Canon imageRUNNER ADVANCE 715iF III Series Service Manual page 261

Check item
Right angle accura- Check whether lines in the horizontal/vertical scanning directions
cy/Straight line accu- are paralleled to the paper and these lines are at right angles to
racy one another.
Side registration Check the left margin.
Magnification ratio Check whether the grid is printed at 9.99mm intervals. (Check
the image on the second side at duplex printing.)
■ 17 gradations (TYPE=2/3)
Check item
Gradation Check whether gradation in density is made appropriately.
Black line Check whether black lines appear on the image.
White line Check whether white lines appear on the image.
■ Solid white (TYPE=4)
Check item
Fogging Check whether foggy image appears in the blank area.
Check method
Check method
Check method
250
Assumed cause
Feed system failure or Laser Scanner Unitfai-
lure is considered.
Floor at the installation site is extremely distor-
ted, or the feed system failure is considered.
Rollers' feed system failure or laser exposure
system failure (drum, Laser Scanner) is con-
sidered.
Assumed cause
Drum failure, laser exposure system failureor developing
system failure is considered.
Laser light path failure, developing system failure, cleaning
(drum) failure or transfer roller failure is considered.
Developing system failure is considered.
Assumed cause
Drum failure, laser exposure system failureor developing
system failure is considered.
6. Troubleshooting