Brother HL-4000CN - page 173

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 Toner Cartridges
The printer uses four toner cartridges: black,
yellow magenta, and cyan.
For the installation procedure, refer to 8.1.2
“Replacing Toner Cartridges”.
 Print Head Cartridge
Consists of the light-sensitive drum, the
developer and the transfer roll.
For the installation procedure, refer to 8.2.2
“Replacing the Print Head Cartridge”.
 Transfer Roll Cartridge
The transfer roll cartridge consists of a transfer
roll and a waste toner collection box.
For the installation procedure, refer to 8.3.2
“Replacing the Transfer Roll Cartridge”.