Brother HL-1230 EN - Manual (Page 78)

CHAPTER 5 ROUTINE MAINTENANCE
5–6
!
Caution
Install the toner cartridge immediately after you remove the protective cover. Do not
touch the shaded parts in the illustration to prevent any degradation to the print
quality.
6.
Install the new toner cartridge into the drum
unit until you hear it lock into place. When the
toner cartridge is installed correctly, the lock
lever is lifted automatically.
!
Caution
Make sure you install the toner cartridge correctly or it may separate from the drum
unit.