Brother HL-1650/1670N - Manual (Page 155)

CHAPTER 5 MAINTENANCE
5-15
☛ ☛ ☛ ☛ 5.
Install the Toner cartridge into the new Drum unit until you hear it lock into
place with a click. When the Toner cartridge is installed correctly, the lock
lever is lifted automatically.
Fig. 5-12
!
Caution
Make sure you install the Toner cartridge correctly, or it may separate from
the Drum unit when you pick up the Drum unit assembly.
☛ ☛ ☛ ☛ 6.
Re-install the Drum unit assembly in the printer.
Fig. 5-13