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Error Message Cause Action
or to locate a Brother Authorized
Service Center, visit:
www.brother-usa.com/service
Self-Diagnostic
The temperature of the fuser unit
does not rise to a specified
temperature within the specified time.
• Press and hold to turn off the
machine, wait a few seconds, and
then turn it on again. Leave the
machine idle for 15 minutes with
the power on.
The fuser unit is too hot.
Short paper
The length of the paper in the tray is
too short for the machine to deliver it
to the Face down output tray.
Open the back cover (Face up output
tray) to let the printed page exit onto
the Face up output tray. Remove the
printed pages, and then press Black
Start or Color Start.
Size Error
The paper size defined in the printer
driver is not supported by the defined
tray.
Choose a paper size supported by
the defined tray.
Size Error DX
The paper size specified in the
machine's paper size setting is not
available for automatic 2-sided
printing.
Press Stop/Exit (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.
Paper sizes available for automatic 2-
sided printing are 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 and set the size of paper for the
tray.
Toner Error
One or more toner cartridges are not
installed or not installed correctly.
Pull out the drum units. Remove all of
the toner cartridges, and then put
them back into the drum units.
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 before
the LCD displays Replace Toner.
WT Box End Soon
The waste toner box is almost full. Order a new waste toner box before
the LCD displays Replace WT Box.
MFC-L3710CW/MFC-L3750CDW/MFC-L3770CDW
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.
Access Denied
The function you want to use is
restricted by Secure Function
Lock 3.0.
Ask your administrator to check your Secure
Function Lock Settings.
Calibration
Calibration failed.
• Press and hold down to turn off the
machine. Wait a few seconds, and then turn it
on again. Perform the color calibration again
using the LCD.
• Install a new belt unit.
• If the problem continues, contact Brother
Customer Service or your local Brother dealer.
472
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