Brother International HL-3400CN Service Manual - Page 310

CHAPTER

8

TROUBLESHOOTING

1-9

Black

Line

/

Blur

in

the

Image

Phenomenon

Fine

black

line

or

blur

appears

in

the

printed

image

as

shown

in

print

sample

(9)

of

Page

8-

45.

Main

Causes

(1)

The

corona

wire

of

the

paper

discharger

unit

is

dirty.

(2)

OPC

belt

surface

is

damaged.

(3)

Foreign

particles

(paper

dust,

etc.)

are

stuck

between

the

cleaning

blade

and

OPC

belt.

(4)

Debris

adhering

to

the

base

of

the

toner

cartridge's

developer

roller

where

it

contacts

with

the

OPC

belt.

Countermeasures

(1)

Remove

the

OPC

belt

cartridge.

1-1)

Clean

the

discharger

unit

(corona

wire).

(See

Section

2.6

of

Chapter

6.)

1-2)

Replace

the

OPC

belt

cartridge

with

a

new

one.

(See

Section

4.1

of

Chapter

6.)

(2)

Clean

the

surface

of

the

developer

roller.

1-10

Vertical

Line

Phenomenon

Vertical

line

appears

in

the

printed

image

as

shown

in

print

sample

(10)

of

Page

8-45.

Main

Causes

(1)

Foreign

particles

(dust,

etc.)

adhering

to

the

parts

located

around

the

transfer

drum,

and

consequently

in

contact

with

the

toner

image

on

the

transfer

drum.

(2)

Damage

of

the

OPC

belt

due

to

foreign

particles

adhering

to

the

blade

of

the

OPC

belt

cleaner.

Countermeasures

(1)

Clean

the

paper

discharger

unit.

(See

Section

2.5

of

Chapter

6.)

(2)

Clean

the

charger

unit

(corona

wire)

of

the

OPC

belt

cartridge.

(See

Section

2.6

of

Chapter

6.)

(3)

Clean

the

rear

face

of

the

waste

toner

feeder.

(4)

Replace

the

OPC

belt

cartridge

with

a

new

one.

8-52

Brother International HL-3400CN Service Manual - Page 310

consequently

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