Konica-Minolta bizhub C3851FS
Troubleshooting. Image Quality Problem. Printer monocolor 2
Printer monocolor: uneven density in main 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 with cleaning jig. | |
3 | PH unit | The surface of the PH window is dirty. | YES | Clean with cleaning jig. |
4 | Transfer roller | Check that the spring does not come off during the pressure operation of the transfer roller. | NO | • Correct. • Replace the transfer roller unit. |
5 | Transfer belt unit | Transfer belt unit makes positive contact with plates on rails. | NO | Check and correct contacts. |
6 | Is abnormality found in the cam gear? | YES | Replace the transfer belt unit. | |
7 | The problem has been eliminated through the checks of steps up to 6. | NO | • Replace the PH unit. • Replace the high voltage power supply |
Printer monocolor: low image density
Troubleshooting procedure
Step | Section | Check item | Result | Action |
---|---|---|---|---|
1 | IDC sensor | The surface of the IDC sensor is dirty. | YES | Clean. |
2 | PH unit | The surface of the PH window is dirty. | YES | Clean with cleaning jig. |
3 | Transfer belt unit | Transfer belt unit makes positive contact with plates on rails. | NO | Check and correct contacts |
4 | Is abnormality found in the cam gear? | YES | Replace the transfer belt unit. | |
5 | The problem has been eliminated through the checks of steps up to 4. | NO | • Replace the imaging unit. • Replace the IDC sensor. • Replace the printer control board. • Replace the PH unit. • Replace the high voltage power supply. |
Printer monocolor: gradation reproduction failure
Troubleshooting procedure
Step | Section | Check item | Result | Action |
---|---|---|---|---|
1 | Photo/density | Original type and screen pattern are selected properly. | NO | Change screen pattern. |
2 | PH unit | The surface of the PH window is dirty. | YES | Clean with cleaning jig. |
3 | IDC sensor | The surface of the IDC sensor is dirty. | YES | Clean. |
4 | The problem has been eliminated through the checks of steps up to 3. | NO | • Replace the imaging unit. • Replace the printer control board • Replace the PH unit. • Replace the high voltage power supply. |