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HP Color LaserJet Pro M452

Troubleshooting. Print quality. Repetitive defects 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.

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.

NOTE:
Do not use solvents or oils to clean rollers. Instead, rub the roller with a lint-free cloth. If dirt is difficult to remove, rub the roller with a lint-free cloth that has been dampened with water.

Distance between identical defects Component Notes
22.6 mm (0.89 in) Developer roller Appears in the form of dropouts.
23.6 mm (0.93 in) Primary charging roller Appears in the form of dropouts.
29.6 mm (1.17 in) RS roller  
35.0 mm (1.38 in) Intermediate transfer belt (ITB) assist roller  
50.0 mm (1.97 in) Secondary transfer roller Appears in the form of dropouts or dirt on the back of the page.
50.0 mm (1.97 in) Large assist roller  
57.0 mm (2.24 in) Fuser rollers (3) Appears in the form of dirt (front or back of page) or loose toner.
63.0 mm (2.48 in) Photosensitive drum Appears in the form of dirt or dropouts.
63.0 mm (2.48 in) Tension roller  
75.0 mm (2.95 in) Scale  
78.0 mm (3.07 in) Cartridge station  
78.0 mm (3.07 in) Intermediate transfer belt (ITB) drive roller  
712.0 mm (28.03 in) Intermediate transfer belt (ITB) length  
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Service Mode, Troubleshooting
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