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Controls - Canon MF8580Cdw Service Manual

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 > High-voltage power supply control

Controls

■ High-voltage power supply control
● Overview
The high-voltage power supply PCBs are to apply high-voltage bias to the primary charging
roller, the primary transfer pad, the secondary transfer external roller, and the ITB cleaning
unit. Such high-voltage bias is generated through control by the DC controller on the high-
voltage power supply PCBs.
The figure below shows the high-voltage power source schematically.
Type
Bias applied
Primary charging
Charge the photosensitive drum
DC negative
bias
surface negatively.
Deposit toner on the static latent
Developing bias
DC negative
image formed on the photosensitive
drum.
Adjust the charged toner amount on
Blade bias
DC negative
the developing cylinder.
Primary transfer
Transfer the toner image on the
DC negative
bias
photosensitive drum to the ITB.
Transfer the toner image on the ITB
DC positive
to the paper.
Secondary transfer
bias
Clean the secondary transfer
DC negative
external roller.
ITB cleaning brush
Charge the toner on the ITB
DC positive
bias
positively.
ITB cleaning roller
Charge the toner on the ITB
DC positive
bias
positively.
2
Technical Overview > Image Formation System > Controls > High-voltage power supply control
Purpose
Applied to
Primary charging roller
(cartridge)
Developing cylinder
(cartridge)
Developing blade
(cartridge)
Developing blade
(cartridge)
Secondary transfer
external roller
ITB cleaning brush
ITB cleaning roller
T-2-12
Primary charging
Developing bias
bias circuit
circuit
Cartridge
Photosensitive drum
Primary transfer pad
ICLB
ICLR
ITB
??
cleaning unit
Secondary transfer
external roller
ITB cleaning brush
ITB cleaning roller
Secondary transfer
bias circuit
bias circuit
DC controller
2-23
Blade bias circuit
Primary transfer
bias circuit
bias circuit
High-voltage power supply
F-2-28
2-23

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