Brother International HL 1850 Service Manual - Page 190

CHAPTER

6

TROUBLESHOOTING

3.2.2

Causes

&

countermeasures

The

causes

for

paper

jam

problems

vary

depending

on

the

location

of

the

paper

jam.

When

a

paper

jam

occurs

inside

the

printer,

you

have

to

find

the

location

of

the

paper

jam

first,

remove

the

jammed

paper

and

then

take

the

appropriate

countermeasure

referring

to

the

table

below;

Problem

Type

of

Jam

Cause

Remedy

Jam

when

the

printer

is

turned

on.

Paper

stuck

The

front

registration

sensor

or

paper

eject

sensor

is

turned

on.

Remove

the

paper

inside

the

printer.

If

there

is

no

paper,

check

the

suspect

sensors

referring

to

subsection

9.2

`Sensor

Check

Mode'

in

this

Chapter.

Top

of

paper

stopped

at

350mm

from

the

second

exit

roller.

Next

paper

is

not

fed.

Jam

caused

by

paper

length

detected

as

longer

than

400mm

(16

in).

The

front

registration

sensor

is

not

returning

properly

and

is

not

turning

off.

Check

front

registration

sensor

motion

referring

to

subsection

9.2

`Sensor

Check

Mode'

in

this

Chapter.

Bottom

of

paper

stopped

around

the

transfer

roller.

Jam

caused

by

paper

length

detected

as

shorter

than

80mm.

The

front

registration

sensor

was

turned

off

early.

Malfunction

of

actuator

or

hardware

noise.

Check

the

front

registration

sensor

referring

to

subsection

9.2

`Sensor

Check

Mode'

in

this

Chapter.

Top

of

paper

stopped

between

the

paper

feed

roller

and

the

pick-up

roller.

Jam

caused

by

a

paper

feed

delay.

Paper

was

not

fed

in

at

the

proper

timing

due

to

paper

dust

or

wear

of

the

rubber

pick-up

roller.

Remove

the

paper

dust

attached

to

the

pick-up

roller.

If

the

rubber

is

worn

out,

replace

it

with

a

new

one.

Top

of

paper

stopped

at

50mm

from

the

contact

point

of

the

heat

roller

and

pressure

roller.

Jam

caused

by

the

paper

not

being

sensed

when

ejected

from

the

paper

eject

sensor.

The

paper

eject

sensor

is

not

working

properly

and

has

not

turned

off.

(single

printing)

Check

sensor

motion

referring

to

subsection

9.2

`Sensor

Check

Mode'

in

this

Chapter.

•

Jam

after

paper

is

ejected.

Jam

caused

by

the

paper

not

being

sensed

when

ejected

from

the

paper

eject

sensor.

.

The

paper

eject

sensor

or

front

registration

sensor

is

not

working

properly

and

has

not

turned

off.

(continuous

printing)

Check

sensor

motion

referring

to

subsection

9.2

`Sensor

Check

Mode'

in

this

Chapter.

6-22

Brother International HL 1850 Service Manual - Page 190

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