HP LaserJet M9040M9050 Multifunction Printer series - Manual (Page 239)

Vertical white lines
Figure 12-83 Vertical white lines
1. Print a few more pages to see if the problem corrects itself.
2. Make sure that the type and quality of the media you are using meet HP specifications. See
Supported paper and print media sizes on page 81 .
3. Replace the print cartridge.
Tire tracks
Figure 12-84 Tire tracks
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This defect typically occurs when the print cartridge has far exceeded its rated life. For example, if you
are printing a very large quantity of pages with very little toner coverage.
1. Replace the print cartridge.
2. Reduce the number of pages that you print with very low toner coverage.
White spots on black
Figure 12-85 White spots on black
1. Print a few more pages to see if the problem corrects itself.
2. Make sure that the type and quality of the media you are using meet HP specifications. See
Supported paper and print media sizes on page 81 .
ENWW Solve print-quality problems 225