Canon Color imageCLASS MF8580Cdw, Service Manual

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Technical Overview > Image Formation System > Image Forming Process > Transfer block
Technical Overview > Image Formation System > Image Forming Process > Transfer block
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Transfer block
The toner image on the photosensitive drum is transferred to paper through 3 steps in this
block.
● Step 4: Primary transfer
Transfer the toner image on the photosensitive drum to the ITB.
The DC positive bias is applied to the primary transfer pad to charge the ITB positively. By
this, the negatively charged toner on the photosensitive drum is transferred to the ITB.
ITB
Primary transfer pad
Photosensitive
drum
DC bias
F-2-22
● Step 5: Secondary transfer
Transfer the toner image on the ITB to paper.
The DC positive bias is applied to the secondary transfer external roller to charge the paper
positively. By this, the negatively charged toner image on the ITB is transferred to the paper.
ITB
Secondary
transfer external roller
Media
ITB drive roller
DC bias
Static charge eliminator
● Step 6: Separation
Separate the paper from the ITB using paper elasticity and curvature of the ITB drive motor.
To stabilize the paper delivery and image quality, use the static eliminator to decay the
potential on the back of the paper after image transfer.
ITB
ITB drive roller
Secondary
transfer external roller
Media
.
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