Brother HL-3150CDN User Manual page 168

Troubleshooting
Error message
Size Mismatch
Small Paper
Toner Error
Toner Low: X
(X shows the toner
cartridge or drum unit
colour that is near the
end of its life. BK=Black,
C=Cyan, M=Magenta,
Y=Yellow.)
WT Box End Soon
Cause
The paper in the indicated tray is not
the correct size.
The paper size specified in the
printer driver is too small for the
machine to deliver it to the Face-
down output tray.
One or more toner cartridges are
not installed correctly.
If the LCD shows Toner Low you
can still print; however, the machine
is telling you that the toner cartridge
is near the end of its life.
The waste toner box is almost full.
Action
Put the same size paper in the paper tray that is
selected in the printer driver, and then press Go, or in
the printer driver select the size of paper that you
loaded in the indicated paper tray.
Open the back cover (face-up output tray) to let the
printed paper out on the face-up output tray and then
press Go.
Pull out all the drum units. Take out all the toner
cartridges, and then put them back into the drum
units.
Order a new toner cartridge now so a replacement
toner cartridge will be available when the LCD shows
Replace Toner.
Order a new waste toner box before you get a
Replace WT Box message.
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