My fax machine will send faxes but not receive them. I have made sure it is plugged in and connected but no faxes will come through. Please Help!

Make sure you plugged it back into the right port on the printer itself. The one I have actually has two different phone line plug-in ports - one is for the FAX line that connects to the wall. The other is so you can attach a separte phone as an extention to talk on. Good luck. Also, after it is plugged back into the wall, did you power down, wait 30 seconds and then power back on? Sometimes these things need to recognize at start up whether or not they are connected to other devices, etc. Good luck.

Check if your telephone cable is connected at the " tel " plug on the fax machine

The majority of the time, when you can send but not receive, it is a phone line issue and not the machine. Extremely rare does a machine send and not receive. So here goes the things to try and the reason. 1, Make sure the phone jack is in the "Line" jack and not the external phone jack. Believe it or not, that is the number one issue with sending and not receiving.
Next, plug a phone into the jack that the fax machine is plugged into and see if there is static.
You want to be sure in the fax \settings and advanced settings that the ECM mode is ON, and that Junk Fax ius turned OFF, Junk Fax being on will stop almost all fax from comming in.
Now, the phone line. Here is the explaination of why that can be the problem. When you send a fax, you manually make the connection to the line. When you press send a relay flips and connectes you to the phone line, therefore you have made pretty much a mechanical connection enabling the phone line, and therefore you can send.
Now, when you have an incoming fax, several conditions must me met to make the handshake and therefore connect and receive. These all have to be right in order to properly receive. The phone line voltage mist be high enough, the phone line current must be correct and there can not be much decibel loss over the line. You are making a signal connection, all those conditions must be right to receive a fax. Think of it like a TV remote with batteries that are almost dead, It still send out some signal, but it will not change channels or change the volumn,etc etc. Same principle. If the signal to the incoming fax is weak, chances are it will not connect.

Check the obvious. Is it set to receive auto? Can you lift the handset and hear the fax tone then press the receive button? Make sure the phone line is definitely plugged into th line jack on fax machine.

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You don't need a modem to send/receive a fax.Plug it into the wall jack. Plug the other end into the "line" jack" on the fax machine. That's it.

The majority of the time, when you can send but not receive, it is a phone line issue and not the machine. Extremely rare does a machine send and not receive. So here goes the things to try and the reason. 1, Make sure the phone jack is in the "Line" jack and not the external phone jack. Believe it or not, that is the number one issue with sending and not receiving.
Next, plug a phone into the jack that the fax machine is plugged into and see if there is static.
You want to be sure in the fax \settings and advanced settings that the ECM mode is ON, and that Junk Fax ius turned OFF, Junk Fax being on will stop almost all fax from comming in.
Now, the phone line. Here is the explaination of why that can be the problem. When you send a fax, you manually make the connection to the line. When you press send a relay flips and connectes you to the phone line, therefore you have made pretty much a mechanical connection enabling the phone line, and therefore you can send.
Now, when you have an incoming fax, several conditions must me met to make the handshake and therefore connect and receive. These all have to be right in order to properly receive. The phone line voltage mist be high enough, the phone line current must be correct and there can not be much decibel loss over the line. You are making a signal connection, all those conditions must be right to receive a fax. Think of it like a TV remote with batteries that are almost dead, It still send out some signal, but it will not change channels or change the volumn,etc etc. Same principle. If the signal to the incoming fax is weak, chances are it will not connect.

Promotional faxes are coming through fine everyday. However, we can not receive any of our business faxes. No changes have been made to the fax. Please Help ASAP.

Make sure the fax is set to receive automatically. The receive mode must be set to one of the following modes: Fax Only, Fax/Tel Auto Sw, or Ans Machine. If it is set for Answering Machine, be sure the machine is connected to the fax, turned on, and contains a recorded outgoing message.
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Call your cell phone from the fax machine and check the caller ID to make sure that it is the correct number for your fax machine. Next, call the fax machine from you cell phone, and make sure the fax machine rings. Problems like these are almost always a phone line issue, not the machine.

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In my experience, anything plugged up to a phone line can be some of the most susceptible to electric discharge. Thunderstorms, power surges, brown out, all of these can cripple or kill a fax machine. When I saw this symptom on a fax, 9 times out of 10 it was caused by a power surge of some sort. The line error is most likely the machine's outgoing line has been zapped. The 775 (and it's father, the 770) are some of the most straightforward faxes I have dealt with when it comes to faxing. There is no internal setting that I am aware of that would inhibit the sending of faxes. I would double check the transmission report to make sure that the machine isn't doing something weird like adding extra digits to the numbers you are dialing. It would still be worth your time to try a few things, though. I would plug the fax into another phone jack using a different phone cord if available. Also try using the fax as a telephone, call a number and see if you can connect. If you can, make sure both parties can hear each other clearly. If you can not, the machine will need to be replaced.