Brother DCP-L8400CDN Service Manual page 421

1.3.19 Acquisition of white level data and setting of CIS scanning area
(Function code 55)
<Function>
This function is used to acquire the white level of CIS scanner and save it together with the
scanning area into EEPROM of the main PCB.
<Operating procedure>
(1) Press the 5 key twice in the initial state of the maintenance mode. "Press START" is
displayed on the LCD.
(2) Press the Mono Start key. "SCANNER AREA SET" is displayed on the LCD and the white
level data is acquired.
(3) After a few seconds, the machine saves the correction of the white level data/scanning
width in the EEPROM, and returns to the initial state of the maintenance mode. If an error
is detected during this operation, the message "SCANNER ERROR" is displayed on the
LCD for single-side scanning model, and the message "SCANNER ERR ADF" or
"SCANNER ERR FB" is displayed on the LCD for duplex scanning model.
If this occurs, press the X key to return the machine to the initial state of the maintenance
mode.
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