Repetitive defect ruler Repetitive print defects are usually caused by a specific roller in the printer or the toner 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 161. Repetitive defect ruler C7058-90936 Image-formation troubleshooting 207