Brother HL-3140CW User Manual page 191

Troubleshooting
Settings Reset
This operation will reset all the machine's settings back to the settings that were set at the factory:
a
Disconnect the network cable from the machine; otherwise the network settings (such as IP address) will
not be reset.
b
Press a or b to choose Reset Menu. Press OK.
c
Press a and Cancel at the same time. Press OK after Settings Reset appears.
d
Press OK after Restart Printer? appears.
e
The machine will restart automatically.
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