The Copy Has Fogging; The Copy Has Vertical Streaks/ Vertical Lines - Canon 1000 Service Manual

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
5

The copy has fogging.

Perform the Image Adjustment Basic Procedure.
6 The copy has vertical streaks/
vertical lines.
Cause Step
Primary charging
assembly
cleaner
Primary charging
wire, Pre-primary
charging wire
Grid plate
Photosensitive
drum
7-68
COPYRIGHT © 2001 CANON INC.
Checks
1 Generate a halftone test print
(PGTYPE=5). Are vertical streaks/
vertical lines noted?
If the problem is noted in all colors,
go to step 13.
If the problem is noted in a specific
color, go to the next step.
2 Does the cleaner of the primary
charging assembly stop in the
middle?
3 Clean the primary charging wire and
the pre-primary charging wire. Is the
problem corrected?
4 Are there scratches or dirt on the grid
plate?
5 Are there scratches in the peripheral
direction 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 16.
NO Check the motor of the
cleaner.
YES End.
YES Replace the grid plate.
YES Replace the photosensi-
tive drum. If scratches are
found, remove the cause.
Further, keep in mind that
scratches on the photo-
sensitive drum can
damage the cleaning
blade; if such is the case,
replace the cleaning
blade also.