The Copy Has White Streaks/ White Lines (Vertical) - Canon 1000 Service Manual

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
7 The copy has white streaks/
white lines (vertical).
Cause Step
Developing
assembly
Laser optical
path
Photosensitive
drum
Cleaner lubricant
7-72
COPYRIGHT © 2001 CANON INC.
Checks
1 Generate a halftone test print
(PGTYPE=5). Are there vertical
white streaks/white lines?
If in all colors, go to step 8.
If in a specific color, go to the next
step.
2 Check the cylinder of the developing
assembly for which white streaks/
white lines are noted. Are there white
streaks or other fault?
3 Clean the dust-proofing glass of the
laser exposure system. Is the prob-
lem corrected?
4 Clean the lens with a blower brush.
Is the problem corrected?
5 Are there scratches in the peripheral
direction of the photosensitive drum?
6 Does the problem occur during
installation of the machine or re-
placement of the photosensitive
drum?
Yes/No
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
NO Go to step 15.
YES Check the inside of the
developing assembly for
foreign matter.
YES End.
YES End.
YES Clean the photosensitive
drum with a cloth coated
with toner; if the scratches
are not eliminated, re-
place the photosensitive
drum.
YES Suspect uneven cleaner
lubricant. See the notes
on using the cleaner
lubricant.