Samsung SL-M3870FW User Manual Ver.1.0 (English) - Page 314

Printing quality problems Condition Vertical lines Black or color background Toner smear Suggested solutions If black vertical streaks appear on the page: • The surface (drum part) of the cartridge inside the machine has probably been scratched. Remove the cartridge and install a new one (see "Replacing the toner cartridge" on page 81 , "Replacing the imaging unit" on page 84). 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 91). If these steps do not correct the problem, contact a service representative. 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 toner cartridge and install a new one (see "Replacing the toner cartridge" on page 81). • Thoroughly redistribute the toner (see "Redistributing toner" on page 78). • Clean the inside of the machine (see "Cleaning the machine" on page 91). • Check the paper type and quality. • Remove the toner cartridge and install a new one (see "Replacing the toner cartridge" on page 81). 6. Troubleshooting 314