Brother International HL 1850 Service Manual - Page 207

CHAPTER

6

TROUBLESHOOTING

1-5

Dirt

on

the

back

of

paper

10"

1

Possible

cause

Step

Check

Result

Remedy

Fixing

unit

dirty

1

Is

the

pressure

roller

dirty?

Is

any

other

area

in

the

printer

dirty?

Yes

Clean

the

pressure

roller

referring

to

the

following

procedure.

Dirt

in

the

drum

unit

2

Is

the

transfer

roller

dirty?

Is

the

problem

solved

after

replacing

the

drum

unit?

Yes

Replace

the

drum

unit

No

Replace

the

high

-voltage

power

supply

PCB.

NOTE:

This

problem

may

disappear

after

printing

approximately

10

pages

of

completely

blank

sheets.

How

to

clean

the

pressure

roller

Clean

the

pressure

roller

as

follows;

(1)

Set

three

or

more

sheets

of

paper

in

the

paper

cassette.

(2)

Turn

off

the

power

switch

of

the

printer.

(3)

While

holding

down

the

Go

switch,

press

-

switch,

+

switch,

and

then

Set

switch.

The

LCD

display

shows

"TEST

MENU".

(4)

Press

the

Set

switch

and

"SINGLE

TEST

PRINT"

will

appear

on

the

LCD

display.

(5)

Press

the

+

switch

and

"REPEAT

TEST

PRINT"

will

appear

on

the

LCD

display.

(6)

Press

the

Set

switch

and

"TEST

PRINT

NORMAL"

will

appear

on

the

LCD

display.

(7)

Press

the

+

switch

four

times

and

"TEST

PRINT

WHITE"

will

appear

on

the

LCD

display.

(8)

Press

the

Set

switch

and

release

it

immediately.

A

blank

page

is

printed

while

cleaning

the

pressure

roller.

(9)

Press

the

Job

Cancel

switch

after

printing

three

or

more

pages

to

stop

printing.

6-40

Brother International HL 1850 Service Manual - Page 207

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