Canon CP660 Service Manual page 376

CHAPTER 10 TROUBLESHOOTING
1. Full-color 16 gradations (YMCK)
Use the full-color 16-gradation (YMCK) test print to check the gray balance, gradation
of each color (YMCK), and fogging.
Note:
· The page consists of patches of Bk, Y, RGB, M, and C.
· Cassette 2 is used as the source of paper.
· The page consists of a single sheet.
· Regardless of the size of paper, the patches are printed at the center.
a. Gray Balance
Check to find out if the gray scale is even for all colors.
b. Gradation
Check the gradation and the difference in density of each color (YMCK).
c. Fogging
If the white area is foggy, the photosensitive drum inside the drum cartridge or the
laser system of the printer unit is likely to be faulty.
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COPYRIGHT © 1999 CANON INC.
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Figure 10-701
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)