20 Most Recent AT&T 5840 5.8GHz Speakerphone/Answering/Caller ID Answering Machine Questions & Answers

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.

Maybe a mute button is on...volume setting all the way down....? Try calling you number from another phone..See if anything lights up. Bent connection pin in phone base.Try another cord. Trying to help.

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.

You may need to set the main handset to synchronize with the base unit plugged into the telephone wall jack and assign special configuration numbers to the other handsets in order to properly identify each one within a specified location. One handset left in the turned on mode may make it impossible to place calls with the any of the other handsets. This will continue until either the battery dies or fails on the handset or the phone is switched off and replaced in its charger for charging again. Synchronize the main handset by pressing the MENU button on the handset, then pressing the down button IN order to select the number you wish to assign to that handset. Repeating this process if you have already done so will greatly decrease the level of errors experienced with phones.

Answering System Feature Setup
You can set up one feature at a time, or you can set up
a feature and then move on to set up another feature.
1 Make sure the answering system is on.
2 Press and release Uuntil you hear the
system announce the feature you want to set.
Refer to the Feature Summary chart on page 54
for a description of the features and your choices.
3 Press cto hear the feature’s settings.
4 Press Uto move on to the next feature
or press a PLAY/STOP button to exit Feature
Setup.

You can download the pdf format manual on this website:

http://telephones.att.com/telephones_ui/support/dsp_manual.cfm?manualID=261

yo fix it

If you want the manual, just go to http://telephones.att.com/telephones_ui/support/dsp_manuals_list.cfm then scroll down to your model 5840 Manual. It will download the manual for you.

I have same problem how do i fix this

you have a voice mail message

try reseting the phone by unpluging it and also removeing the batterys. Il check the manual.

hello sir

Disconnect power cable and remove battery, it should reset

The processor chip that records the voice is a multi level SMD technology chip. The tech who changes it will need the proper soldering facilities for this type of work.

The only people who can service the phone are the authorized service people for ATT. They will not sell parts to non authorized service people, even if they have the proper facilities to change the chip.

For service on your phone, the service center will normaly change the complete circuit board. If the phone is out of warranty, the cost would not be worth it.


Jerry G.

Either the handset Rxer or the base Rxer is off frequency

you need to reset the cordless phone. This sounds like a lightning strike , if it was the phone is finished. Unplug it , wait 20 seconds and plug it back in again.