HP 2300d Service Manual - Page 229

Troubleshooting tools Repetitive defect ruler Repetitive print defects are usually caused by a specific roller in the printer or the print cartridge. Use the figure below to isolate the cause of repetitive print defects. Align the first occurrence of the defect with the top of the "ruler" (at the top or bottom of the misprinted page), and measure to the next occurrence of the defect to determine the roller in question. When the defect pattern matches the pattern of the ruler, replace the indicated roller. Initial occurrence of defect Primary charging roller-38 mm (1.50 inches) Transfer charging roller-44 mm (1.73 inches) Developing roller-47 mm (1.85 inches) Pressure roller-63 mm (2.48 inches) Fuser film-75 mm (2.95 inches) Photosensitive drum-95 mm (3.74 inches) Figure 111. Repetitive defect ruler ENWW Chapter 7 Troubleshooting 227