Canon NP6330 Service Manual page 403

CHAPTER 11 TROUBLESHOOTING
9 The copy has black lines. (vertical, thin)
Cause
Step
1
Lower transfer 2
guide
Photosensitive 3
drum
Developing
assembly,
exposure
system
Fixing assembly 4
11-62
Checks
Press the Copy Start key, and turn
off the power switch while the
copy paper is in the feeding
assembly. Does the copy image
before the paper goes through the
fixing assembly have black lines?
Is the lower transfer guide soiled?
Are there scratches or black lines
in the peripheral direction of the
surface of the photosensitive
drum?
Remove the black lines off the
surface of the photosensitive drum
with a dry flannel cloth coated with
toner. Is the problem corrected?
Are there scratches or black line
in the peripheral direction of the
surface of the upper fixing roller?
COPYRIGHT © 1997 CANON INC.
YES/NO
YES
YES
YES
NO
YES
NO
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Go to step 4.
Clean it.
If scratches are found on
the drum, replace the
drum unit.
If scratches or black
lines are found, be sure
to find out the cause.
Check the developing
system and the
exposure system.
1. Replace the upper
roller.
2. Check to find out if
the cleaning belt is
taken up properly.
3. Check and clean the
separation claws.
Check the fixing
assembly inlet for dirt.