Canon CP660 Service Manual page 304

CHAPTER 10 TROUBLESHOOTING
6 The print has vertical bands/lines (sub scanning direction).
Cause Step
Photosensitive 1
drum
Upper fixing 2
roller
7 The print has white bands/lines (vertical; sub scanning direction).
Cause Step
1
Fixing/separa- 2
tion upper
guide
Photosensitive 3
drum unit
Laser optical 4
path
Printer unit 5
laser
scanner/scan-
ner assembly
Intermediate 6
transfer drum
unit
Upper fixing 7
roller
10-22
COPYRIGHT © 1999 CANON INC.
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Checks
Are there scratches in the peripheral
direction (sub scanning direction) of
the photosensitive drum?
Are there scratches in the peripheral
direction (sub scanning direction) of
the upper fixing roller?
Checks
Make a vertical stripe test print
(TYPE=10). Do the white
bands/lines occur in a specific color
only?
Is the fixing/separation upper guide
coated with toner?
Are there scratches in the peripheral
direction (sub scanning direction) of
the photosensitive drum?
Is the laser emission opening of the
printer unit coated with foreign mat-
ter?
Is any of the mirrors of the
laser/scanner assembly soiled?
Are there scratches in the peripheral
direction (sub scanning direction) of
the intermediate transfer drum?
Are there scratches in the vertical
direction (sub scanning direction) of
the upper fixing roller?
Yes/No
YES
YES
Yes/No
YES
YES
YES
YES
YES
YES
YES
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Replace the photosen-
sitive drum cartridge.
Replace the upper fix-
ing roller.
Action
Replace the toner car-
tridge of the color.
Clean the fixing/sepa-
ration upper guide.
Replace the photosen-
sitive drum cartridge.
Remove the foreign
matter.
Replace the laser/scan-
ner assembly.
Replace the intermedi-
ate transfer drum unit.
Replace the upper fix-
ing roller.