Manual mode turns off all automatic answering functions unless you are using the Distinctive¹ feature or you are using an external TAD with the MFC-665CW.

To receive a fax in manual mode press Mono Start or Colour Start when you hear fax tones (short repeating beeps). You can also use the Fax Detect feature to receive faxes by lifting a handset on the same line as the machine.

Also see Fax Detect.

If you use a computer modem or the same line, Faxing will not operate correctly.