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Error Message Cause Action
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.
DCP-L3555CDW/DCP-L3560CDW/MFC-L3740CDW/MFC-L3740CDWE/
MFC-L3760CDW/MFC-L8340CDW/MFC-L8390CDW
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.
Ask your administrator to check your Secure
Function Lock Settings.
BT Call Sign On
(For U.K.)
The BT Call Sign setting is on.
You cannot change the Receive
Mode from Manual to another
mode.
Set the BT Call Sign setting to off.
Calibration
Calibration failed.
• Press and hold down to turn the machine
off. Wait a few seconds, and then turn it on
again. Perform the colour correction again
using the LCD.
• Install a new belt unit.
• If the problem continues, contact Brother
customer service or your local Brother dealer.
Cannot Detect
Your machine cannot detect the
toner cartridge.
Remove the toner cartridge and drum unit
assembly for the colour that is indicated on the
LCD. Take out the toner cartridge, and put it back
into the drum unit again. Re-install the toner
cartridge and drum unit assembly back in the
machine.
See Related Information: Replace the Toner
Cartridge.
Cannot Print ##
The machine has a mechanical
problem.
• Press and hold to turn the machine off,
wait a few minutes, and then turn it on again.
• If the problem continues, contact Brother
customer service or your local Brother dealer.
Cannot Scan
The document is too long for
2‑sided scanning.
Press . For 2-sided scanning, use A4 size
paper. Other paper must be within the following
size:
Length: 147.3 to 355.6 mm
Width: 105 mm to 215.9 mm
461
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