The Copy Has Uneven Density (Horizontal) - Canon 1000 Service Manual

4 The copy has uneven density
(horizontal).
Cause Step
Moire
Service mode
(CCD)
Transfer/static
eliminating
system
Fixing unit
COPYRIGHT © 2001 CANON INC.
Checks
1 Clean the primary charging assem-
bly, dust-proofing glass, reflecting
mirror, and lens. Is the problem
corrected?
2 Is the output image of the halftone
print (PGYTPE=5) normal?
3 Is the image uneven because of
moire*?
* Pattern interference that occurs
when copying originals printed in
dots.
4 Are the settings of 'CCD' as indicated
on the service label?
5 Execute 'AUTO-ADJ' of 'CCD' under
'FUNC' in service mode. Is the
problem corrected?
6 • Is the transfer blade locking
mechanism of the transfer unit
normal?
• Are there scratches or a fault on
the transfer blade?
• Operate the transfer blade using
'BLADE' under 'FUNC' in service
mode to check the locking of the
transfer blade. At this time, is the
transfer blade subject to warping
or other fault?
7 Are there scratches or dents in the
peripheral direction of the fixing roller
(upper, lower)?
8 Is there a fault on the fixing oil
applying roller, oil hose, oil tank, oil
supply solenoid or oil removing
blade?
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Yes/No
YES
NO
YES
NO
NO
YES
YES
YES
Action
End.
Go to step 6.
Decrease 'Photo Sharp-
ness', and store the
setting in standard mode.
• If excessively de-
creased, copies of
photos will have little
contrast.
Enter the correct settings.
Replace the image
processor or the analog
processor.
Check the transfer blade
locking mechanism; if
normal, replace the
transfer blade.
Replace the fixing roller.
Remove the cause of the
fault, and replace the part.
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