Troubleshooting tools Repetitive image defect ruler First occurrence of print defect Toner/developing cylinder (37.7 mm, 1.5 in.) Toner/primary charging roller (37.7 mm, 1.5 in.) Transfer roller (45.2 mm, 1.8 in.) Heating element (56.5 mm, 2.2 in.) Pressure roller (62.8 mm, 2.5 in.) Toner/drum (75.4 mm, 3.0 in.) Figure 60. Repetitive image defect ruler Q1342-90910 Troubleshooting tools 87