Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement

Introdução

With our stock of Cisco IP Phones, quite often we have complains, that buttons are sticking or not pressing, handset hook does not work, etc. In most cases we just replace a phone. However with 5-10 minutes of your time, these phones may be cleaned up, and get back to the stock (or use for your own pleasure).

O que você precisa

Passo 1 Disconnect handset and stand

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Disconnect handset and stand: passo 1, imagem 1 %32

Flip the phone over. Disconnect all wires. Detach a stand. To do it, you need to squeeze two latches that hold the stand. You may need to use a screwdriver or something else to push them

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Passo 2 Remove screws that hold back.

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Remove screws that hold back.: passo 2, imagem 1 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Remove screws that hold back.: passo 2, imagem 2 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Remove screws that hold back.: passo 2, imagem 3 %32

Remove two visible screws on the upper part of the phone.
Two screws on the bottom are covered with a rubber feet.
Fifth screw is hidden under the handset hook. Use star screwdriver to remove it.

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Passo 3 Remove back cover

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Remove back cover: passo 3, imagem 1 %32

Removing back part may be tricky... Bottom part may come off easily *after screws removed, however top part has hooks.
You may need to try to "shift" back part down, or try to pray it so front part goes up.

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Passo 4 Disconnecting a screen

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Disconnecting a screen: passo 4, imagem 1 %32

To remove flat cable, carefully push a gray lock, and then remove the ribbon cable.

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Passo 5 Remove main board

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Remove main board: passo 5, imagem 1 %32

Disconnect all visible wires (microphone, speakerphone, and handset hook controls)
Remove all visible screws. Two screws on the top are smaller, so, you may use smaller fillips bit.

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Passo 6 Clean rubber keypad elements

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Clean rubber keypad elements: passo 6, imagem 1 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Clean rubber keypad elements: passo 6, imagem 2 %32

Now you may clean a rubber button pad. If user spilled something on the phone, you may need to clean not just rubber part, but plastic buttons as well.

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Passo 7 Clean handset hook area

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Clean handset hook area: passo 7, imagem 1 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Clean handset hook area: passo 7, imagem 2 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Clean handset hook area: passo 7, imagem 3 %32

Remove one screw that holds a handset control board.
Unhook a spring that holds hook switch.
Clean the area.

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Passo 8 Open and clean speaker

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Open and clean speaker: passo 8, imagem 1 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Open and clean speaker: passo 8, imagem 2 %32

Cisco 7945G IP Phone | Disassembly | Keys, handset hook, etc. Replacement, Open and clean speaker: passo 8, imagem 3 %32

Speaker box is covered with some kind of rubbery film. You may need to save it, as it improves sound.
There are four screws, one exposed, and three covered with rubber film.
After all four screws removed, pry and pull the speaker box cover. It has rubber gasket that may hold it in place.