How To Use The Test Print - Canon imageRUNNER ADVANCE C5255 Series Service Manual

How to use the test print

■ 16 gradations (TYPE=4)
■ Full half tone (TYPE=5)
6
Troubleshooting > Test Print > How to use the test print > Full half tone (TYPE=5)
This test print is for mainly checking the gradation, fogging, white line and uneven density at front & rear.
Check item
Gradation
Fogging
White line
Uneven density at
front & rear
F-6-1
This test print is for mainly checking the black line, white line and uneven density.
MEMO:
1. Select: service mode > COPIER > TEST > PG and specify developing color "COLOR-Y/M/C/K" to output the print by
developing color.
2. To change the density of test print, select: service mode > TEST > PG > DENS-Y/M/C/K and set the density.
Check item
Transfer failure
Black line
(color line)
White line
F-6-2
Uneven pitch
Uneven density
6 Troubleshooting > Test Print > How to use the test print > Full half tone (TYPE=5)
Check method
Check that 16 density gradation is properly reproduced.
Check that fogging occurs on white image area only.
Check that white line does not appear on entire image.
Check that uneven density does not appear at front & rear.
Check method
Check that the transfer failure does not appear on entire image. Failure of ITB (scratch, dirt)
Check that black line does not appear on entire image.
Check that white line does not appear on entire image.
Check that uneven pitch does not appear on entire image.
Check that uneven density does not appear on entire image.
Assumed cause
Failure of Drum Unit (end of life)
Failure of Laser Scanner Unit
Failure of Drum Unit (end of life)
Failure of Laser Scanner Unit
Failure of Developing Assembly
Failure of Photosensitive Drum (approx. 94mm)
Failure of Developing Cylinder (approx. 63mm)
Assumed cause
Failure of Primary Transfer Roller (scratch, dirt)
Failure of Secondary Transfer Roller (scratch, dirt)
Scratch on Photosensitive Drum
Dirt on Primary Charging Roller
Failure of ITB Unit
Failure of Secondary Transfer Outer Roller
Dirt on laser light path
Failure of Photosensitive Drum (approx. 94mm)
Failure of Developing Cylinder (approx. 94mm)
Dirt on Dustproof Glass
Deterioration of ITB
6-4
T-6-3
T-6-4
6-4