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I know it sounds foolish, but be sure the phone jack you're plugging in to actually has dialtone. Make sure the line cord you're using is good, and is firmly plugged in until the latch snaps in. Sometimes the plug may seem like it's in but isn't making a good contact.
If it still says there's no dialtone, try reinstalling the modem drivers. Then start looking for a replacement modem.
Remove the phone line from the back of the fax and connect a standard phone (not a business PABX or PAX system phone) to the line. Ensure dialtone is available. (Make sure in doing this that you are also testing the cable from the phone socket to the fax). If no dialtone, replace cable or fix line.
Check that the line is connected to the 'line' port on the fax, not the 'phone' port.
If still no dial tone, it may be modem fault (in the fax). Seek specialist attention.
Make sure the same dial tone you can talk on is plugged into your fax machine. Try plugging a plain old telephone into the wall jack your fax is plugged into. Until you hear dialtone in that jack, don't bother troubleshooting the fax any more.
I must tell you that this is not a printer issue, since printer does not have inbuilt fax capabilities....Actually you are trying to send fax from the computer using a Data Fax Modem. Printer just used for scanning and printing documents for fax...
1. Please check if your computer have Fax modem. Look at the back of the system tower, if you see a phone jack port (probably two of them).
2. If yes then , you need to have a telephone cable directly from wall (not the ethernet cable coming from DSL modem), fax works on analog signals which is possible only from telehone line.
If your phone line is working, there is no chance the it will give you error again for NO Dial tone
You cannot send a fax on a broadband connection, they should have given you a splitter, if not get one, the splitter is a small box like thing, it has two telephone sockets on one side and one socket on the other, the telephone line from the wall is connected on one side, on the other side you have to connect your adsl modem in one and your telephone in another socket, Usually the sockets have descriptions on them specifing which decive should be connected to the socket.
Now you should have a dial up modem(56Kbps internal or external modem) connect this modem to the socket which specifies, Telephone. Configure the modem. configure yor fax settings to use this modem. Now you can send your faxes.
If your ISP does not support dial-up then you cannot use it to send faxes.
The error 680 means There is no dial tone.
The modem is not detecting a dial tone
There are many possible causes of a No Dial Tone Error.
1.Check cable is correctly inserted into back of modem and phone socket
2.Check properties of connection, make sure correct modem is being used
3.Disable "wait for dialtone before dialing" in My Computer > Dial Up Networking > Properties of Connectoid > Configure > Connection > remove checkmark under call preferences
4.Try removing fax machines or other devices connected to the line
5.Make sure no one is using the telephone when trying to connect