Canon imageRUNNER ADVANCE 715iF III Series Service Manual page 263

Check item
Uneven pitch Check whether lines appear on the image in the horizontal
scanning direction.
Uneven densi- Check the density difference between the front and rear
ty(rear/front) sides.
■ Horizontal line (TYPE=8/9/10)
Check item
Black line Check whether black lines appear on the image.
White line Check whether white lines appear on the image.
Uneven pitch Check whether lines appear on the image in the horizontal
scanning direction.
Uneven densi- Check the density difference between the front and rear
ty(rear/front) sides.
Check method
Check method
252
Assumed cause
Drum failure, developing system failure, laser exposure
system failure or drive-related failure is considered.
Drum failure or developing system failure isconsidered.
Assumed cause
Laser light path failure, developing system failure, cleaning
(drum) failure or transfer roller failure is considered.
Developing system failure is considered.
Drum failure, developing system failure, laser exposure
system failure or drive-related failure is considered.
Drum failure or developing system failure isconsidered.
6. Troubleshooting