Brother MFC640CW Service Manual page 311

Afte r re placing the main PCB with the one use d for othe r machine s or whe n updating
program/data
After the installation procedure of the printer driver, proceed to the firmware loading
operation.
If the printer driver has been installed so that you start from loading firmware, unplug the
power cord from the electrical outlet.
Make sure that the machine is connected with your PC using a USB cable.
MFC820CW/640CW
While holding down the 5 key, plug the power cord into an electrical outlet.
DCP340CW
While holding down the Numbe r of Copie s key, plug the power cord into an electrical outlet.
T he machine should show the black and white pattern on the LCD.
NO TE: Never unplug the machine's or PC's power cord or the USB cable during loading.
(1) Run "FILEDG32.exe."
T he Filedrgs window will appear as shown below.
(2) Drag and drop the firmware (e.g., LZ0023_A.upd) onto the BHL2-Maintenance Printer
icon in the Filedrgs window shown above.
NO TE: Use a firmware file after extracting. It is a self-extracting file having the
extension .exe. Double-click the exe file to extract it.
When loading operation starts, the machine beeps intermittently. After approx. 2 to 5
minutes, the loading operation is complete and the machine automatically reboots and
returns to the standby state.
Ap p. 2-7
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