Brother MFC-9420CN Service Manual page 179

Even country setting is set already, the customer can change the setting when the machine is turned
on. The procedures below
(1) Press the Menu/Set and Black Start keys. Next press the
machine enter the maintenance mode.
(2) Press the 7 and 4 keys in this order in the initial stage of the maintenance mode.
The current customizing code appears.
(3) Enter the desired customizing code.
OCEANIA version: 2056.
EUROPE version: 2054.
The newly entered code appears.
NOTE: If a wrong 4-digit code is entered, the machine will malfunction.
(4) Press the Black Start key.
The machine saves the setting and returns to the initial stage of the maintenance mode.
(5) To exit the maintenance mode, press the 9 key twice in the initial stage of the maintenance
mode.
6 -3
key four times to make the
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