Canon imageRUNNER ADVANCE C3330 Series Service Manual page 417

■ MCYBk horizontal stripe (TYPE=10)
This test print is for mainly checking the dark area density of each color, each color balance and white line on development.
Check items
Uneven density Check that uneven density does not appear on solid area of each
color
Black line (color line) Check that black line (color line) does not appear on solid area of
each color
White line Check that white line does not appear on solid area of each color Failure of ITB Unit
■ 64-gradations (TYPE=12)
This test print is for mainly checking the gradations of YMCBk single color at one time.
Check item
Gradation Check that 64 gradations density is properly reproduced.
Fogging Check that fogging appears on white image area only.
White line Check that there is no white line on entire image.
Check method
Check method
405
6. Troubleshooting
Assumed cause
Failure of Laser Scanner Unit
Failure of developer in Drum Unit
Failure of Primary Transfer Roller
Scratch on Photosensitive Drum
Dirt on Primary Charging Roller
Failure of Secondary Transfer Outer Roller
Dirt on Laser Light Path
Assumed cause
Failure of Drum Unit
Failure of Laser Scanner Unit
Failure of Drum Unit
Failure of Laser Scanner Unit
Failure of Drum Unit