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Please check the following points to solve the problem:
Make sure that foreign material such as a torn piece of paper, sticky notes or
dust is not inside the machine and around the drum unit and toner cartridge.
The toner cartridge may be damaged. Put in a new toner cartridge.
Please refer to the instructions, "Replace Toner".
The drum unit may be damaged. Put in a new drum unit.
Please refer to the instructions, "Replace Drum".
DCP-L2535DW, DCP-L2540DW, DCP-L2550DW, HL-5440D, HL-5450DN, HL-5470DW, HL-6180DW, HL-L2360DN, HL-L2365DW, HL-L2375DW, HL-L5100DN, HL-L6200DW, HL-L6400DW, MFC-8510DN, MFC-8910DW, MFC-L2700D, MFC-L2700DW, MFC-L2715DW, MFC-L2740DW, MFC-L2750DW, MFC-L2770DW, MFC-L5700DN, MFC-L5900DW, MFC-L6900DW