Brother International HL 1850 Service Manual - Page 203

CHAPTER

6

TROUBLESHOOTING

6.2

Troubleshooting

Image

Defect

Several

types

of

the

image

defects

can

be

cleared

by

end

users.

For

those

defects,

instruct

the

user

to

check

the

`User

Check'

items

described

in

each

table.

Even

if

the

same

image

defect

appears,

the

following

procedures

should

be

followed

in

the

event

of

specific

image

defects.

See

also

subsection

6.3

`Location

of

Ground

Contacts'

in

this

Chapter

for

information

about

the

location

of

the

grounding

contacts.

0

CAUTION:

When

using

the

printer

for

a

special

job,

such

as

printing

of

name

cards,

print

quality

cannot

be

guaranteed.

1-1

Light

ILP

Fr

LA

User

Check

(1)

Check

the

printer's

environment.

Conditions

such

as

humidity,

high

temperatures,

etc.

may

cause

this

situation

to

occur.

(2)

If

the

whole

page

is

light,

toner

save

mode

may

be

on.

Disable

toner

save

mode

within

Printer

Properties

tab

of

the

driver.

(3)

Try

installing

a

new

toner

cartridge

or

drum

unit.

Possible

cause

Step

Check

Result

Remedy

Ground

contacts

Toner

sensing

failure

(printer

side)

1

Can

printing

be

started

with

the

drum

unit

and

toner

cartridge

removed?

Yes

Check

if

the

toner

sensor

is

dirty

and

check

the

toner

sensor

connection.

Toner

sensing

failure

(toner

cartridge

side)

2

Is

the

problem

solved

when

4

or

5

pages

are

printed

after

the

toner

cartridge

is

replaced

with

a

full

one?

Yes

The

wiper

of

the

toner

cartridge

is

defective.

Replace

the

toner

cartridge.

Drum

connection

failure

3

Are

all

the

contacts

between

the

drum

unit

and

printer

body

connected

correctly?

No

Clean

contact

electrodes

both

on

the

drum

unit

and

in

the

printer

body.

(1), (4),

(5),

(6)

High

-voltage

power

supply

PCB

failure

4

Is

the

harness

connection

between

the

high

-voltage

power

supply

PCB

and

the

engine

PCB

correct?

Yes

Replace

the

high

-

voltage

power

supply

PCB.

Engine

PCB

/

Main

PCB

failure

5

Is

the

harness

connection

between

the

engine

PCB

and

the

main

PCB

correct?

Yes

Replace

the

engine

PCB

or

the

main

PCB.

Dirt

on

the

scanner

window

6

Is

there

any

dirt

on

the

scanner

window?

Yes

Wipe

it

off

with

a

soft

clean

paper.

Laser

unit

failure

7

,

Is

the

problem

solved

after

replacing

the

laser

unit?

Yes

Replace

the

laser

unit.

6-36

Brother International HL 1850 Service Manual - Page 203

Troubleshooting, Image, Defect, Light

Page 203 highlights