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Memory Modules, Mini PCI Card, and Modem

Dell™ Latitude™ C640 Service Manual

  Memory Modules

  Mini PCI Card

  Modem


Memory Modules

Removing the Memory Module Cover

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.
  1. Turn the computer over and loosen the two captive screws from the memory module cover.

  2. Remove the M2.5 x 12-mm screw labeled "circle K" from the memory module cover. (This screw is also one of the five keyboard screws.)

  3. Place your finger under the cover at the indentation and lift and slide the cover open.

1

M2.5 x 12-mm screw (1)

2

captive screws (2)

Removing the Memory Modules

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.
  1. Remove the memory module cover.

NOTICE: To prevent damage to the memory module connector, do not use tools to spread the inner metal tabs that secure the memory module.
  1. Use your fingertips to carefully spread apart the inner tabs on each end of the memory module socket. The module should pop up.

1

JDIM 2 memory socket

2

JDIM 1 memory socket

3

keying tab

4

keying notch

5

inner tabs (2 per socket)

  1. Lift the memory module out of its socket.

Replacing the Memory Modules

  1. If you only have one memory module, install it in the connector labeled "JDIM1" on the system board. Install a second memory module in the connector labeled "JDIM2."

NOTE: Memory modules are keyed, or designed to fit into their sockets, in only one direction.
NOTICE: The memory module must be inserted at a 45-degree angle to avoid damaging the connector.
  1. Align the notch in the memory-module edge connector with the tab in the socket.

  2. Slide the edge connector of the module firmly into the socket at a
    45-degree angle, and rotate the module down until it clicks into place. If you do not feel the click, remove the module and reinstall it.

  3. Replace the memory module cover and tighten the two captive screws.

Mini PCI Card

You must remove the Mini PCI card before the system board can be removed.

Removing the Mini PCI Card

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.
  1. Remove the memory module cover, which also covers the Mini-PCI card.

  2. Disconnect the Mini PCI card from the antenna cables.

  3. To release a Mini PCI card from its socket, spread apart the metal securing tabs until the card pops up slightly.

  4. Lift the Mini PCI card out of its connector.

1

antenna connectors on card (2)

2

antenna cables (2)

Replacing the Mini PCI Card

  1. Align the Mini PCI card with the socket at a 45-degree angle, and press the Mini PCI card into the socket.

NOTICE: The connectors are keyed for correct insertion; do not force the connections.
  1. Pivot the Mini PCI card down until it snaps into the inner tabs of the socket.

  2. Attach the antenna cables to the Mini PCI card.

  3. Replace the memory module cover and tighten the two captive screws.

Modem

Removing the Modem

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.
  1. Turn the computer over, and remove the memory module cover, which also covers the modem.

  2. Remove the two M2 x 3-mm screws that secure the modem to the system board.

NOTICE: Do not pull on the modem cable. Pull from the modem connector to disconnect the cable.
  1. Pull straight up on the attached pull-tab to lift the modem out of its connector on the system board and disconnect the modem cable.

1

M2 x 3-mm screws (2)

2

modem connector

3

modem cable

4

pull-tab

Replacing the Modem

  1. Connect the modem cable to the modem.

NOTICE: The connectors are keyed for correct insertion; do not force the connections.
  1. Align the modem with the screw holes on the system board and press down on the pull-tab to seat the modem in the connector.

NOTICE: Pressing down on the modem somewhere other than on the pull-tab can break the modem.
  1. Install the two M2 x 3-mm screws that secure the modem to the system board.

  2. Replace the memory module cover and tighten the two captive screws.

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