Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have with the printer.
Do you have a printer related problem?
Open Printing Preferences.
The Printer Properties dialog box is typically where you'll find options governing the printer itself - configuring ports, and other hardware-related customizations.
Click (Start button) => Control Panel => Hardware and Sound => Devices and Printers. Right-click your Brother machine icon and select Printer properties.
Click the Basic tab and choose Normal (600 x 600 dpi) for Print Quality, and click Apply => OK.
No this is for Windows pc i will give the Mac instructions.
How old is the printer and how often do you print and what is the minimum pages you print.
Remove the drum unit and Re-install the drum unit and toner cartridges.
Click here to follow picture steps
remote the drums and clean then with a damp and lint free cloth after that check the toner drum it must be having some scratch or damage mark.
Dont forget to clean the corona wire as well.
Carry out calibration to improve the color density
For Macintosh Users:
Perform the calibration from the control panel of the machine