clean the scanning lamp, reflecting
plate, side reflecting plate, mirror,
lens, and dust-proofing glass. Is the
problem corrected?
Clean the pre-exposure lamp. Is the
problem corrected?
Is the developing cylinder coated
with a uniform layer of toner?
End.
End.
End.
Check and clean the edge of the blade
of the developing assembly.
Check the fixing assembly.
Step Checks ActionsYes/NoCause
YES
YES
YES
NO
YES
9. The copy has black lines. (vertical, thin)
Transfer guide
Photosensitive drum
Developing system,
Exposure system
Fixing assembly
1
2
3
4
Press the Copy Start key, and turn off
the power switch while the copy
paper is in the feeding assembly. At
this time, does the copy image before
it goes through the fixing assembly
have black lines?
Is the transfer guide soiled
(particularly the transfer upper guide)?
Are there scratches or black lines in
the peripheral direction of the surface
of the photosensitive drum?
Are there scratches or black lines in
the peripheral direction of the surface
of the fixing upper roller?
Go to step 4.
Clean the transfer guide.
Replace the drum unit. If scratches
are found, be sure to find out the
cause.
Check the developing system and the
exposure system.
1.Replace the upper roller.
2.Check the separation claw.
Check to make sure that the fixing
assembly inlet is not soiled.
Checks ActionsCause
NO
YES
YES
NO
YES
NO
Yes/NoStep