Brother HL-1240 - Manual (Page 68)

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4.
Install the toner cartridge into the new drum unit until it locks into place, indicated
by a click. When the toner cartridge is installed correctly, the lock lever is lifted
automatically.
!
Caution
Make sure that the toner cartridge is installed correctly, or the toner cartridge may
separate from the drum unit when you hold the drum unit assembly.
Fig.3-16 Install the toner cartridge into the drum unit
5.
Install the drum unit assembly into the printer.
Fig. 3-17 Installing the drum unit
Make sure that the printer is turned on, the front cover is open and the Drum and
Alarm LEDs are illuminated.
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