What is the sign for the printer drum needs to be replaced?
How to Replace a Toner Cartridge and Drum Unit in a Brother Laser Printer – Printer Guides and Tips from LD Products
How to install a Brother TN-760 Toner Cartridge?
How to Manual Reset TN760 Replace Toner Error on Brother HL-L2395DW, MFC-L2350DW, MFC-L2750DW | A step-by-step troubleshooting guide to manually reset "Replace Toner" error message on printer after installation of new TN760