I have no dial tone on my fax machine and i cant send or receive faxes

Be sure thephone line is in the "line" plug, not the "ext" plug on the back of the machine.

Dear
Connect the telephone line to the LINE socket of the fax machine and a telephone receiver unit to the EXT socket of the fax machine.

To send a fax, put the document on the platen glass (face downward) or face upward in case of ADF.
press on hook dial, (here the dial tone on machines speaker)
dial the fax no. ( wait for call connection and here the fax Rx. tone)
press START.

To receive a fax two procedure can made, manual- lift a hand set of telephone receiver on incoming ring, here the TX tone(periodical beep tone) press * 9 * of the telephone receiver. In auto mode go to fax setup select ans. to ring or auto fax etc. to activate atuo reveive of fax.

Hope this may helpful.
Thanks.

Might be silly question but is it setup to auto transmit and receive? And have you tried to operate it manually? + take out the inline filter fax machines operate on volume'db' to soft and it can't hear, to loud and it can distort sound.

Is there a dial tone if you pick up the reciever ? Can you send faxes or use the machine to make a phone call ? If you can make calls or send faxes the machine probably needs to be set to the auto recieve mode so that it automatically answers when a fax is being recieved. If no dial tone you may have a loose connection to your phone jack.

Confirm dialing the correct fax number?

Any 0s to get an outside line, any special area codes?

What happens when you try to send a fax, can you hear a dial tone? can you hear the fax ringing? can you hear a response from the recipiant?

First thing is to ensure that you have dial tone by picking up the handset on the fax machine and listening for dial tone.If there is no handset take a standard house phone and plug it into the jack where the fax machine was inserted. If there is dial tone on the phone then I would advise you to turn the power off the fax for two minutes then power back on. If there is no dial tone on the phone line contact your vendor or local phone carrier and report NO DIAL TONE

Are you sure the line is good? You can try a plugging a telephone into the line to check it.
If you press the "hook button" (or whatever it is called on that machine) do you hear a dial tone?
is the phone cord plugged in snugly and in the proper jack on the machine? Is the cord good?
These are a few things to try.
If all of that checks out, then the phone board on the machine is shot.

Check your fax speed settings, also, make sure you get a good clear dial tone on the line. Sometimes it wont send if it detects line noise.

sleep mode is just a status of the machine when it is in idle mode.you cannot turn this off however you can delay the time before the unit goes into a sleep mode.it has nothing to do when you are sending out faxes.so here are a few things you need to check when sending a fax (1)dial tone by pressing hook/hold button (2) insert the doc into the adf, make sure it will change to "enter fax # and start,or copy press copy (3) dial the number (4) wait for fax tones of the receiving unit before you press start. now if you can hear an operator on the line,that has to be verified with your phone company since brother machine does not restrict incoming and outgoing faxes UNLESS that is restricted from your phone line.