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Konica-Minolta bizhub 4052
Troubleshooting. Image Quality Problem. Printer 1
How to identify problematic part
- This chapter is divided into two parts: “Initial check items” and “Troubleshooting procedure by a particular image quality problem.”
- When an image quality problem occurs, first go through the "Initial check items" and, if the cause is yet to be identified, go to "Troubleshooting procedure by a particular image quality problem."
Initial check items
- Let the machine produce a test print and determine whether the image problem is attributable to the scanner or printer system.
- Evaluation procedure
Action |
Result |
Cause |
From [Service Mode], select [Test Mode] -> [Gradation Pattern], and produce a test print. Is image problem evident? |
YES |
Printer |
NO |
Scanner |
Printer: white lines and white bands in sub scan direction
Troubleshooting procedure
Step |
Section |
Check item |
Result |
Action |
1 |
Image check |
A white line or black line in sub scan direction is sharp. |
YES |
Clean the electrostatic charger wire. |
3 |
Imaging unit |
The surface of the PC drum is scratched. |
YES |
Replace the imaging unit. |
4 |
Dirty on the outside. |
YES |
Clean. |
5 |
Contact terminals make good connection between each imaging unit and machine. |
NO |
Clean contact terminals. |
6 |
Developing bias contact terminal makes good connection. |
NO |
Clean contact terminal and check terminal position. |
7 |
|
The problem has been eliminated through the checks of steps up to 6. |
NO |
Replace the transfer roller. |
Replace the printhead. |
Printer: white lines and white bands in main scan direction
Troubleshooting procedure
Step |
Section |
Check item |
Result |
Action |
1 |
Image check |
A white line or black line in main scan direction is sharp. |
NO |
Clean the electrostatic charger wire. |
2 |
Imaging unit |
The surface of the PC drum is scratched. |
YES |
Replace the imaging unit. |
3 |
Dirty on the outside. |
YES |
Clean. |
4 |
Contact terminals make good connection between each imaging unit and machine. |
NO |
Clean contact terminals. |
5 |
Developing bias contact terminal makes good connection. |
NO |
Clean contact terminal and check terminal position. |
6 |
|
The problem has been eliminated through the checks of steps up to 5. |
NO |
Replace the transfer roller. |
Replace the printhead. |
Printer: uneven density in sub scan direction
Troubleshooting procedure
Step |
Section |
Check item |
Result |
Action |
1 |
Imaging unit |
The surface of the PC drum is scratched. |
YES |
Replace the imaging unit. |
2 |
Dirty on the outside. |
YES |
Clean. |
3 |
Transfer roller |
Image transfer roller is installed properly. |
NO |
Reinstall. |
4 |
Image transfer roller is dirty or scratched. |
YES |
Replace the transfer roller. |
5 |
|
The problem has been eliminated through the checks of steps up to 4. |
NO |
Replace the power supply unit. |
Replace the printhead. |
Replace the MFP board. |