Brother HL HL-1270N User Manual page 60

4.
Install the toner cartridge into the new drum unit until it locks into place, indicated by a click.
When the toner cartridge is installed correctly, the lock lever is lifted automatically.
!
Caution
Make sure that the toner cartridge is installed correctly, or the toner cartridge may separate
from the drum unit when you hold the drum unit assembly.
Fig. 3-16 Install the toner cartridge into the drum unit
5.
Install the drum unit assembly into the printer.
Fig. 3-17 Installing the drum unit
3-12
This Lock Lever is up
until this position.
X