Brother HL 1240 - B/W Laser Printer Service Manual page 278

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.
Make sure that the printer is turned on, the front cover is open and the Drum and
Alarm LEDs are illuminated.
Fig. 3-17 Installing the drum unit
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