7-80
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
13
The copy has a soiled image or soiled back.
12
The copy has white spots (meandering).
Action
End.
Remove the fault.
Replace the environment
sensor.
Check the separation
charging wire, signal line
of the pre-fixing charging
system, and wiring.
Cause
Separation
charging wire
Separation
charging assem-
bly
Environment
sensor
Step
1
2
3
Checks
Clean the separation charging wire.
Is the problem corrected?
Is leakage, poor contact, or wrong
charging wire height noted for the
separation charging assembly?
Check the machine inside tempera-
ture using ‘ANALOG’ under ‘DISP’ in
service mode. Is the reading proper?
Yes/No
YES
YES
YES
NO
Cause
Image margin
Primary charging
assembly,
Developing bias
laser power
Cleaning fault
Step
1
2
3
4
5
6
7
8
Checks
Is a soiled image noted only on a copy
made after making a two-sided copy?
Is the image margin within specifica-
tion?
Is fogging noted in the image mar-
gin?
Is the cleaning blade of the photo-
sensitive drum locked?
Is foreign matter found on the clean-
ing blade of the photosensitive drum
cleaning assembly?
Is deformation or scratches noted on
the edge of the cleaning blade?
Feel the cleaning blade with a finger to
check for deformation and scratches.
Is there a collection of waste toner
under the scoop-up sheet?
Is the scoop-up sheet of the photosensi-
tive drum cleaning blade bent or faulty?
Yes/No
YES
NO
YES
NO
YES
YES
YES
YES
Action
Go to step 10.
Make adjustments as
instructed under 2. “Stand-
ards and Adjustments.”
Check the primary charg-
ing assembly for dirt, and
check the developing bias
and laser power.
Lock and fix in position
the cleaning blade of the
cleaning assembly.
Remove the foreign matter,
and clean the cleaning
blade and the cleaner
assembly externals.
If deformation or scratches
are noted, remove the
cause, and replace the
cleaning blade.
Clean it.
Replace the scoop-up
sheet.
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