Brother HL-1240 - Manual (Page 63)

CHAPTER 3 MAINTENANCE
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5.
Install the new toner cartridge into the drum unit until it locks into place, indicated
by a click. When the toner cartridge is installed correctly, the lock lever is lifted
automatically.
Fig. 3-9 Installing the toner cartridge
into the drum unit
!
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.
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