Brother DCP-9055CDN Service Manual page 532

(11) If the Brother maintenance USB printer driver is successfully installed, the following
message screen appears. Click Finish to return.
(12) Repeat the steps from (9) to (11) three times, and then complete its installation.
(13) Disconnect the USB cable.
(14) Press the or
OK button. The maintenance mode exits from the maintenance mode and return to the
ready state.
button to display "MAINTENANCE 99" on the LCD. Then, press the
App.3-5 Confidential