Brother MFC-9450CDN - Manual (Page 183)

Troubleshooting and routine maintenance
167
C
a
Press the front cover release button and
then open the front cover.
b
Hold the green handle of the drum unit.
Lift the drum unit up and then pull it out
until it stops.
c
Hold the handle of the toner cartridge
and pull it out of the drum unit. Repeat
this for all the toner cartridges.