Brother HL-L6300DW Reference Manual page 16

Error Message
Supplies
Replace Drum
Supplies
Toner Low
Cause
It is time to replace the
drum unit.
The drum unit counter was
not reset when a new drum
was installed.
If the LCD displays this
message, you can still print.
The toner cartridge is near
the end of its life.
Action
Replace the drum unit with a new
one.
Reset the drum unit counter.
See the instructions included with the
new drum unit.
Order a new toner cartridge now so
you have it ready when the LCD
displays Replace Toner.
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