Repetitive image defect ruler Figure 77. Repetitive image defect ruler EN Troubleshooting tools 191 ce of print defect inder (32 mm) (37.7 mm) ng roller (38 mm) First occurren ce of print defect Developing cyl inder (32 mm) Delivery roller (37.7 mm) Primary chargi ng roller (38 mm) Transfer roller (45 mm) Pressure roller (62.8 mm) Upper heating element film (76 mm) Toner cartridg e photosensitive drum (76 mm)