Question about AT&T 5840 Cordless Phone

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Delete registration 5840 base unit/5800 handsets

Hi,
I have a AT&T 5840 base unit which is "full" with 6 handsets. Two of my handsets have buttons that don't work so I've purchased a couple of good used ones on ebay for replacement.

Only problem is I've searched online for info to deregister the old handsets and register the new ones. The info I found wasn't complete as it's assuming that base unit has a keypad which mine doesn't.

Does anyone know how to reset or delete the old handsets so I can add the replacements? Thanks in advance!

Belinda
(sorry about the duplicate post where fixya auto added a 5830 unit that shows a base keypad--that is NOT what I have.)

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: DeRegistering a Damaged Cordless Phone????!!!!

If you are still looking for an answer on dereg of a handset, the manual says Menu - 0-0-2 then 3-3-5-OK then select the handset you want to cancel/deregister

Posted on Feb 17, 2008

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  • 518 Answers

SOURCE: unable to register handsets to

From the manual:

1) Before registering the extra handset, the battery pack MUST be charged for 15-20
hours.
2) With the main base in standby mode, press the MENU soft key on the base.
3) Press /vol/∧ or /vol/∨ on the base to select H S R e g i s t r a t i o n, and then
press the OK soft key.
4) On the handset, press and hold # for two seconds. To cancel registration, press
the CANCEL soft key on the base.
5) While the handset is registering, H a n d s e t R e g i s t e r i n g will appear in the Handset
LCD. When R e g i s t r a t i o n C o m p l e t e is displayed, the handset has been registered
to the base. If R e g i s t r a t i o n F a i l e d appears, please try these steps again.


Geno

Posted on Mar 05, 2008

  • 3 Answers

SOURCE: Resetting the Handset

YOU might need to deregister the hand set first by holding down the red end (hang up key) and keep it down while holding the # key. If deregister wont work use base unavailable and yes, you are sure twice.

List the handset numbers of those working handsets
Using a WORKING handset follow these directions
Resetting Handsets
If you want to register the handset to a different base or
replace a handset with another one, you must first clear the
registration information from the base and the handset.
1. Press and hold [ ] and [#] for
at least 5 seconds, until the
SYSTEM RESET menu
appears.
2. Select the DEREGISTER HS
submenu. WHICH HANDSET?
appears in the display.
3. Move the cursor to select the handset ID to be de-registered
from the list, and then press the OK soft key. DEREGISTER HS
appears. CHOSE A NUMBER THAT IS NOT ONE OF YOUR WORKING HANDSETS
4. Move the cursor to select YES, and then press the OK soft key.
When ARE YOU SURE? appears, select YES. You will hear a
confirmation tone.
PUT THE HANDSET IN THE BASE CHARGER AND IT SHOULD REGISTER

Hope This Helps - It worked for me

Posted on Oct 02, 2008

  • 1 Answer

SOURCE: DeRegistering a Damaged Cordless Phone???!!!!

Here is the procedure as given to me by Panasonic Tech Support.

To DEREGISTER, using the handset you want to register, push MENU.....002.......335...and hit ok.
Then press the handset number you want to deregister (1 through 4). Don't worry if the handset says there is no link to base. This is because you just unregistered it so there will be no link.

To REGISTER, press and hold the locator button on the base unit until the green LED starts blinking. Then take the handset unit and press MENU.......001 and hit ok. Your unit should now be registered.

Good luck!

Posted on Feb 16, 2009

  • 1 Answer

SOURCE: nEED TO DEREGISTER LOST HANDSET

I had this problem too. Hold "End" and "#"at the same time fora few seconds and it will deregister. Then just put it on the new base.

Posted on Aug 19, 2009

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1 Answer

How do i sync my panasonic phones cordless kx-tga810


335 is the magic code when you want to remove a previous handset or base station registration!
Handset:

1 " (middle soft key) i L i #

2 Enter "335".

3 "Cancel Handset" i #

LThe numbers of all handsets

registered to the base unit are

displayed.

4 Select the handset(s) you want to

cancel, by pressing the desired handset

number. i #
5 "Yes" i # i {ih}
Base Station:

A handset can be registered to a maximum

of 4 base units. A handset can cancel a base

unit that it is registered to. This allows the

handset to "forget" the base unit.

1 " (middle soft key) i N i #

2 "Registration" i #

3 Enter "335".

4 "Cancel Base" i #

5 Select the base unit(s) you want to

cancel, by pressing the desired base unit

number. i #
6 "Yes" i # i {ih}

Dec 23, 2013 | Panasonic KX TGA810 1Line Cordless...

3 Answers

Phone are 5.8 ghz vtech


may be the frequency problem for noise problem.
pleaSE CHECK IT OUT.
ADJUST THEM AT SOME PROPER LEVEL..
AND THEN TRY.

Oct 18, 2008 | Vtech 5.8 Ghz Handset Cordless Phone...

2 Answers

Can not get the second handset to register to the base


This is the registration procedure

Step 1: press MENU-6 and select 3 “SET BASE”
Step 2: press the REG key on the master base
Step3: press register to finish the registration procedure.
• After the registration complete, handset 11 and handset 21 can
2-WAY intercom with each other

If issue persists reset the unit start registration by using 2nd unit that currently unable to register. if issue continues please inform for further troubleshooting

Good Luck

Jan 01, 2008 | EnGenius SN 920 Ultra Cordless Phone

1 Answer

My phone display's No link to base. Reconnect main bas AC adapter. It is plugged in what now?


I had this problem, and I fixed it by re-registering the phone to the base. Here are the directions for how to do that from the manual:


----->

Registering a handset to the
base unit
The supplied handset and base unit are
pre-registered. If for some reason the
handset is not registered to the base
unit, re-register the handset.
1 Handset:
{MENU}
2 {V}/{^}: "Initial setting"
{OK}
3 {V}/{^}: "Registration"
{OK}
4 {V}/{^}: "HS registration"
{OK}
5 Base unit:
- KX-TG4011 series:
Press and hold {LOCATOR} for
about 5 seconds. (No registration
tone)
- KX-TG4021/KX-TG4071 series:
Press and hold {LOCATOR} for

about 5 seconds until the
registration tone sounds.
If all registered handsets start
ringing, press the same button to
stop. Then repeat this step.
The next step must be completed
within 90 seconds.
6 Handset:
Press {OK}, then wait until a long
beep sounds.
Note:
While registering, "Base in
registering mode" is displayed on
all registered handsets.
When you purchase an additional
handset, refer to the additional
handset's installation manual for
registration.
<-----

See http://service.us.panasonic.com/OPERMANPDF/KXTG4011-MUL.PDF (page 22)

Dec 06, 2011 | Panasonic KX-TG1033S Cordless Phone

1 Answer

Tring to add a handset to a att 5840 base!


The process is called "Registering."

From another fixya post:

1. Make sure to charge the handset battery pack at least 12 hours.
2. Using the soft keys on the base located below the base screen, press MENU.
3. Use the up or down arrow keys to select DISPLAY BASE ID.
4. Press OK. The base screen will display the 15-digit Base ID
code for about 30 seconds, then the unit returns to the idle
screen. Write down the Base ID code on a piece of paper.
5. At the cordless handset, use the soft key to select NEW.
6. Enter the 15-digit Base ID code using the number keypad.
7. Use the soft key to select OK. The screen displays PLEASE
WAIT!.
8. After about 45 seconds, the screen displays FOUND BASE. If the handset displays BASE BUSY TRY LATER, the base is in
use.

Mar 21, 2011 | AT&T 5840 Cordless Phone

1 Answer

Only bass set going extra hand set not working


Hi,


This is because the extra handset might have not been registered with the base unit.The headset should be register to use the headset with that base unit.

To register the handset to base unit please follow the instruction:-

On registration the handset is allocated a handset number for use on the new base unit, the handset numbers are 1-5.

1. Press and hold
d65e3ff.jpgon the base unit until 608a95f.jpgstarts flashing. Registration mode will remain active for approximately 3 minutes.

2.Press and hold both
19efd34.jpg together until you hear a long beep.

3.Select the base unit you wish to register by pressing the corresponding number button 1-4.
4. When PIN is displayed, enter the units PIN number (0000 for this model).
5. If the registration is successful the handset will return to standby mode in a few seconds.


Thanx

Jul 22, 2010 | Doro DECT 540 Cordless Phone

1 Answer

5840 static when answered


change your batteries and realign the base and the handet. poor batteries cause the Txers to drift off frequency

Apr 30, 2008 | AT&T 5840 5.8GHz...

5 Answers

ATT 5840 Base reset code/procedure


document.write(parent.prscreen) Try this to get it working. Relocate the handset(s) closer to the main base.

Check for any lights on the base including charge, intercom, and channel lights (if applicable to the model).

Re-cradle the handset on the base for 15 seconds. Lift the handset and press PHONE.

Unplug the AC adapter from the main base unit and take out the battery from the handset. Leave it unplugged for 15 seconds. Plug the handset battery in and re-cradle the handset. Plug back the AC adapter in and wait for 15 seconds.

Try to de-register the handsets by following the steps below:

1. Using the soft keys on the base located below the base screen, press MENU
2. Press the down arrow once until BASE SETTINGS is highlighted.
3. Press the OK soft key.
4. On the base, press MUTE 3 times and FLASH twice. This will
deregister the unit.

Below are steps on how to re-register the handsets:

1. Make sure to charge the handset battery pack at least 12 hours.
2. Using the soft keys on the base located below the base screen, press MENU.
3. Use the up or down arrow keys to select DISPLAY BASE ID.
4. Press OK. The base screen will display the 15-digit Base ID
code for about 30 seconds, then the unit returns to the idle
screen. Write down the Base ID code on a piece of paper.
5. At the cordless handset, use the soft key to select NEW.
6. Enter the 15-digit Base ID code using the number keypad.
7. Use the soft key to select OK. The screen displays PLEASE
WAIT!.
8. After about 45 seconds, the screen displays FOUND BASE. If the handset displays BASE BUSY TRY LATER, the base is in
use.

Other products that use the 5.8GHz band can interfere with the use of this phone. These products or equipments include: radio towers, page towers, cellular Phones, other 5.8GHz cordless phones, intercoms, or monitors. If any of these are in the area, they may interfere with the performance of the phone. Try relocating the phone.

Video displays, Televisions or Personal Computers can cause
interference on the phone if it is plugged in electrically with one of this equipment (typically on a power strip or extension cord). Please relocate the phone to an AC outlet without any other major appliance plugged in.
You can also relocate the base to another room.

Relocate the phone out of the kitchen area. Appliances may cause interference.

If the charge light does not remain on, clean the handset and base charging contacts using a pencil eraser. If it comes on after cleaning the contacts, you may need to charge the unit for 10 hours.

Make sure that the AC power cord is securely plugged into the base. If unsuccessful, plug the unit into a different known working outlet or turn on the switch on the power strip.

Dec 19, 2007 | AT&T 5840 5.8GHz...

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