iFixit - Answers With Device "ATT CL4940"

ATT CL4940: Can't Tilt Screen, feels like it will break if I do.

Fri, 21 Jun 2024 10:36:07 -0700

I tried to tilt the screen, but it resists strongly. I fear breaking this fine phone. I pulled it up about as far as I could without breaking something and stuck a piece of wood to hold it there, but that is an unsatisfactory answer. Is there some trick to it?

⟐ Answered June 21, 2024 at 10:36 MST

ATT CL4940: My phone won't ring on incoming calls

Sun, 08 Feb 2026 14:51:39 -0700

Phone has dial tone and I can call other people but it won't ring when they call even tho the caller hears ringing. On thier side

⟐ Answered February 08, 2026 at 14:51 MST

ATT CL4940: will not hang up

Tue, 21 Oct 2025 07:09:04 -0700

The line disconnect micro switch checks ok but the phone will not hang up from the land line, it does however show normal display responses to the hang up switch. It will just not disconnect from the land line.

When I replace the handset in the cradle the conversation will not disconnect. If I disconnect the landline from the phone the conversation will disconnect. If I reconnect the landline with the phone hung up I can hear a dial tone and then after a while a continually busy signal . Calling my landline with the cl4949 connected produces a busy signal . Is there a switching transistor in the circuit of the 4940 that is leaking?

I can use the phone as long as I physically remove the landline to hang up. The landline must remain disconnected or the line will lock up and no other phone in my home will work. With the 4940 disconnect from the landline all my other phones work ok.

Thanks,

Robert

Speaker button checks Ok with an ohmmeter. This problem with the line control started after an electrical storm. Does anyone have an electrical diagram?

Thanks,

Robert

⟐ Edited by author October 21, 2025 at 7:09 MST

ATT CL4940: Why does the phone ring when I cough?

Mon, 26 Feb 2024 07:31:42 -0700

If I’m not using the phone, and a loud noise occurs in the room. A sneeze, cough or other loud noise. The phone starts ringing until I pick up the handset and hang it up. Why?

⟐ Commented February 26, 2024 at 7:31 MST

ATT CL4940: Why is my device not recording any messages?

Fri, 23 Apr 2021 05:49:29 -0700

When I miss a call, the device will not record or save any of the messages people leave. What should I do?

⟐ Answer deleted April 23, 2021 at 5:49 MST

ATT CL4940: How can I get to make this phone give the maximum amount of incoming r

Mon, 09 Feb 2026 00:55:46 -0700

How can I get to make this phone give the maximum amount of incoming rings.

⟐ Answer edited February 09, 2026 at 0:55 MST

ATT CL4940: Why ongoing calls hang up when Speaker button pressed?

Tue, 19 Mar 2024 12:37:22 -0700

With our CL4940 during an ongoing call, pressing Speaker and placing the handset in the base hangs up the calll, even though the instructions say this is what to do. Do you see the same issue? Or do you know of any workarounds?

⟐ Answer accepted March 19, 2024 at 12:37 MST

ATT CL4940: Phone cradle holder broken

Wed, 04 Jan 2023 08:15:22 -0700

The plastic that the phone in the cradle attaches to broke. It slides up and down and removes easily. Can it be e replaced

⟐ Answered January 04, 2023 at 8:15 MST

ATT CL4940: Adding an additional phone?

Mon, 10 Oct 2022 15:06:58 -0700

Is there a model stand alone cordless that I can buy for my CL4940 Landline. I just want another phone in my guestroom

⟐ Answered October 10, 2022 at 15:06 MST

ATT CL4940: How do I change the remote access code

Thu, 19 Mar 2020 00:43:15 -0700

how do I change the remote access code

⟐ Answered March 19, 2020 at 0:43 MST

ATT CL4940: Can't respond with keys to messages left

Mon, 01 Jul 2019 04:47:19 -0700

When I’m left a message & need to respond with an answer (#1, #2, etc.) it doesn’t “take” though I can dial a phone number on key pad without a problem. I don’t have a manual.

⟐ Answer accepted July 01, 2019 at 4:47 MST

ATT CL4940: Why are parts of the numbers on the screen don’t appear

Sat, 22 Jun 2019 10:40:41 -0700

Why are parts of the numbers missing on the screen?

⟐ Answer accepted June 22, 2019 at 10:40 MST

ATT CL4940: Can notget the message recorder to record a message whhten phone rings

Fri, 21 Jun 2019 04:43:50 -0700

answer machine does not record when turned on

⟐ Answer accepted June 21, 2019 at 4:43 MST

ATT CL4940: Phone won't dial a contact in the directory.

Wed, 18 Feb 2026 12:15:00 -0700

Clearly a problem. Have disconnected power and plugged back in but no joy. I have a dial tone and if I enter the number manually then it will make the call.

All and any suggestions / tips will be appreciated.

Mike

ATT CL4940: Caller ID stopped working

Thu, 22 Feb 2024 02:45:38 -0700

Caller ID stopped working

⟐ Commented February 22, 2024 at 2:45 MST

ATT CL4940: Why does the display have CL4940 on it?

Wed, 13 Jun 2018 16:41:20 -0700

My display has the date and time, but why does it display the model number of the phone? Is there a way to turn it off?

ATT CL4940: No AC Power, Etcetera, when Adapter Plugged In

Tue, 11 Jul 2017 08:38:51 -0700

When I plug the adapter into the wall socket while not picking up the receiver, the screen says: "No AC Power".

There is also no dial tone when I pick up the receiver.

Yet, then I disconnect the adapter, the dial tone sounds.

Moreover, when I pick up the receiver while the adapter is unplugged, from the wall socket, there is a dial tone. I can plug the adapter into the wall socket, while holding the receiver, too, and the dial tone remains.

Any thoughts on the problem and a fix?

ATT CL4940: blacklit screen is blank on ATT CL4940

Wed, 04 May 2016 13:57:05 -0700

how do you replace a blank backlit screen on an ATT Cl

4940?