Brother DCP-6690CW, Service Manual, Page: 439 / 506

App. 4-9 Confidential
• Selectors 1 through 3: 1st dial tone detection
These selectors activate or deactivate the 1st dial tone detection function which detects the
1st dial tone issued from the PSTN when a line is connected to the PSTN.
Setting all of these selectors to "1" activates the dial tone detection function so that the
machine starts dialing upon detection of a dial tone when a line is connected. (However, in
those countries which support no dial tone detection function, e.g., in the U.S.A., setting
these selectors to "1" makes the machine start dialing after a WAIT of 3.5 seconds.) For the
detecting conditions of the 1st dial tone, refer to WSW07 and WSW08.
Other setting combinations deactivate the dial tone detection function so that the machine
starts dialing after the specified WAIT (3.5, 7.0, 10.5, 14.0, 17.5, 21.0, or 24.5 seconds)
without detection of a dial tone when a line is connected to the PSTN.
• Selector 4: Max. pause time allowable for remote ID code detection
This selector sets the maximum pause time allowable for detecting the second digit of a
remote ID code after detection of the first digit in remote reception.
If selector 4 is set to "0" (2 seconds), for instance, only a remote ID code whose second
digit is detected within 2 seconds after detection of the first digit will become effective so
as to activate the remote function.
• Selectors 5 and 6: Busy tone detection in automatic sending mode
These selectors determine whether or not the machine automatically disconnects a line
upon detection of a busy tone in automatic sending mode.
Setting selector 6 to "0" ignores a busy tone so that the machine does not disconnect the
line.
Setting selectors 5 and 6 to "0" and "1," respectively, makes the machine detect a busy tone
only after dialing and disconnect the line.
Setting both of selectors 5 and 6 to "1" makes the machine detect a busy tone before and
after dialing and then disconnect the line.
• Selector 7: Busy tone detection in automatic receiving mode
This selector determines whether or not the machine automatically disconnects the line
upon detection of a busy tone in automatic receiving mode.