Brother HL 4150CDN - Manual (Page 109)

Routine Maintenance
103
5
f
Hold the handle of the toner cartridge and slide it into the appropriate colored section of the drum unit
until it clicks into place.
g
Make sure the green lock lever (1) is in the release position as shown in the illustration.
h
Match the guide ends (2) of the drum unit to the c marks (1) on both sides of the machine, then gently
slide the drum unit into the machine until it stops at the green lock lever.
C - Cyan
M - Magenta
Y - Yellow
K - Black
C
M
Y
K
1
1
2