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# Memory Module and Modem Daughter Card

Dell™ Latitude™ C400 Service Manual

Removing the Memory Module/Modem Cover

Removing the Memory Modules

Replacing the Memory Modules

Removing the Modem Daughter Card

Replacing the Modem Daughter Card

## Removing the Memory Module/Modem Cover

| NOTE: This procedure covers removing and replacing the memory module located under the memory module/modem cover on the bottom of the computer. A second memory module resides on the upper surface of the system board under the critical component shield. To replace the memory module under the critical component shield, perform the procedure for removing the palm rest up to and including removal of the critical component shield. Then replace the memory module.

| 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 use a #1 Phillips screwdriver to release the two captive screws from the memory module/modem cover.
2. Place your finger under the cover at the indentation, rotate the cover open, and remove it.

Memory Module/Modem Cover

## Removing the Memory Modules

| NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove the battery.

| 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/modem 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.

Memory Module Removal

1 | memory module socket
2 | inner tabs (2)

1. Lift the memory module out of its socket.

## Replacing the Memory Modules

| 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 with the slot in the center of 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 you hear a click. If you do not hear the click, remove the module and reinstall it.
3. Replace the cover and tighten the two captive screws.

## Removing the Modem Daughter Card

| NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove the battery.

| 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/modem cover.
2. Remove the M2 x 4-mm screw that secures the modem daughter card to the system board.

| NOTICE: Do not pull on the modem cable. Pull from the modem connector to disconnect the cable.

1. Use the pull tab to pull the modem daughter card straight up out of its connector.
2. Disconnect the modem cable from the modem daughter card.

Modem Daughter Card Removal

1 | M2 x 4-mm screw (1)
2 | pull tab
3 | boss
4 | modem connector
5 | modem cable

## Replacing the Modem Daughter Card

1. Connect the modem cable to the modem daughter card.

| NOTICE: The connectors are keyed for correct insertion; do not force the connections.

1. Using the screw hole and the boss at the opposite corner of the daughter card to align the card, press the card into its connector on the system board.
2. Install the M2 x 4-mm screw that secures the modem to the system board.
3. Replace the memory module/modem cover and tighten the two captive screws.

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