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Printing quality problems
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5. Troubleshooting
Vertical lines If black vertical streaks appear on the page:
• The surface (drum part) of the imaging unit inside the machine has probably been scratched. Remove the toner cartridge and install
a new one (see "Replacing the imaging unit" on page 51).
If white vertical streaks appear on the page:
• The surface of the LSU part inside the machine may be dirty. Clean the inside of your machine (see "Cleaning the machine" on page
53). If these steps do not correct the problem, contact a service representative.
Black background If the amount of background shading becomes unacceptable:
• Change to a lighter weight paper.
• Check the environmental conditions: very dry conditions or a high level of humidity (higher than 80% RH) can increase the amount
of background shading.
• Remove the old imaging unit and install a new one (see "Replacing the imaging unit" on page 51).
• Thoroughly redistribute the toner (see "Redistributing toner" on page 45).
Toner smear • Clean the inside of the machine (see "Replacing the toner cartridge" on page 47).
• Check the paper type and quality.
• Remove the old imaging unit and install a new one (see "Replacing the imaging unit" on page 51).
Condition Suggested Solutions