ENWW Chapter 7 Troubleshooting 227
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.
Figure 111. Repetitive defect ruler
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)
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