HP LaserJet Enterprise MFP M430
Troubleshooting. Repetitive image defect ruler
When troubleshooting the source of some print image defects, one solution is to identify if it is a repetitive defect (does the print quality defect appear multiple times on the printed page?). If this is the case, use a ruler to measure occurrences of repetitive image defects to help solve image-quality problems. For more information, see Using a ruler to measure between repetitive defects.
Use a ruler to measure occurrences of repetitive image defects to help solve image-quality problems. Place the ruler next to the first first occurrence of the defect on the page. Find the distance between identical defects and use the table below to identify the component that is causing the defect.
CAUTION:
Do not use solvents or oils to clean rollers. Instead, rub the roller with a lint-free cloth. If dirt is difficult difficult to remove, rub the roller with a lint-free cloth that has been dampened with water.
NOTE:
The primary charging roller, photosensitive drum, and developer roller cannot be cleaned because they are internal assemblies in the toner cartridge or imaging drum. If one of these assemblies is causing the defect, replace the toner cartridge.
The primary fuser sleeve unit or pressure roller cannot be cleaned because they are internal assemblies in the fuser. If one of these assemblies is causing the defect, replace the fuse
TIP:
To make a printer specific specific repetitive defect ruler, use a metric ruler to transfer the measurements in the table below to a transparency or the edge of a piece of paper—clearly label each ruler mark with the associated defective assembly.
Assembly | Distance between defects |
---|---|
Primary charging roller | 28 mm (1.10 in) |
Developer roller | 31 mm (1.22 in) |
Transfer roller | 39 mm (1.54 in) |
Registration roller | 43 mm (1.69 in) |
Cassette separation roller | 44 mm (1.73 in) |
Cassette pickup or feed roller | 50 mm (1.97 in) |
Fuser film | 57 mm (2.24 in) |
Pressure roller | 63 mm (2.48 in) |
Photosensitive drum | 75 mm (2.95 in) |