5.3Troubleshooting Image Defect

Image defect related problems are end user recoverable if following the User Check items. If the same problem occurs, follow each procedure in the order of the number described in the Step column in the tables below.

■Light

<User Check>

-Check the machine's environment. Low temperature and low humidity conditions can cause this problem.

-If the whole page is light, toner save mode may be on.

-Replace the toner cartridge or drum unit with a new one.

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

Dirt on exposure

Are the electrodes of the

 

Clean both electrodes.

1

drum electrode

drum unit and machine

Yes

(Refer to Fig. 3-2, Fig. 3-3.)

 

 

body dirty?

 

 

 

 

 

 

 

 

Dirt on scanner

Is the scanner windows

 

Wipe the dirt off with a soft,

2

windows of the

of the laser unit dirty?

Yes

clean, lint free cloth.

 

laser unit

 

 

(Refer to Fig. 3-6.)

 

 

 

 

 

 

Toner sensor

After replacing the toner

 

Replace the toner

 

failure

cartridge with a new

 

cartridge.

3

 

one, does the same

No

 

 

problem occur even

 

 

 

 

 

 

 

after printing several

 

 

 

 

pages?

 

 

 

 

 

 

 

 

 

Does the machine start

 

Clean the toner sensor.

 

 

printing even after

 

(receiving light side /

 

 

removing the toner

 

emitting light side)

 

 

cartridge from the drum

 

Check the harness

4

 

unit?

Yes

connection of the toner

 

 

LED PCB ASSY.

 

 

 

 

 

 

 

 

(luminescence side)

 

 

 

 

Replace the toner sensor

 

 

 

 

PCB ASSY or toner LED

 

 

 

 

PCB ASSY.

 

 

 

 

 

 

Between the

Is the harness of the

 

Reconnect the harness of

5

HVPS PCB/Main

HVPS PCB ASSY and

Yes

the HVPS PCB ASSY and

PCB connection

main PCB ASSY

main PCB ASSY.

 

 

 

failure

connected correctly?

 

 

 

 

 

 

 

 

HVPS PCB

Is the problem solved

 

Replace the HVPS PCB

6

failure

after replacing the

Yes

ASSY.

 

 

HVPS PCB ASSY?

 

 

 

 

 

 

 

 

Main PCB failure

Is the problem solved

 

Replace the main PCB

7

 

after replacing the main

Yes

ASSY.

 

 

PCB ASSY?

 

 

 

 

 

 

 

 

Laser unit failure

Is the problem solved

 

Replace the laser unit.

8

 

after replacing the laser

Yes

 

 

 

unit?

 

 

 

 

 

 

 

3-46

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