A:AnswerToner can sit fine for a long time, but make sure you really shake the cartridge before you put it in to break up any caking or settling that may have occured as this can case clumps that won't allow toner to feed evenly.
A:AnswerMy understanding is both the TN660 and the TN760 are the high volumn toner cartriges compatible with different machines. There is a list of Brother printers on the toner box for which that cartridge can be used. Mine is a HL-L2390dw and the TN760 fits in that machine. Looking at the TN660 box my machine is not listed. So I would not use the TN660.
A:AnswerThis will work with HL-L2300D, HL-L2305W, HL-L2320D, HL-L2340DW, HL-L2360DW, HL-L2380DW, DCP-L2520DW, DCP-L2540DW, MFC-L2700DW, MFC-L2720DW and MFC-L2740DW models.
