Canon CP660 Service Manual page 378

CHAPTER 10 TROUBLESHOOTING
3. Full face halftone (Y, M, C, K)
Use the halftone test print to check transfer faults, black lines, white lines, and uneven
intervals.
Note:
· The page consists of halftone solids of C, M, Y, and Bk.
· Cassette 2 is used as the source of paper.
· The page consists of a total of 4 sheets, one each for C, M, Y, and Bk.
· Halftone solids are printed within the entire printable area (guaranteed area).
a. Transfer Faults
If transfer faults occur, the intermediate transfer drum unit or the secondary transfer
belt assembly of the printer unit is likely to be faulty.
b. Black Lines
If black lines occur, the photosensitive drum inside the drum cartridge of the printer
unit is likely to have scratches or the primary charging roller is likely to be solid.
c. White Lines
If white lines occur at the same position in all colors, the intermediate transfer drum or the
secondary belt assemble of the printer nit is likely to be faulty. If they occur at different
positions or in one color, the toner cartridge of the printer unit is likelty to be faulty.
d. Uneven Intervals
If uneven intervals occur, suspect the following:
· if at 66-mm intervals, the developing cylinder.
· if at about 52-mm intervals, the registration roller.
10-96
COPYRIGHT © 1999 CANON INC.
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Figure 10-703
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)