Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 334 / 987

NOTE:
Various settings can be configured in the following service mode.
Output of each developing color
COPIER > TEST > PG > COLOR-Y
COPIER > TEST > PG > COLOR-M
COPIER > TEST > PG > COLOR-C
COPIER > TEST > PG > COLOR-K
Print density setting
TEST>PG>DENS-Y
TEST>PG>DENS-M
TEST>PG>DENS-C
TEST>PG>DENS-K
Check item Checking method Assumed cause
Transfer failure Check the entire image for any transfer failure. ITB error (scratches or soiling)
Primary Transfer Roller error (scratches or soiling)
Secondary Transfer Roller error (scratches or soiling)
Black line (colored
line) Check the entire image for any black line. Damage to the Drum Unit
White line Check the entire image for any white line. ITB Unit error
Secondary Transfer Outer Roller error
Soiling on the laser light path
Uneven density at reg-
ular intervals Check the entire image for any uneven density at reg-
ular intervals. Drum Unit error
Uneven density Check the entire image for any uneven density. Soiling on the Dustproof Glass
Deterioration of the ITB
■ Grid (TYPE=6)
This test print is mainly used to check color displacement, right angle accuracy, and linearity.
Check item Checking Method Assumed cause
Color displacement Check that there is no displacement between the lines
of the respective colors. Laser Scanner Unit error
ITB Unit error
Soiling on the Registration Sensor
Secondary Transfer Roller error
Main Drive Unit (drum rotation) error
Right angle accuracy and
linearity Check that there is nothing wrong with the right angle
accuracy and linearity between the lines of the respec-
tive colors. Laser Scanner Unit error
Registration Roller error
Secondary Transfer Outer Roller error
6. Troubleshooting
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