Brother DCP-9020CDW Basic User's Manual page 76

h
Put the belt unit back in the machine.
68
i
Slide each toner cartridge and drum unit
assembly into the machine, making sure
you match the toner cartridge colours to
the same colour labels on the machine.
BK = Black, C = Cyan,
M = Magenta, Y= Yellow
j
Close the top cover of the machine.
BK
C
M
Y