(Pgtype=04) - Canon 1000 Service Manual

4. 17-Gradation Test Print

(PGTYPE=04)

Use the 17-gradation test print to check grada-
tion, fogging, white lines, uneven density between
left and right, and balance between colors.
To select a color, use service mode:
TEST>DENS - Y/M/C/K.
a. Gradation
If the gradation of density is not as shown in
Figure 7-305, suspect a fault in the developing as-
sembly or the laser system.
COPYRIGHT © 2001 CANON INC.
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
Figure 7-305
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
b. Fogging
If fogging is over the section of 00 activation in
Figure 7-305, suspect a fault in the developing sys-
tem or the photosensitive drum; or, the laser may
not be adjusted correctly.
c. White Lines
If white lines are noted on the image, suspect a
fault in the developing assembly.
d. Balance between Colors (3-color copying)
Select 3-color mode to generate a test print to
check the gray balance at each density.
7-59