Brother International HL-4000CN Service Manual - Page 233

Black

Toner

Cartridge

Detached

FIP

Step

Check

Remedy

No

Yes

1

Initial

setting

Check

the

following

for

evidence

of

fault.

Cartridge

replacing

condition

Toner

cartridge

switch

ASSY

(K)

replacing

condition

Toner

cartridge

switch

ASSY

(K)

actuator

replacing

condition

Toner

cartridge

switch

ASSY

(K)

connector

replacing

condition

Replace

the

parts

concerned

.

Go

to

step

[2]

2

Checking

toner

cartridge

switch

ASSY

Does

toner

cartridge

switch

ASSY

function

normally?

Using

diagnostic

tool,

check

by

digital

input

test.

Replace

MCU

and

HVPS

PWB

Go

to

step

[3]

3

Checking

drive

PWB

for

signal

Is

P/J51-31PIN<=>P/J51-32PIN

OVDC?

Go

to

step

[7]

Go

to

step

[4]

4

Checking

toner

cartridge

switch

ASSY

(K)

for

signal

Is


OVDC?

Go

to

step

[6]

Go

to

step

[5]

5

Checking

toner

cartridge

switch

ASSY

(K)

for

continuity

Is

P434-2PIN<=>P434-1PIN

of

toner

cartridge

switch

ASSY

(K)

continuous

normally?

Go

to

step

[6]

Replace

toner

switch

ASSY

(K)

6

Checking

harness

ASSY

TNR

for

continuity

Is

J51<=>J434

continuous

normally?

Go

to

step

[7]

Replace

harness

ASSY

TNR

7

Checking

drive

PWB

for

signal

Is


OVDC?

Go

to

step

[8]

Replace

drive

PWB

8

Checking

MCU

and

HVPS

PWB

for

signal

Is

P/J12-28PIN<=>P/12-17PIN

of

MCU

and

HVPS

PWB

OVDC?

Replace

MCU

and

HVPS

PWB

Go

to

step

[9]

9

Checking

harness

ASSY

DRV2

for

continuity

Is

J12<=>J42

continuous

normally?

Replace

MCU

and

HVPS

PWB

Replace

harness

ASSY

DRV2

V-28

Brother International HL-4000CN Service Manual - Page 233

P/J434-2PIN<=>P/J434-1PIN

Page 233 highlights