Brother MFC-9140CDN Basic User's Manual page 133

Error Message
Unusable Device
Remove the Device.
Turn the power off
and back on again.
Unusable Device
USB
Write-protected
WT Box End Soon
Cause
A defective USB device or a
high power consumption USB
device has been connected to
the USB direct interface.
A USB device or USB Flash
memory drive that is not
supported/is encrypted has
been connected to the USB
direct interface.
The protect switch of the USB
Flash memory drive is on.
The waste toner box is near the
end of its life.
Action
Unplug the device from the USB direct
interface. Press and hold down
machine off, and then turn it on again.
Unplug the device from the USB direct
interface (see the specifications for supported
USB Flash memory drives in Printing data from
a USB Flash memory drive or digital camera
supporting mass storage (For MFC-9330CDW
and MFC-9340CDW) on page 60).
Turn off the protect switch of the USB Flash
memory drive.
Buy a new waste toner box before you get a
Replace WT Box message.
Troubleshooting
to turn the
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