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HP Color LaserJetFlow MFP E57540

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.

Place the ruler next to the 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.

IMPORTANT:
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:
Defects on the tray pickup rollers or the Tray 1 pickup roller do not cause a repetitive defect. Defects on these rollers cause a defect to appear only on the leading edge of the image.

TIP:
To make a printer specific repetitive defect ruler, use a metric ruler to transfer the measurements in Tableto 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 *1 27 mm (1.06 in)
Developer roller *1 32 mm (1.26 in)
Registration roller 42 mm (1.65 in)
Secondary transfer roller 50 mm (1.97 in)
Fuser film *2 58 mm (2.28 in)
Pressure roller *2 69 mm (2.83 in)
Photosensitive drum *1 75 mm (2.95 in)
   
   

1 The primary charging roller, photosensitive drum and developer roller cannot be cleaned. If any of these rollers are indicated, replace the toner cartridge.
2 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 fuser.

 

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