The Copy Has White Streaks/ White Lines (Vertical) - Canon CLC5000 Service Manual

3.4.7 The copy has white streaks/white lines (vertical : the sub scanning direction).
1) Generate a halftone test print (PGTYPE=5). Are there vertical
NO:
Developing assembly
2) Check the cylinder of the developing assembly for which white
YES: Check the inside of the developing assembly for foreign matter.
Laser optical path
3) Clean the dust-proofing glass of the laser exposure system. Is the
YES: End.
4) Clean the lens with a blower brush. Is the problem corrected?
YES: End.
Photosensitive drum
5) Are there scratches in the peripheral direction of the photosensitive
YES: Clean the photosensitive drum with a cloth coated with toner; if the
Fixing unit
6) Clean the fixing assembly inlet guide (upper, lower). Is the problem
YES: End.
7) Are there scratches or dents in the axial direction of the fixing
YES: Remove the cause of the scratches, and replace the fixing roller.
8) Is there a fault in the take-up mechanism of the web and cleaning
YES: Remove the cause of the fault, and replace the part.
9) Check the fixing assembly separation claw or the separation guide
YES: Clean or replace it.
10) Are there scratches or dents on the oil removing blade?
YES: Clean or replace it.
Cleaner lubricant
11) Does the problem occur during installation of the machine or re-
YES: Suspect uneven cleaner lubricant. See the notes on using the
COPYRIGHT © 2001 CANON INC.
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
white streaks/white lines?
If in all colors, go to step 11.
If in a specific color, go to the next step.
Go to step 13.
streaks/white lines are noted. Are there white streaks or other fault?
problem corrected?
drum?
scratches are not eliminated, replace the photosensitive drum.
corrected?
roller (upper, lower)?
operation?
for an error.
placement of the photosensitive drum?
cleaner lubricant.
2000 2000 2000 2000 CANON CLC5000 REV.0 JAN 2001
5-87