Brother DCP 1000 - Manual (Page 114)

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YL4DCP-1000-FM5.5
Toner Empty Indicator
When the toner cartridge is running low, the LCD shows TONER LOW and
the Toner Empty LED on the control panel flashes on and off to indicate the
toner is low.
The Toner Empty LED light stays on and the LCD shows TONER EMPTY to
indicate that the toner is empty. Once this indication appears, the DCP will not
resume printing until you have installed a new toner cartridge.
WARNING
Just after you have used the DCP, some internal parts of the machine will be
extremely HOT! So, please be careful.
Display Toner Empty Icon