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Before You Begin

Dell™ Latitude™ C640 Service Manual

  Preparing to Work Inside the Computer

  Recommended Tools

  Screw Identification


Preparing to Work Inside the Computer

CAUTION: Before working inside your computer, read the safety instructions in your System Information Guide.
CAUTION: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not covered by your warranty.
NOTICE: To avoid damaging the computer, perform the following steps before you begin working inside the computer.
  1. Ensure that the work surface is clean to prevent scratching the computer cover.

  2. Save any work in progress and exit all open programs.

  3. Turn off the computer and all attached devices.

NOTE: Before turning off the computer, ensure that the computer is not in a power management mode. If you cannot shut down the computer using the computer operating system, press and hold the power button for 4 seconds.
  1. If the computer is connected (docked) to a docking device, undock it. See the documentation that came with the docking device for instructions.

  2. Disconnect the computer and any attached devices from electrical outlets.

  3. To avoid possible damage to the system board, wait 10 to 20 seconds and then disconnect any attached devices.

  4. Disconnect all other external cables from the computer.

  5. Remove any installed PC Cards or plastic blanks from the PC Card slot.

  6. Close the display and turn the computer upside down on a flat work surface.

NOTICE: To avoid damaging the system board, you must remove the main battery and secondary battery (if present) before you service the computer.
  1. Remove the primary battery from the battery bay and the secondary battery from the module bay, if a secondary battery is in use.

  2. Remove any installed device in the module bay.

  3. To dissipate any static electricity while you work, use a wrist grounding strap or periodically touch an unpainted metal surface.

  4. Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by it edges or by its metal mounting bracket. Hold a component such as a microprocessor by its edges, not by its pins.

Recommended Tools

The procedures in this manual require the following tools:

Computer Orientation

1

back

2

right

3

front

4

left                                  

Screw Identification

When you are removing and replacing components, photocopy the placemat as a tool to lay out and keep track of the screws. The placemat provides the number of screws and their sizes.

NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length. Ensure that the screw is properly aligned with its corresponding hole, and avoid overtightening.

Hard Drive Door:

(1 each)

Memory Module Cover:

(2 captive screws)

(1 each)

NOTE: The single screw is one of the five keyboard screws.

Modem to
System Board:

(2 each)

Keyboard to
Bottom Case:

(5 each)

Hinges to Bottom Case:

(5 each)

Display-Feed Flex Cable:

(4 each)

Display Bezel:

(6 each)

Rubber Screw Covers (6 each)

Display Panel to Top Cover:

(5 each)

Display Latch:

(2 each) (2 each)

Palm Rest to
Bottom Case:

(3 each) (5 each)

Hybrid Cooling Fan:

(2 each) (1 each)

System Board to Bottom Case:

(10 each)

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