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HP LaserJet Enterprise MFP M431

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)

 

 

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