Brother MFC5890CN Service Manual page 285

(4) Enter "A" using the steps below.
Press the 1 key with the # key held down.
The main PCB gets the MAC address from the WLAN PCB. (This operation backs up the
EEPROM data stored on the WLAN PCB.)
The LCD displays the "E2PCOPY START" once and then returns to the "PLS INPUT
NO.0-b."
NOTE: Pressing the 8 key displays the obtained MAC address like "MAC:
XXXXXXXXXXXX" on the LCD. If an error is detected during the backup operation or
when the 8 key is pressed, the machine displays "E2P BACKUP ERR!!" on the LCD and
becomes inoperable. If it happens, turn the machine off and check the connection between
the WLAN PCB and main PCB, and then go back to step (1).
(5) Press the Stop/Exit key to return to the initial stage of the maintenance mode.
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