Samsung ProXpress M4070FR
Troubleshooting. Image quality 1
1. Vertical Black Line and Band
• Description : Straight thin black vertical line occurs in the printed image.
| Probable Cause | Solution |
|---|---|
| The paper is not the proper type. | Replace the paper. |
| The paper path is contaminated by toner residue, debris etc. | Clean the paper path. |
| The imaging unit is defective. | Replace the imaging unit. |
| The transfer roller is contaminated or worn out. | Replace the transfer roller. |
| The pressure roller or heat roller in fuser unit defective. | 1) Turn the machine off. 2) Remove and replace the fuser unit. 3) Turn the machine on. WARNING Do not touch the fuser unit while it is hot. |
2. Vertical White Line, Band
• Description : White vertical voids occurs in the printed image.
| Probable Cause | Solution |
|---|---|
| The paper is not the proper type. | Replace the paper. |
| The paper path is contaminated by toner residue, debris etc. | Clean the paper path. |
| The imaging unit is defective. | Replace the imaging unit. |
| The transfer roller is contaminated or worn out. | Replace the transfer roller. |
| The LSU window is contaminated. | 1) Clean the LSU window. 2) Replace the LSU |
| The connection between the LSU and main board is defective. | 1) Disconnect and reconnect the harness. 2) Replace the harness. |
3. Horizontal Black Band
• Description : Dark of blurry horizontal stripes occur in the printing periodically.
| Probable Cause | Solution |
|---|---|
| The paper is dirty or not the proper type. | Replace the paper. |
| The paper path is contaminated by toner residue, debris etc. | Clean the paper path. |
| The contact terminal of the imaging unit is bad. | 1) Clean the contact terminal of the imaging unit. 2) Replace the imaging unit. |
| The surface of transfer roller is contaminated or worn out. | Replace the transfer roller. |
| The LSU window is contaminated. | 1) Clean the LSU window. |
| The pressure roller or heat roller in fuser unit defective. | 1) Turn the machine off. 2) Remove and replace the fuser unit. 3) Turn the machine on. WARNING Do not touch the fuser unit while it is hot. |
| HVPS terminal is contaminated. | Clean the contaminated terminal. |
| The output from the HVPS is abnormal. | Replace the HVPS board. |
NOTE Roller period table
| Roller | Period | Replacement part |
|---|---|---|
| 1st Pressure roller | 62.8 mm | Fuser unit |
| 2nd Pressure roller | 37.7 mm | |
| Heat roller | 77.8 mm | |
| Charge roller | 34.5 mm | Toner Cartridge |
| Developer roller | 37 mm | |
| OPC drum | 76 mm | |
| Supply roller | 69.57 mm | |
| Transfer roller | 47.1 mm | Transfer roller |