Brother International HL-3400CN Service Manual - Page 308

CHAPTER

8

TROUBLESHOOTING

1-6

White

Line

(1)

Phenomenon

Vertical

white

line

appears

in

the

specific

color

area

when

test

-printed

in

the

four

color

mode

(Stripe

Mode),

as

shown

in

print

sample

(6)

of

Page

8-45.

Main

Causes

(1)

Foreign

particles

adhering

to

the

following

places

around

the

developer

roller.

(Refer

to

Fig.8-8.)

•

Between

the

cartridge

cover

and

developer

roller

(a)

•

On

the

surface

of

the

developer

roller

(b)

•

Between

the

blade

fixing

plate

and

the

developer

roller

(c)

•

Between

the

blade

and

the

developer

roller

(d)

(2)

Foreign

particles

adhering

to

the

toner

cartridge's

main

blade

of

the

color

in

question.

(a)

(b)

(c)

(d)

Blade

fixing

plate

Developer

roller

0

0

Developer

blade

blade

Fig.

8-3

Countermeasures

(1)

Implement

the

test

print.

(2)

Confirm

the

color

of

the

toner

cartridge

in

question

that

has

caused

the

white

line.

(3)

Remove

the

foreign

particles

adhering

to

the

developer

roller.

If

foreign

particles

adhere

to

(d)

of

Fig.8-8,

remove

them

referring

to

one

of

the

figures

below.

Approx.

1

cm

O

Fig.

8-4

Piece

of

OHP

sheet

Fig.

8-5

Developer

roller

8-50

Brother International HL-3400CN Service Manual - Page 308

Fig.8-8

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