Brother International HL-3400CN Service Manual - Page 63

CHAPTER

4

STRUCTURE

OF

SYSTEM

COMPONENTS

1.4.3

Details

of

each

process

1

Charging

The

charging

process

ensures

that

the

OPC

belt

is

evenly

charged

by

the

charger

system.

(1)

Structure

of

the

charger

unit

(Refer

to

Fig.4-8

and

Fig.4-11)

i)

The

charger

unit

is

located

as

shown

in

Fig.4-8.

ii)

The

charger

unit

consists

of

the

case,

corona

wire

and

grid.

iii)

The

charger

unit

charges

the

OPC

belt

surface

to

the

potential

-V

0

(V)

with

the

corona

charge.

iv)

The

charger

unit

has

the

grid

controlled

to

the

constant

voltage

ZD(V)

for

even

charging.

(2)

Process

of

charging

(Refer

to

Fig.4-12.)

i)

The

status

of

the

OPC

belt

surface

before

charging

is

-CBV(V).

ii)

The

charger

unit

charges

the

OPC

belt

surface

evenly

to

-V

0

(V)

by

generating

a

negative

charge.

ZD

Grid

Corona

wire

CBV

•

1

1,

,11

C

1

1

I

t"

0

%

,

elI

•%

Case

CHV

Fig.

4-11

OO

oo

°

O°O

oo°

oo

oO

r==>

-Vo

• •

Cleaning

(Blade)

Charging

Fig.

4-12

4-12

Brother International HL-3400CN Service Manual - Page 63

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