Question about Brother IntelliFax-2820 Laser Fax

1 Answer

Fax machine phone connections

I'm new to this forum, hopefully you can help or direct me. As a tech trainer I often disseminate information to our techs. We have been installing digital phone to business and residential customers for quite some time. Occasionally we encounter problems with older fax machines that are sensitive to the polarity of the phone connection, the red and green wires(tip & ring) connected backwards. But a new issue is circulating about using a 4 wire silver satin phone cord to connect to the fax machine rather than the two wire cord (usually provided). If a 4 wire connector is used, are the outside wires (yellow & black) acting as antennas causing the fax machine to become confused? Or is there another explanation why a 4 wire connector on some fax machines would cause malfunction? Thank you very much,.

Posted by on

  • Bill G
    Bill G Jan 30, 2008

    Thanks for the quick response. This situation does not apply to a specific occurance - trying to "nip it in the bud" as other explanations pop up. In any case other than an installation error the outside pair of wires should not be grounded. eMTAs allegedly ( I haven't measured it yet) put out -48 vdc on both telephone lines although only one may be active. The two lines are supplied from a primary port on 4 wires, red, green, black, yellow. (I could see a problem if there is unexpected voltage on the second pair of wires) However, if the eMTA goes directly to a network interface device for distribution and does not connect the outside pair (for non-active line2) and a 4 wire cord is connected to the fax machine - is this a known potential problem to introduce spurious interference that would disable the fax machine?

  • Bill G
    Bill G Jan 30, 2008

    Thanks for the basic phone install procedures.

    If you run across anything about how a 4 wire silver satin cord with the secondary pair improperly or not connected to anything and affecting the fax operation, I would be interested.


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An user who is expert in 3 categories / brands.

  • Brother Master
  • 1,362 Answers

I beleive it's because they are grounding out on the fax, which then resets some of the functions.

Did you measure if there are any activity on those two lines?
V or Hz?

Posted on Jan 30, 2008

  • CheckitRight
    CheckitRight Jan 30, 2008

    The best procedure is to test each outlet before disconnecting the incumbent phone service provider. Go to each outlet, unplug any phone or wire, and use a butt set or a phone you know is working to check for dialtone and the ability to dial out. Document your findings on a room-by-room basis, indicating pass or type of failure mode.
    Once your service is installed and you’ve checked for dialtone at the embedded multimedia terminal adapter (EMTA) before it is connected to the customer’s wiring, you can verify service at each outlet. Begin by disconnecting all phones from outlets to isolate any potential problem in customer premises equipment (CPE - phones, fax machines, etc.) that might feed back into the customer’s wiring. This is particularly pertinent if noise on the line is a problem for the installation site.

    At each outlet, check for availability of dialtone, the ability to dial a number, and the clarity of a telephone connection. Once again, your best test tool for doing this is the butt set, but a known working phone will do most of the job in a pinch.
    On outlets where dialtone is present, verify that dial tone can be removed (broken) as soon as a number is dialed. This is a special testing scenario where just dialing on your butt set or a working phone will not reveal a problem. Failure to break dialtone is caused by the wire pair being reversed at a connection point. Newer phones and test sets automatically detect and compensate for this condition, but it may cause problems later with older or low cost phones and other equipment, such as fax machines.


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

It does not produce a dialing tone and it doesn't fax nor recieve

Here are some things to check:
1. Is the unit attached to a direct line (not one that goes through a local PBX)? Many fax machines have problems with internal connections.

2. Is the phone line connected to the proper port? The port for the external phone normally will have a picture of a handset. The other port is used to connect to the phone outlet.

3. Try a new phone cable between the fax and the phone outlet.

Here is a link to the user manual if you do not have one:

Apr 29, 2015 | Brother Mfc-8220 Laser Multi-Function...

1 Answer

Sending fax error message."Phone

No. Most of the time this "phone line error" can be caused by the telephone connection or issue on the phone line where the fax machine is connected.
Hope this will help.

Mar 27, 2011 | Office Equipment & Supplies

1 Answer

Change incoming fax number

Unless I'm misunderstanding your question, your fax machine has nothing to do with the incoming fax number. That's assigned by your phone service provider to the telephone line the fax machine is connected to. The only way to change that number would be connect the machine to a different phone line. This might be as simple as just plugging the phone cord into another jack if that line already appears at a convenient location, or it might mean a visit from a technician to place a jack where it's needed. Or you can contact your phone service provider about assigning a new number.

I hope this has helped. If not, please post a comment with more information about your question and I'll try to help further.

Oct 11, 2010 | Canon FAX-L800 Plain Paper Laser

1 Answer

No dial tone on phone connected to ext port on epson dx9400f

Buy a double adapter so both cords go to the LINE port. Set your answering machine to 6 or 7 rings so the fax picks up first. Your fax machine will know the difference between voice and fax calls,

Jun 22, 2010 | Pitney Bowes 9920 Plain Paper Fax

1 Answer

When machine was moved from one line to another it now gives a "handset" error message in the window constantly after you try to dial in a number and use the fax machine; the communications tech. says it...

Your fax tech is correct. There is another device on your fax line such as a credit card machine, a postage meter, computer, etc.

You should have a dedicted analog phone line for your fax machine.

Oct 12, 2009 | Ricoh Aficio 1515F Plain Paper Laser Fax

2 Answers


>first run fax test, press set up go to tools menu then select run fax test,all entries should be pass
>then check your connections, do you have one line or number for your fax and phone?or a separate line or another number for fax and another number for phone?
>let me assume you only have one number for fax and phone..
>check connections, this should be downstream connection, the fax machine using the black phone cord provided by hp should be connected directly to the phone jack using line 1 at the back of the fax and the answering machine or the telephone should be connected to ext 2 or line 2 at the back of the fax...there should be no other devices phone or answering machine connected directly to the phone jack.
>next set rings to answer on the fax machine higher than the answering machine...if your rings to answer on answering machine is 4 rings, set the fax to 6 rings...if it is a voice call the answering machine will pick it up at 4 rings then if it detects that it it a fax tone then it will transfer the call to fax.
>also check if auto answer is on in your fax
>you can check auto answer and rings to answer by pressing set up or menu button on your machine look for it in basic fax settings or advance settings
>also check if your voice prompt for your answering machine is not too short there should be like at least 5 seconds after cutting your message to allow the machine to transfer the call to the fax if it is a fax tone.

Sep 14, 2009 | HP 1040 Plain Paper Inkjet Fax

1 Answer

Brothers fax machine can't send out faxes

try calling brother tech support  1-908-704-1700 good luck brother tech

Jan 05, 2009 | Brother MFC-8220 Fax

2 Answers

Canon MP830 - Outgoing fax dialing not connecting

Are you plugged into the LINE port of the fax machine?

Oct 21, 2008 | Canon FAX-B820 Plain Paper Bubblejet

1 Answer

Still can't get fax not to pick up when answering machine is connected.

if you have the fax-575 there should be a TAD setting.

This is the setting you would use if you're using an answering machine on the same phone line as your fax machine.

To set the Recieve Mode :

Press Recieve Mode. The LCD display shows your current selection.

Continue to press Recieve Mode until your new selection appears. After 2 seconds the screen returns to the date and time display, along with your new Recieve Mode setting.

The 4 Recieve modes are Fax Only, Fax/Tel, TAD:Answering Machine, Manual.

Hope this helps!!!

Jan 30, 2008 | Brother FAX-575 Plain Paper Thermal

1 Answer

Brother mcf-440cn



 Must have DSL filter attached before fax, not sure how you are saying you have it setup, but phone line should come from wall then to filter then to fax socket marked line, phone should be hooked to socket on fax marked EXT, if you dont have dedicated fax line then fax number will be same as phone no.


If you have Adsl then there will be a lead from wall that splits into two, one goes to your modem (ADSL) and the other marke phone or line needs to go to fax socket marked LINE

Oct 21, 2007 | Office Equipment & Supplies

Not finding what you are looking for?
Brother IntelliFax-2820 Laser Fax Logo

674 people viewed this question

Ask a Question

Usually answered in minutes!

Top Brother Office Equipment & Supplies Experts


Level 3 Expert

1362 Answers


Level 3 Expert

1113 Answers

Ron Dufek
Ron Dufek

Level 3 Expert

398 Answers

Are you a Brother Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides