COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
13-69
CHAPTER 13 TROUBLESHOOTING
2
The copy has uneven density (vertical).
Cause
------------
------------
Moire
Scanner
Service mode
Developing
assembly
Grid plate
(primary charging
assembly)
Pre-exposure
lamp
Action
End.
Go to step 12.
Reduce the degree of
sharpness (photo), and
store the new setting as
part of standard mode.
· Keep in mind that too
low a setting will
reduce the contrast of
copies of photos.
End.
Mount the part properly.
Replace the part.
Enter the settings once
again.
Try replacing the image
processor, analog
processor, and the like.
Check the developing
assembly and
developing cylinder for
which uneven density is
noted. If a fault is found,
clean or replace the part.
Correct the grid plate.
Check the connection of
J1008 on the DC driver
PCB and check the
wiring from J1008 to the
pre-exposure lamp PCB;
if normal, replace the
pre-exposure lamp PCB.
Go to step 9.
Step
1
2
3
4
5
6
7
8
9
10
11
12
Yes/No
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Checks
Clean the primary charging
assembly, dust-proofing glass,
reflecting mirror, and lens. Is the
problem corrected?
Is the output of the halftone test
print (TYPE=5) normal for all
colors?
Is the uneven density caused by
moire patterns?
· A "moire" pattern refers to lines
of interference occurring when
making a copy of an original
consisting of dots.
Clean the standard white plate,
scanning lamp, and reflecting plate.
Is the problem corrected?
Is the standard white plate or the
copyboard glass off its base?
Has the original scanning lamp
blackened?
Are the settings of 'CCD' in service
mode the same as those recorded
on the service label?
Execute FUNCTION>CCD>CCD-
ADJ. Is the problem corrected?
Is uneven density noted for all
colors?
Is the grid plate of the primary
charging wire normal?
Does the pre-exposure lamp turn
on during copying operation?
Is the uneven density noted at the
same position for all colors of the
output image of the halftone test
print (TYPE=5)?
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