Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble, Marcia.
What is the make/model of the fax system?
Are you able to receive faxes?
I can't send you one directly, I don't have a fax machine handy at the moment, sorry.
Chances are this is a comcast issue though, faxing does not work well (or at all) over digital (cable) phone lines, they were not designed to support analog devices like fax machines.
First, make sure the cord from the wall/phone jack to the brother is on the #1 (line) port, not the #2 (ext/tad) port.
Next, go into the fax settings menu, under compatibility mode, and set it to VOIP mode, then try to fax again.
You can send a test fax to(###) ###-####and it will send an automated reply fax back.
You may actually not see it as VOIP, but look for a setting for basic, or if you don't see that, set the transmit speed to the lowest option, disable error control ECM, and/or turn on "overseas" mode.