Basic Structure Of The Printing System - Brother HL-2400C Service Manual

1.1.2

Basic Structure of the Printing System

A toner image is formed through the potential of the OPC belt varying in each of the
charger, exposure, development, transfer and cleaning processes.
(1) Process of Print System (See Fig.4-9.)
i) The OPC belt is biased to the voltage -CBV(V) by the power supply CBV.
ii) A negative high voltage is applied to the charger unit by the power supply CHV,
and a corona is generated as the result.
iii) The developer magnetic roller of the toner cartridges is biased to -DBV(V) by
the power supply DBV.
iv) The frame potential of the transfer drum is GND.
Fuser Unit
Paper Discharger
ACHV
Transfer Roller
THV (+)
THV ( - )
No.
1 Charging
2 First Transfer
3 Developing
Bias
4 Second Transfer
5 Transfer Roller Cleaning
6 Paper Discharging
7 Drum Cleaning
Cleaning Unit
FCBV
Cleaning
Burush
Transfer Drum
Paper
Erase Lamp
Fig.4-9
Function
Y,M
C,K
IV-8
OPC Belt
Charger
Cleaning
Blade
Power Supply (P/S)
P/S Name
CHV(-)
HVRD6190
CBV(-)
DBV(-A)
DBV(-B)
THV(+)
THV(-)
ACV( ∼ )
DCV(+)
FCBV
Toner
Toner Cartridge
K
Develop
Y
M
DBV
C
CBV
Scannerl Unit
Po
CHV
ZDV
Approx.Output Voltage
4.6KV
619V
200V ∼ 900V
200V ∼ 400V
200V ∼ 400V
400V ∼ 3,000V
600V
4.9KV
200V
200V ∼ 1,500V