Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 63 / 987

■ Parts Configuration
● Major Parts
ITB Unit
Y
M
C
Bk
Bk
C
M
Y
Hopper Unit
Toner Container
Drum Unit
Laser Scanner Unit
■ Print Process
Pickup
Registration
6.Separation
3.Development
7.Fixing
Delivery
5.Secondary transfer
1.Primary charging
4.Primary
transfer
4.Primary
transfer
4.Primary
transfer
4.Primary
transfer
2.Laser exposure
8.ITB cleaning
9.Drum cleaning
Developing block
Static latent image
formation block
Drum cleaning block
Transfer block
Fixing block
Bk
Photosensitive
Drum
C
Photosensitive
Drum
M
Photosensitive
Drum
ITB cleaning block
ITB
Rotating direction of ITB,
photosensitive drum
Flow of print paper
Y
Photosensitive
Drum
No. Block name Process name Description
1 Static latent image forma-
tion block Primary charging The surface of the Photosensitive Drum is charged to make a uniform neg-
ative potential.
2 Laser exposure Emission of the laser light forms a static latent image on the surface of the
Photosensitive Drum. (Image exposure: laser exposed area becomes im-
age area)
3 Developing block Development With the dry, 2-component AC developing method, toner that has been
negatively charged by the Developing Cylinder is attached to the Photo-
sensitive Drum.
2. Technology
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