Brother DCP-J552DW Service Manual page 236

■ Rubber key panel model
<Operating Procedure>
(1) When the machine is on standby, press the [Menu], [Mono Start], and [Menu] keys in order.
The LCD will display "0" and the machine will enter end-user accessible maintenance mode.
(2) To select one of the maintenance mode functions, use the numerical keys to directly input the
maintenance mode you want to use.
(3) When each of the maintenance mode functions is completed, the machine automatically returns
to standby.
Note To stop the procedure midway and return the machine to standby, press the [Stop] key.
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