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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-8110DN, DCP-8150DN, DCP-8155DN, DCP-L2520DW, DCP-L2540DW, DCP-L2550DW, DCP-L5500DN, DCP-L5600DN, DCP-L5650DN, HL-5440D, HL-5450DN, HL-5470DW, HL-5470DWT, HL-6180DW, HL-6180DWT, HL-L2300D, HL-L2305W, HL-L2315DW, HL-L2320D, HL-L2340DW, HL-L2350DW, HL-L2360DW, HL-L2370DW(XL), HL-L2380DW, HL-L2390DW, HL-L2395DW, HL-L5000D, HL-L5100DN, HL-L5200DW(T), HL-L6200DW(T), HL-L6250DW, HL-L6300DW, HL-L6400DW(T), MFC-8510DN, MFC-8710DW, MFC-8810DW, MFC-8910DW, MFC-8950DW, MFC-8950DWT, MFC-L2680W, MFC-L2685DW, MFC-L2690DW, MFC-L2700DW, MFC-L2705DW, MFC-L2707DW, MFC-L2710DW, MFC-L2717DW, MFC-L2720DW, MFC-L2730DW, MFC-L2740DW, MFC-L2750DW(XL), MFC-L5700DW, MFC-L5800DW, MFC-L5850DW, MFC-L5900DW, MFC-L6700DW, MFC-L6750DW, MFC-L6800DW, MFC-L6900DW