Brother MFC-9140CDN Basic User's Manual page 89

f
Pull off the protective cover.
IMPORTANT
Put the new toner cartridge in the drum
unit immediately after you remove its
protective cover. To prevent any
degradation to the print quality, DO NOT
touch the shaded parts shown in the
illustrations.
Routine maintenance
g
Put the new toner cartridge firmly into
the drum unit until you hear it lock into
place. If you put it in correctly, the green
lock lever on the drum unit will lift
automatically.
NOTE
Make sure you put the toner cartridge in
correctly or it may separate from the drum
unit.
A
79