Canon CP660 Service Manual page 379

4. YMCK vertical stripe
Use the vertical test print to check the dark area density of each color, balance
between colors, and white lines caused during development.
Note:
· The page consists of halftone strips of C, M, Y, and Bk.
· Cassette 2 is used as the source of paper.
· The page consists of a single sheet.
· Strips of C, M, Y, and Bk are printed within the entire printable area (guaranteed area).
a. Dark Area Density of Each Color and Balance between Colors
The density must not be appreciably low (light image).
If the density of one color is low (light image), the light-color toner cartridge is likely
to be faulty.
If the density of all colors is low (light image), primary transfer/secondary transfer is
likely to be faulty.
b. White Lines Caused during Development
If white lines are found in the cyan area of the copy, the cyan toner cartridge is
likely to be faulty.
c. Uneven Density between Left and Right
If the right/left density is uneven for all colors, the drum cartridge, secondary
pre-transfer charging assembly, or secondary transfer belt assembly of the printer
unit is likely to be faulty.
COPYRIGHT © 1999 CANON INC.
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Figure 10-704
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
10-97