AT&T CL4940 Number Pad Replacement and Cleaning

Written By: Nigel Mathias
  • Comments: 2
AT&T CL4940 Number Pad Replacement and Cleaning

Difficulty

Moderate

Steps

7

Time Required

5 - 15 minutes

Introduction

This guide gives step by step instructions on how to access the internals of the number pad on your AT&T CL4940 Corded Answering System. From opening up the device, to removing the motherboard and number pad board, this guide will help you fix your number pad or sticky key problems. Be sure to follow all of the steps in order and pay attention to special notes throughout the guide.

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    • Unplug your device before beginning disassembly.

    • Remove the phone line from the back cover of the device.

    • Remove the power cord from the side of the device.

    • Remove the phone cable from the side of the device.

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    • Remove the five 4mm X 10mm screws from the back cover of the device using a Phillips #1 screwdriver.

    When reassembling, make sure to avoid using these screw positions (the lower left one and center one go down through the motherboard) when fastening the motherboard. If you do, you’ll find those two positions already filled and be unable to use all five screws on the exterior cover.

    Ken Boone -

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    • Using a metal spudger, pry the white, plastic cover from the gray, plastic bottom. Start from below the keypad and work your way evenly around the device.

    • There are brackets every few inches along the edge of the device. These may be difficult to pull apart.

    • The internals of the device will be accessible once the white, plastic cover and grey, plastic bottom are separated.

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    • Remove the five 5mm X 5mm screws located on the yellow side of the motherboard using a Phillips #1 screwdriver.

    • Set the motherboard out of the way.

    On my phone, there were only three screws holding the motherboard. The other two come in through the exterior cover, and their positions are marked on the motherboard.

    Ken Boone -

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    • Remove the two 5mm X 8mm large number pad screws using a Phillips #1 screwdriver.

    • Remove the 5mm X 6mm latch screw using the same screwdriver.

    • Remove the small, metal latch.

    • Remove the plastic plate previously secured by the screws and latch.

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    • Remove the remaining six 5mm X 8mm large number pad screws using a Phillips #1 screwdriver.

    • Remove the two 3mm X 6mm small number pad screws using the same screwdriver.

    • Grab the edge of the number pad board and peel it away from the screw posts.

    • Using a clean towel or cloth, move the number pad board away from the keys that lie below.

    • Set the number pad board out of the way for further disassembly.

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    • Peel away the white, rubber mat and set it aside for cleaning.

    • Remove the main key pad and any remaining keys. Remember where each key is located for reassembly.

    • Clean the rubber mat with a damp paper towel to remove any dust or foreign substances.

    • Replace any broken or cracked keys.

Conclusion

To reassemble your device, follow these instructions in reverse order.

Author

Nigel Mathias

Member since: 16/02/16

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