Brother DCP1200 - Manual (Page 127)

11 - 15 T R O U B L E S H O O T I N G A N D R O U T I N E M A I N T E N A N C E
Toner Empty Indicator
When the toner cartridge is running low, the display shows TONER LOW
and the Toner Empty icon on the control panel flashes on and off to
indicate the toner is low.
Display
Toner Empty Icon
The Toner Empty icon appears and the display shows TONER EMPTY.
Once this icon appears, your machine will not resume printing until you
install a new toner cartridge.
How to Replace the Toner Cartridge
WARNING
Just after you use the machine, some internal parts of the machine will be
extremely HOT! So, never touch the shaded parts shown in the
illustration.
HOT!
1 Open the front cover and pull out the drum unit.