Brother MFC-640CW - Manual (Page 56)

3 - 1 SETUP SEND
3
How to enter Fax mode
Before sending faxes, make sure ( Fax ) is illuminated in
green. If not, press ( Fax ) to enter Fax mode. The default
setting is Fax.
How to dial
You can dial in any of the following different ways.
Manual dialing
Press all of the digits of the phone or fax number.
Setup Send