Brother HL-7050 Series User Manual page 158

4
Unpack the new drum unit.
Wait to unpack a drum unit until immediately before you
put it in the printer. Exposure to direct sunlight or room
light may damage the drum unit.
Do not touch the shaded parts shown in Figure 5-14.
5
Put the toner cartridge in the new drum unit. If you put the
cartridge in properly, the blue lock lever is lifted automatically.
Make sure you install the toner cartridge properly, or it may
separate from the drum when you pick up the drum unit.
Figure 5-14
Figure 5-15
ROUTINE MAINTENANCE 5 - 9