Xerox 4400N - Phaser B/W Laser Printer Troubleshooting Manual page 11

Symptom: Vertical line deletions
There are localized print deletions forming narrow lines.
Symptom: Horizontal line deletions
There are localized print deletions appearing as bands running across the paper.
Symptom: Vertical dark streaks
There are black lines running across the print.
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Possible causes and solutions:
• The Print Cartridge may not be installed correctly. Remove then re-install the Print Cartridge.
• The Print Cartridge may be defective or at the end of its life. Replace the Print Cartridge.
Possible causes and solutions:
• The paper stock may be defective with creases, folds, etc. Replace the paper stock.
• The Print Cartridge may be defective or at the end of its life. Replace the Print Cartridge.
Possible causes and solutions:
• The Print Cartridge may be defective or at the end of its life. Replace the Print Cartridge.
• The fuser may be defective. Replace the fuser (in the Maintenance Kit).