If You Replace The Duplex Unit (For Duplex Print Models); 1 ] Check The Paper Feeding And Ejecting Operations In Duplex Printing - Brother DCP6690CW Service Manual

(4) Enter "A" using the steps below.
Models without touch panel
Press the 1 key with the # key held down.
Models with touch panel
Press the A key on the touch panel.
No MAC address appears on the LCD, but the main PCB gets the MAC address from the
WLAN PCB. (This operation backs up the EEPROM data stored on the WLAN PCB.)
The "E2PCOPY START" appears on the LCD.
NOTE: If an error is detected during the backup operation, 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) again.
(5) Press the Stop/Exit key to return to the initial stage of the maintenance mode.
7.9 IF YOU REPLACE THE DUPLEX UNIT

[ 1 ] Check the paper feeding and ejecting operations in duplex printing

Before starting the operation below, be sure to set A4-size paper in the DX paper tray #1.
(1) Press the Menu and Black Start (Mono Start) keys in this order. Next press the Copy,
Scan, Copy, and Scan keys in this order to make the machine enter the maintenance mode.
(2) Press the 0 key twice.
The "SPECIAL MAINT" appears on the LCD.
(3) Press the 2 and 8 keys in this order.
The "PRESS START KEY" appears on the LCD.
(4) Press the Color Start or Black Start (Mono Start) key.
The "PRINTING" appears on the LCD and the machine performs the paper feeding and
ejecting operations in duplex printing.
(FOR DUPLEX PRINT MODELS)
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