Canon CLC5000 - The Copy Has Uneven Density (Horizontal)

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON CLC5000 REV.0 JAN 2001
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
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3.4.4 The copy has uneven density (horizontal).
1) Clean the primary charging assembly, dust-proofing glass, reflect-
ing mirror, and lens. Is the problem corrected?
YES: End.
2) Is the output image of the halftone print (PGYTPE=5) normal?
YES: Go to step 11.
Moire
3) Is the image uneven because of moire*?
* Pattern interference that occurs when copying originals printed
in dots.
YES: Decrease ‘Photo Sharpness’, and store the setting in standard
mode.
• If excessively decreased, copies of photos will have little contrast.
Service mode (CCD)
4) Are the settings of ‘CCD’ as indicated on the service label?
NO: Enter the correct settings.
5) Execute ‘FUNC > CCD > AUTO-ADJ’ in service mode. Is the prob-
lem corrected?
NO: Replace the image processor or the analog processor.
Transfer/static eliminating system
6) • Is the transfer blade locking mechanism of the transfer unit nor-
mal?
• Are there scratches or a fault on the transfer blade?
• Operate the transfer blade using ‘BLADE’ under ‘FUNC’ in ser-
vice mode to check the locking of the transfer blade. At this time, is
the transfer blade subject to warping or other fault?
YES: Check the transfer blade locking mechanism; if normal, replace the
transfer blade.
Fixing unit
7) Are there scratches or dents in the peripheral direction of the fixing
roller (upper, lower)?
YES: Replace the fixing roller.
8) Is there a fault on the fixing oil applying roller, oil hose, oil tank, oil
pump driver solenoid or oil removing blade?
YES: Remove the cause of the fault, and replace the part.