Q1860-90918 Chapter 7 Troubleshooting 223
Repetitive defect ruler
Repetitive print defects usually are associated with a specific roller within the printer or the toner
cartridge. Use figure 126 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 which roller is involved. When you are certain
that your defect pattern matches the pattern of the ruler, replace the appropriate roller.
Figure 126. Repetitive defect ruler
First occurrence of print defect
Toner cartridge primary charging roller—44 mm (1-3/4 in)
Toner cartridge developing cylinder or registration roller—50 mm (2 in)
Feed roller - 52 mm (2-1/16 in)
Transfer charging roller - 55 mm (2-3/16 in)
Fuser roller - 75 mm (2-15/16 in)
Fuser pressure roller - 79 mm (3-1/8 in)
Toner cartridge photosensitive drum - 94 mm (3-11/16 in)
Cassette pickup roller - 135 mm (5-5/16 in)
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