HP LaserJet Pro Color MFP M476
Troubleshooting. Print quality. Repetitive defects ruler
Defects on product rollers can cause image defects to appear at regular intervals on the page, corresponding to the circumference of the roller that is causing the defect. Measure the distance between defects that recur on a page. Use the following table or the repetitive-defect ruler to determine which roller is causing the defect. To resolve the problem, try cleaning the roller first. If the roller remains dirty after cleaning or if it is damaged, replace the part that is indicated in Table
CAUTION:
Do not use solvents or oils to clean rollers. Instead, rub the roller with lint-free paper. If dirt is difficult to remove, rub the roller with lint-free paper that has been dampened with water.
NOTE:
The following table replaces the graphical repetitive defect ruler. You can make your own ruler by using these measurements. For the most accurate results, use a metric ruler.
Repetitive defects
| Component | Distance between defects |
|---|---|
| Primary charging roller | 38 mm (1.5 in) |
| Transfer roller | 39 mm (1.54 in) |
| Developer roller | 42 mm (1.65 in) |
| Registration roller | 43 mm (1.69 in) |
| Fuser film | 57 mm (2.24 in) |
| Pressure roller | 63 mm (2.48 in) |
| Photosensitive drum | 75 mm (2.95 in) |