Brother MFC-9840CDW User Manual page 152

Error Message Cause
If the LCD shows Toner Low,
Toner Low
you can still print; however, the
Prepare New Black(K)
machine is telling you that the
1
Toner Cartridge.
toner cartridge is near the end of
its life and the toner will soon run
1
The toner
out.
cartridge color
which is near the
end of life is
shown in the
message.
There are too many files stored
Too Many Files
on the USB flash memory drive.
Unusable Device An incompatible or broken device
has been connected to the USB
direct interface.
Waste Toner Full It is time to replace the waste
toner box.
Wrong Paper Size The paper in the tray is not the
correct size or the tray is empty.
136
Action
Order a new toner cartridge now for the toner
cartridge color that is low.
Reduce the number of files stored on the USB
flash memory drive.
Remove the USB flash memory drive from the
USB direct interface.
Replace the waste toner box. (See Replacing
the waste toner box on page 185.)
Load the correct size of paper in the tray.