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Canon MF8580Cdw Service Manual page 56

Mf8500/mf8200 series
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Manual - 750 pages
User manual - 750 pages
Getting started - 292 pages

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2
Technical Overview > Image Formation System > Controls > Transfer unit
■ Toner cartridges
● Developing cylinder contact control
The control makes the developing cylinder engagement / disengagement to the
photosensitive drum as required in the specified print mode (full color or monochrome).
By controlling the developing cylinder engagement to the photosensitive drum only when
needed, this control effectively prevents the photosensitive drums from being deteriorated to
maximize the service life.
The DC controller actuates the motor (MF8500: Developing motor, MF8200: Main motor)
to switch the direction of the engagement / disengagement cam to contact / separate the
developing cylinder to / from the photosensitive drum.
The DC controller controls the developing cylinder (engagement / disengagement) by
regulating the main motor rotation upon detecting signals from the development home
position sensor.
The state of the Developing Cylinder for each color (engagement / disengagement) differs
depending on the condition of the Main Body.
Condition of the Main Body
Y
Power OFF/Standby
Monochrome print
full-color print
Related Error Code
• E015-000 (Error in developing roller contact)
Failed to detect changes in developing home position sensor signals within the pre-defined
time after actuating motor (MF8500: Developing motor, MF8200: Main motor) to control the
developing roller contact.
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Technical Overview > Image Formation System > Controls > Transfer unit
M
C
Bk
Disengagement
Disengagement
Engagement
Engagement
T-2-16
■ Transfer unit
● Pad transfer method
This product employs the pad transfer method in the primary transfer mechanism.
Enhanced image stabilization is achieved by replacing the conventional transfer roller with the
transfer pad. The characteristic of the pad transfer method is:
• It maintains the wider nip to the photosensitive drum to increase transferability.
The figures below show the difference between the pad transfer method and the conventional
roller transfer method schematically.
Photosensitive drum
Wider nip width
ITB
Transfer pad
<Pad transfer method>
2-27
Narrow nip width
Transfer roller
<Roller transfer method>
F-2-31
2-27

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