Brother MFC-L8600CDW User Manual page 131

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
drive that is encrypted or not
supported is connected to the
USB direct interface.
The protect switch of the USB
flash 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 drives in Printing from a USB flash
drive or digital camera supporting mass
storage on page 67).
Turn off the protect switch of the USB flash
drive.
Buy a new waste toner box before you get a
Replace WT Box message.
Troubleshooting
to turn the
119
B