Canon Color imageCLASS MF8280Cw, Руководство по обслуживанию

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Technical Overview > Image Formation System > Controls > High-voltage power supply control
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 Purpose Applied to
Primary charging
bias
DC negative
Charge the photosensitive drum
surface negatively.
Primary charging roller
(cartridge)
Developing bias DC negative
Deposit toner on the static latent
image formed on the photosensitive
drum.
Developing cylinder
(cartridge)
Blade bias DC negative
Adjust the charged toner amount on
the developing cylinder.
Developing blade
(cartridge)
Primary transfer
bias
DC negative
Transfer the toner image on the
photosensitive drum to the ITB.
Developing blade
(cartridge)
Secondary transfer
bias
DC positive
Transfer the toner image on the ITB
to the paper.
Secondary transfer
external roller
DC negative
Clean the secondary transfer
external roller.
ITB cleaning brush
bias
DC positive
Charge the toner on the ITB
positively.
ITB cleaning brush
ITB cleaning roller
bias
DC positive
Charge the toner on the ITB
positively.
ITB cleaning roller
T-2-12
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TR1_1
TR1_23 TR1_23
TR1_4
TR2
ICLB
BLD1 BLD2 BLD3 BLD4
DEV1 DEV2 DEV3 DEV4
PRI
ICLR
Primary charging
bias circuit
Developing bias
circuit
Blade bias circuit
Photosensitive drum
Primary transfer pad
Cartridge
Secondary transfer
external roller
ITB
cleaning unit
Primary transfer
bias circuit
Secondary transfer
bias circuit
ITB cleaning brush
bias circuit
ITB cleaning roller
bias circuit
High-voltage power supply
DC controller
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