These printers use the TN850 cartridge:
Brother DCP L-5500-DN
Brother DCP L-5600-DN
Brother DCP L-5650-DN
Brother DCP L-6600 DW
Brother HL L-5000-D
Brother HL L-5100-DN
Brother HL L-5200-DW
Brother HL L-5200-DWT
Brother HL L-6200-DW
Brother HL L-6200-DWT
Brother HL L-6250-DW
Brother HL L-6300-DW
Brother HL L-6400-DW
Brother HL-L 6400-DWT
Brother HL L-5100 DNT
Brother HL L-6250 DN
Brother HL L-6300 DWT
Brother HL L-6400 DWG
Brother HL L-6400 DWX
Brother MFC L-5700-DW
Brother MFC L-5800-DW
Brother MFC L-5850-DW
Brother MFC L-5900-DW
Brother MFC L-6700-DW
Brother MFC L-6750-DW
Brother MFC L-6800-DW
Brother MFC L-6900-DW
Brother MFC L-5700 DN
Brother MFC L-5750 DW
Brother MFC L-6800 DWT
Brother MFC L-6900 DWG
Brother MFC L-6900 DWT
Brother MFC L-6900 DWX
Brother MFC L-6950 DW