A:AnswerThe Brother DR730 Drum unit is for use with: DCP-L2550DW, HL-L2350DW, HL-L2370DW, HL-L2370DW XL, HL-L2390DW, HL-L2395DW, MFC-L2710DW, MFC-L2750DW, MFC-L2750DW XL.
A:AnswerYes the Brother DR730 is the compatible drum to use with your Brother HLL2390DW machine. You can use the steps below to replace the drum unit:
https://help.brother-usa.com/app/answers/detail/a_id/153747
A:AnswerThe Brother MFC-L2710DW printer works with the high yield TN-760 toner cartridge. For more information, feel free to contact Brother Customer Service directly.
A:AnswerThe toner cartridge on the Brother HLL2370DW must be replaced with a TN730 standard yield, TN760 high yield, or a TN770 super high yield cartridge.
A:Answerlook at the product boxes when you go shopping. it'll tell you what's recommended or what printer the drum is for. seriously.
i googled and this came up for your brother MFC 2685DW PRINTER FOR DRUM: DR 630. I even double checked at amazon and it shows for your printer as well.
good luck.
A:AnswerThe "DRUM" holds excess spent toner so it fills up and needs to be replaced. What doesn't make sense is why Best Buy doesn't sell just the drum (without toner) as it is much less expensive that way.