HP Color LaserJet Managed MFP E78228
Troubleshooting. Image Defects 1
Vertical black band
| Step | Cause | Action |
|---|---|---|
| 1 | Charge roller (CR) is contaminated. | Check if the CR is contaminated. Replace the drum unit if there are additional problems. |
| 2 | ITB belt is contaminated. • ITB cleaning is poor. • ITB cleaning blade is partially broken. |
Check if the ITB belt is contaminated. Replace the ITB cleaner if there are additional problems. |
| 3 | The scanner unit is contaminated. • Scan glass contamination • Mirror contamination • CCD sensor contamination |
Wipe the contaminated part of the surface with a soft cloth. CAUTION:The scanner unit contains fragile parts. Use caution while cleaning. |
Vertical white band, light band
| Step | Cause | Action |
|---|---|---|
| 1 | A foreign substance is between the developing roller (DR) and blade - The toner on the magnetic roller is partially empty. |
Remove the foreign substance. |
| 2 | The Developer unit carrier is insufficient. | Replace the developer unit. - Check the remaining toner. - Make sure the toner layer is uniform on the magnetic roller in the developer unit. |
| 3 | The laser beam path is blocked. A foreign substance is on the laser scanner assembly window. |
Clean the laser scanner assembly window. |
| 4 | OPC is scratched. | Replace the drum unit. |
Horizontal periodic black band or dot
| Step | Cause | Action |
|---|---|---|
| 1 | Horizontal periodic dot (CR, 37.7 mm) - The surface of the charge roller (CR) is contaminated. - CR is scratched |
Wipe the surface of the contaminated part with a soft cloth and alcohol. Replace the drum unit. |
| 2 | Horizontal periodic black band (CR, 37.7 mm) - CR in poor condition. |
Replace the drum unit. |
| 3 | OPC is damaged. | Replace the drum unit. |