Service manual

Troubleshooting

4-20

Samsung Electronics

Abnormal Image Printing and Defective Roller

If abnormal image prints periodically, check the parts shown below.

Different image den-

sity

(left and right)

1. Uneven pressure between Charge roller

and OPC Drum

2. Uneven pressure between Dev roller and

OPC drum

3. Transfer roller’s pressure force uneven at

each side

1. Change OPC cartridge

2. Change toner and / or OPC Drum

3. Check left and right transfer roller springs

Horizontal lines or

bands

1. Bad contact on high voltage terminal

2. Contamination of charge roller

3. Contamination of heat roller 4. Malfunction

of LSU

1. Clean each contact and check continuity

2. Print several “cleaning sheets” – replace

OPC drum if problem persists.

3. Replace fuser unit

4. Check Main PBA., LSU harness and LSU

NO Roller Abnormal image period Kind of abnormal image

1 OPC Drum 94.3 mm White spot. Black spot

2 Charge Roller 37.7 mm White spot. Black spot

3 Supply Roller 35.8 mm Horizontal dark band

4 Develope Roller 44.8 mm Horizontal dark band

5 Transfer Roller 56.6 mm Contamination on reverse side of paper / trans-

fer fault

6 Heat Roller 82.5 mm Black spot, White spot

7 Pressure Roller 78.5 mm Contamination on reverse side of paper

Error Status Check Solution

Digital Printer