Error Message Cause Action
Size Error DX
The paper size specified in the
machine's paper size setting is not
available for automatic 2-sided
printing.
Press Cancel (if required).
Load the correct size of paper in the tray and
set the tray for that paper size.
Choose a paper size supported by 2-sided
printing.
(For models without the lever on the 2-sided
tray) Paper size available for automatic 2-
sided printing is A4.
(For models with the lever on the 2-sided tray)
Paper sizes available for automatic 2-sided
printing are A4, Letter, Legal, Mexico Legal,
India Legal and Folio.
The paper in the tray is not the
correct size and is not available
for automatic 2-sided printing.
Size Mismatch
The paper in the tray is not the
correct size.
Load the correct size of paper in the tray
indicated on the LCD and set the size of paper
for the tray. Press Go.
Toner Low
If the LCD displays this message,
you can still print. The toner
cartridge is near the end of its life.
Order a new toner cartridge now so you have
it ready when the LCD displays Replace
Toner.
Too Many Trays
The number of installed Optional
Trays exceeds the maximum
number.
Reduce the number of Optional Trays.
HL-L6400DW
Error Message
Cause Action
2-sided Disabled
The back cover of the machine is
not closed completely.
Close the back cover of the machine until it
locks in the closed position.
The 2-sided tray is not installed
completely.
Install the 2-sided tray firmly in the machine.
Access Denied
The function you want to use is
restricted by Secure Function
Lock 3.0.
Call your administrator to check your Secure
Function Lock Settings.
Cartridge Error
The toner cartridge is not installed
correctly.
Remove the toner cartridge and drum unit
assembly. Take out the toner cartridge, and put
it back in the drum unit again. Reinstall the
toner cartridge and drum unit assembly in the
machine.
If the problem continues, contact Brother
customer service or your local Brother dealer.
Cooling Down
The temperature of the inside of
the machine is too hot. The
machine will pause its current print
job and go into cooling down
mode.
Make sure you can hear the fan in the
machine spinning and that the exhaust outlet
is not blocked.
If the fan is spinning, remove any obstacles
that surround the exhaust outlet, and then
leave the machine turned on but do not use it
for several minutes.
If the fan is not spinning, disconnect the
machine from the power for several minutes,
then reconnect it.
Cover is Open
The front cover is not completely
closed.
Open and then firmly close the front cover of
the machine.
Cover is Open
The fuser cover is not completely
closed.
Close the fuser cover located inside the back
cover of the machine.
Cover is Open
The Mailbox back cover is not
completely closed.
Close the Mailbox back cover.
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