Troubleshooting Image Faults; The Image Is Too Light (All Colors); The Image Is Too Light (Specific Color); The Copy Has Uneven Density (Vertical) - Canon 1000 Service Manual

D. Troubleshooting Image Faults
1 Too light (all colors)
2 Too light (specific color)
3 Uneven density (vertical)
4 Uneven density (horizontal)
5 Fogging
6 Vertical lines/ horizontal lines
1 The image is too light
(all colors).
2 The image is too light
(specific color).
Perform the Image Adjustment Basic Procedure.
3 The copy has uneven density
(vertical).
Cause Step
Moire
Scanner
COPYRIGHT © 2001 CANON INC.
7 White lines/white lines (vertical)
8 Horizontal lines/horizontal fogging
9 White spots (horizontal)
10 White spots
11 White spots (trailing center)
12 White spots (wavy lines)
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
test print (PGTYPE=5) normal?
3 Is the image uneven because of
moire*?
* Pattern interference that can occur
when copying originals printed in
dots.
4 Clean the standard white plate,
scanning lamp, and reflecting lamp
cover. Is the problem corrected?
5 Is there a gap under the standard
white plate or the copyboard glass?
6 Is the scanning lamp blackened?
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
13
14
15
16
17
18
Yes/No
YES
NO
YES
YES
YES
YES
Soiled image/soiled back
Fixing fault
Toner smear (fixing)
Blank
Solid black
Color displacement
Action
End.
Go to step 9.
Decrease 'Photo Sharp-
ness', and store the
setting in standard mode.
• If excessively
decreased, copies of
photos will have little
contrast.
End.
Install them so that the
part will be in even
contact.
Replace it.
Cont'd
7-65