EN Chapter 7 Troubleshooting 243
Repetitive defect ruler
Repetitive print defects are usually associated with a specific roller within the printer or the toner
cartridge. Use figure 98 to isolate the cause of repetitive print defects. Align the first occurrence of
the defect with the top of the “ruler” and measure to the next occurrence of the defect to determine
the roller in question. When you are certain that your defect pattern matches the pattern of the ruler,
replace the indicated roller.
Figure 98. Repetitive print defect ruler
White spots on
black
1. Print a few more pages to see
if the problem corrects itself.
2. Make sure that print media
type and quality meet HP
specifications.
3. Make sure that the
environmental specifications for
the printer are being met.
4. Replace the toner cartridge.
Table 42. Image defects
Problem Cause Solution
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