HP 2600n Service Manual - Page 161
Repetitive image defect ruler, identify the component that is causing the defect.
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Repetitive image defect ruler Use a repetitive image defect 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 see the Table 6-15 Repetitive image defects table to identify the component that is causing the defect. Table 6-15 Repetitive image defects Measurement 24.7 mm (0.97 inch) 26.7 mm (1.05 inches) 32.9 mm (1.3 inches) 37.7 mm (1.48 inches) 54.5 mm (2.15 inches) 56.6 mm (2.22 inches) 62.8 mm (2.47 inches) 75.4 mm (2.97 inches) Component Developer sleeve Charge roller RS roller Transfer roller ETB rollers Fuser sleeve Pressure roller OPC ENWW Repetitive image defect ruler 147