Brother HL 1240 - B/W Laser Printer Service Manual page 270

Note
Both Alarm and Data (Toner) LEDs will blink continuously to indicate that the
toner is nearly empty. This blinking does not stop until you have installed a new
toner cartridge.
The toner cartridge is replaced in the following way. You can also view the toner
cartridge replacement method in the instructional video on the supplied CD-ROM:




1.
Open the front cover. Pull out the drum unit assembly.
!
Caution
It is recommended that you put the drum unit assembly on a piece of disposable
paper or cloth in case of accidental toner spill or scatter.
Do not touch the electrodes shown below to prevent damage to the printer
caused by static electricity.
Fig. 3-2 Removing the drum Unit
Fig 3-3 Electrodes
3-4