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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-8155DN, HL-5440D, HL-5450DN, HL-5470DW, HL-6180DW, HL-L2300D, HL-L2305W, HL-L2340DW, HL-L2350DW, HL-L2365DW, HL-L2375DW, HL-L2380DW, HL-L2395DW, HL-L5100DN, HL-L5200DW, HL-L6200DW, HL-L6400DW, MFC-8510DN, MFC-8910DW, MFC-8950DW, MFC-L2700DW, MFC-L2703DW, MFC-L2710DW, MFC-L2713DW, MFC-L2720DW, MFC-L2730DW, MFC-L2740DW, MFC-L2750DW, MFC-L5755DW, MFC-L6700DW, MFC-L6900DW