Brother MFC640CW Service Manual page 310

(3) MFC820CW/640CW
Press the * and # keys at the same time when the machine is on standby. T he firmware
version appears on the LCD.
DCP340CW
Press the Me nu and Mono Start keys. Next press the
machine enter the maintenance mode.
Press the key several times to display 8 on the LCD and then press the Se t key. Again
press the key several times to display 0 and press the Se t key. (See Chapter 8, Section
8.4.21.)
Press the Mono Start key several times to display the firmware version.
In this example, if "A0307252244:CF30" appears, it means that the loading operation has
been successfully finished.
(4) If loading operation finishes abnormally, turn the machine off and on. T he machine
automatically enters the load mode and emits a large beep. Perform the loading procedure
above again.
Ap p. 2-6
key four times to make the
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