In order to remove the casing, first we will have to find and extract the screws. We will find two of them at the top, below the telephone stand. The other two are on the sides under the fastening rubbers. The screws are Phillips type (PH # 0).

Once the four screws have been removed, we can disengage the casing. Before removing it, we will disconnect the joystick from the motherboard.

Remove the two Phillips screws (PH # 0) that hold the dial. Then we disengage it and disconnect it.

The steps to follow are the same for both dials.