The MFC-L8900CDW is printing faded colors. How can I fix this?

Faded colors usually point to low toner levels, incorrect print settings, or a dirty transfer roller. Verify the toner levels in each cartridge. Adjust the print quality settings to 'High' or 'Best' in your printer driver. Clean the transfer roller as described in the previous answer. Also, ensure you're using compatible and high-quality toner cartridges.