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If you cannot shut down the computer using the computer operating system, press and hold the power button for 4 seconds. 4. If the computer is connected (docked) to a docking device, undock it. See the documentation that came with the docking device for instructions. 5. Disconnect the computer and any attached devices from electrical outlets. 6. To avoid possible damage to the system board, wait 10 to 20 seconds and then disconnect any attached devices. 7. Disconnect all other external cables from the computer. 8. Remove any installed PC Cards or plastic blanks from the PC Card slot. 9. 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. 10. Remove the primary battery from the battery bay and the secondary battery from the module bay, if a secondary battery is in use. 11. Remove any installed device in the module bay. 12. To dissipate any static electricity while you work, use a wrist grounding strap or periodically touch an unpainted metal surface. 13. 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: #1 magnetized Phillips screwdriver .-inch flat-blade screwdriver Small plastic scribe Microprocessor extractor Flash BIOS update program floppy disk or CD. 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) Back to Contents Page Back to Contents Page System Components Dell™ Latitude™ C540/C640 Service Manual NOTICE: 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: Unless otherwise noted, each procedure in this document assumes that a part can be replaced by performing the removal procedure in reverse order. 1 display assembly 10 bottom case 2 center control cover 11 memory module cover 3 microprocessor thermal cooling assembly 12 module bay device 4 hybrid cooling fan 13 main battery 5 microprocessor 14 hard drive 6 system board 15 left speaker 7 right speaker 16 palm rest 8 modem and network-adapter connector cover 17 keyboard 9 fan guard Back to Contents Page Back to Contents Page Hard Drive Dell™ Latitude™ C540/C640 Service Manual Removing the Hard Drive 1. Save and close any open files, exit any open programs, and then shut down the computer. NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries. NOTICE: The hard drive is very sensitive to shock. Handle the hard drive by its edges (do not squeeze the top of the hard drive case), and avoid dropping it. NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure. NOTICE: To prevent data loss, turn off your computer before removing the hard drive. Do not remove the hard drive while the computer is running, in standby mode, or in hibernate mode. CAUTION: If you remove the hard drive from the computer when the drive is hot, do not touch the metal housing of the hard drive. 2. Ground yourself by touching a metal connector on the back of the computer. 3. Turn the computer over. Remove the M3 x 5-mm screw from the hard drive door. 1 bottom of computer 2 M3 x 5-mm screw 3 hard drive door 4. Lift the hard drive door until you hear a click. 5. Slide the hard drive out of the computer. Replacing the Hard Drive NOTICE: Use firm and even pressure to slide the hard drive into place. If you force the hard drive into place using excessive force, you may damage the connector. 1. Lift the hard drive door until you hear a click. Push the hard drive until it is fully seated in the hard drive bay. 2. Press the hard drive door down. 3. Replace the M3 x 5-mm screw in the hard drive door. Back to Contents Page Back to Contents Page Memory Modules, Mini PCI Card, and Mo...
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