Latitude 5540 Owner's Manual

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Installing the 4G WWAN card (Optional)

Prerequisites

If you are replacing a component, remove the existing component before performing the installation process.

About this task

NOTE:The following steps are for computers with WWAN support.

The following image(s) indicate the location of the 4G WWAN card and provide a visual representation of the installation procedure.

Figure 1. Image: WWAN card
Image: Installing the WWAN card

Steps

  1. Align the notch on the 4G WWAN card with the tab on the 4G WWAN-card slot.
  2. Insert the 4G WWAN card at an angle into the 4G WWAN-card slot .
  3. Connect the antenna cables to the 4G WWAN card.

    The following table provides the antenna-cable color scheme for the 4G WWAN card that is supported by your computer.

    Table 1. Antenna-cable color schemeAntenna-cable color scheme
    Connectors on the WWAN card Antenna-cable color Silkscreen marking
    D/G Black with a thin white stripe 6 Aux △ (white triangle)
    M2 Blue 8 M2 △ (white triangle)
    M1 Orange 7 M1 △ (white triangle)
    M White with a thin gray stripe Main 5 ▲ (black triangle)
  4. Align the screw hole on the 4G WWAN-card bracket with the screw hole on the 4G WWAN card.
  5. Replace the screw (M2x3) that secures the 4G WWAN bracket to the 4G WWAN card.
  6. Align and place the 4G WWAN-card shield over the 4G WWAN card.

Next steps

  1. Install the base cover.
  2. Follow the procedure in After working inside your computer.

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