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Dell Latitude C400 Service Manual

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  Summary of Contents for Dell Latitude C400

  • Page 1 Thank you for purchasing this Factory Service Manual CD/DVD from servicemanuals4u.com. Please check out our eBay auctions for more great deals on Factory Service Manuals: servicemanuals4u...
  • Page 2 Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Computer Corporation; Intel is a registered trademark of Intel Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation.
  • Page 3 Dell Latitude C400 Service Manual October 2001 Rev. A00 file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/C400/C400_SERVICE_MANUAL/index.htm (2 of 2)6/21/2004 1:20:07 AM...
  • Page 4: Before You Begin

    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: To avoid damaging the computer, perform the following steps before you begin working inside the computer.
  • Page 5: Recommended Tools

    Before You Begin : Dell Latitude C400 Service Manual NOTICE: To avoid damaging the system board, you must remove the battery before you service the computer. 10. Remove the battery from the battery bay. 11. To dissipate any static electricity while you work, use a wrist grounding strap or periodically touch an unpainted metal surface.
  • Page 6: Screw Identification

    Before You Begin : Dell Latitude C400 Service Manual 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.
  • Page 7 Before You Begin : Dell Latitude C400 Service Manual NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length. Make sure that the screw is properly aligned with its corresponding hole, and avoid overtightening.
  • Page 8 Before You Begin : Dell Latitude C400 Service Manual Display Bezel: Palm Rest to Bottom Case: (6 each) Rubber screw covers: 6 each Critical Component Shield: Palm Rest to System Board: (6 each) (6 each) Cooling Fan: Audio Board: (3 each) (2 each) file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/C400/C400_SERVICE_MANUAL/begin.htm (5 of 6)6/21/2004 1:20:09 AM...
  • Page 9: System Board

    Before You Begin : Dell Latitude C400 Service Manual System Board: (1 each) Guide pins: 2 each 5-mm hex nuts: 4 each 7-mm hex nuts: 2 each Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/C400/C400_SERVICE_MANUAL/begin.htm (6 of 6)6/21/2004 1:20:09 AM...
  • Page 10: System Components

    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 manual assumes that a part can be replaced by performing the removal procedure in reverse order.
  • Page 11: Table Of Contents

    System Components : Dell Latitude C400 Service Manual 1 display memory module/modem cover 2 center cover battery 3 hard drive 10 audio card 4 cooling fan 11 audio card shield 5 reserve battery 12 critical component shield 6 system board...
  • Page 12: Removing The Keyboard

    Keyboard : Dell Latitude C400 Service Manual Back to Contents Page Keyboard Dell™ Latitude™ C400 Service Manual Removing the Keyboard Replacing the Keyboard Removing the Keyboard NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
  • Page 13 Keyboard : Dell Latitude C400 Service Manual 1 center cover a. Open the computer all the way (180 degrees) so that it lies flat against your work surface. b. Press and hold down the <F4> and <F5> keys to reveal the left release slot of the center cover.
  • Page 14: Keyboard Removal

    Keyboard : Dell Latitude C400 Service Manual 1 M2 x 4-mm screws (4) 2 keyboard locator tab 3 keyboard securing tabs (5) 4. Pry up the keyboard locator tab, lift the back edge of the keyboard slightly, and then pull the keyboard a small distance toward the back of the computer to release the five securing tabs located across the front edge of the keyboard.
  • Page 15: Replacing The Keyboard

    Keyboard : Dell Latitude C400 Service Manual 1 keyboard flex cable 6. Use the pull tab to pull the keyboard flex cable up from its connector on the system board. The keyboard is now disconnected from the bottom case. Replacing the Keyboard 1.
  • Page 16 Keyboard : Dell Latitude C400 Service Manual To aid with proper flex cable connection, a white locator line has been added near the end of the flex cable. Press the cable into the connector until the white line disappears and hold it steady while you snap the flex cable connector down.
  • Page 17 Keyboard : Dell Latitude C400 Service Manual 6. Replace the center cover. Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/C400/C400_SERVICE_MANUAL/keyboard.htm (6 of 6)6/21/2004 1:20:10 AM...
  • Page 18 Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual Back to Contents Page 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...
  • Page 19: Removing The Memory Modules

    Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual 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.
  • Page 20: Replacing The Memory Modules

    Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual Memory Module Removal 1 memory module socket 2 inner tabs (2) 3. 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.
  • Page 21 Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual 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.
  • Page 22 Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual 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.
  • Page 23 Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual press the card into its connector on the system board. 3. Install the M2 x 4-mm screw that secures the modem to the system board. 4. Replace the memory module/modem cover and tighten the two captive screws.
  • Page 24: Hard Drive

    Hard Drive : Dell Latitude C400 Service Manual Back to Contents Page Hard Drive Dell™ Latitude™ C400 Service Manual Removing the Hard Drive Replacing the Hard Drive Removing the Hard Drive 1. Save and close any open files, exit any open programs, and shut down the computer.
  • Page 25: Replacing The Hard Drive

    Hard Drive : Dell Latitude C400 Service Manual 1 bottom of computer 2 M2.5 x 12-mm screw (1) 3 hard drive door 4. Slide the hard drive straight 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.
  • Page 26 Hard Drive : Dell Latitude C400 Service Manual file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...20ok/Latitude/C400/C400_SERVICE_MANUAL/hdd.htm (3 of 3)6/21/2004 1:20:12 AM...
  • Page 27 Wireless Network Adapter : Dell Latitude C400 Service Manual Back to Contents Page Wireless Network Adapter Dell™ Latitude™ C400 Service Manual Removing the Wireless Network Adapter Replacing the Wireless Network Adapter Removing the Wireless Network Adapter NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
  • Page 28 Wireless Network Adapter : Dell Latitude C400 Service Manual 1 wireless cables (2) 2 wireless cable connectors (2) 3. Disconnect the two wireless cables from the wireless card. 4. Spread the two metal securing tabs apart, and pull the card from its socket.
  • Page 29: Removing The Display Assembly

    Display Assembly and Display Latch : Dell Latitude C400 Service Manual Back to Contents Page Display Assembly and Display Latch Dell™ Latitude™ C400 Service Manual Removing the Display Assembly Replacing the Display Latch Removing the Display Assembly NOTICE: You must remove the display assembly before you remove the palm rest.
  • Page 30: Display Assembly

    Display Assembly and Display Latch : Dell Latitude C400 Service Manual 1 M2.5 x 6-mm screws (2) 6. Turn the computer right-side up and open the display 180 degrees. Display Assembly file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/C400/C400_SERVICE_MANUAL/display.htm (2 of 5)6/21/2004 1:20:13 AM...
  • Page 31: Replacing The Display Latch

    Display Assembly and Display Latch : Dell Latitude C400 Service Manual 1 display-feed flex cable 2 M2.5 x 12-mm screws (2) 3 display-feed flex cable hold-down board 4 pull tab 7. Remove the two M2.5 x 12-mm screws from the display-feed flex cable hold-down board.
  • Page 32 Display Assembly and Display Latch : Dell Latitude C400 Service Manual 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.
  • Page 33 Display Assembly and Display Latch : Dell Latitude C400 Service Manual separates from the display assembly. 5. Install the new bezel. Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/C400/C400_SERVICE_MANUAL/display.htm (5 of 5)6/21/2004 1:20:13 AM...
  • Page 34: Palm Rest

    Palm Rest : Dell Latitude C400 Service Manual Back to Contents Page Palm Rest Dell™ Latitude™ C400 Service Manual Removing the Palm Rest Replacing the Palm Rest Removing the Palm Rest NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
  • Page 35 Palm Rest : Dell Latitude C400 Service Manual 1 M2.5 x 6-mm screws (4) 2 M2.6 x 1.8-mm screws (4) 3 M2 x 4-mm screws (2) 4 M2.5 x 6-mm screws (2) 5. Remove the four M2.6 x 1.8-mm screws located inside the battery bay.
  • Page 36: Palm Rest Removal

    Palm Rest : Dell Latitude C400 Service Manual 1 M2 x 4-mm screws (6) (one screw may be captive) 2 critical component shield 8. Remove the six M2 x 4-mm screws (one of which may be captive) that secure the critical component shield to the system board, and lift the shield away.
  • Page 37: Replacing The Palm Rest

    Palm Rest : Dell Latitude C400 Service Manual 1 M2.5 x 6-mm screws (6) 2 LED cable 3 palm-rest flex cable 9. Remove the six M2.5 x 6-mm screws that secure the palm rest to the system board. 10. Disconnect the LED and palm-rest flex cables.
  • Page 38 Palm Rest : Dell Latitude C400 Service Manual white line disappears and hold it steady while you snap the flex cable connector down. (The white line may reappear after the connector is closed; this should not indicate a problem with the connection.) Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/C400/C400_SERVICE_MANUAL/palmrest.htm (5 of 5)6/21/2004 1:20:14 AM...
  • Page 39: Cooling Fan

    Cooling Fan : Dell Latitude C400 Service Manual Back to Contents Page Cooling Fan Dell™ Latitude™ C400 Service Manual Removing the Cooling Fan Removing the Cooling Fan NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
  • Page 40 Cooling Fan : Dell Latitude C400 Service Manual 1 cooling fan 2 M2.5 x 6-mm screws (3) 3 fan cable 4 fan extender cable 5. Remove the fan cable from the fan extender cable that runs under the system board.
  • Page 41: Reserve Battery

    Reserve Battery : Dell Latitude C400 Service Manual Back to Contents Page Reserve Battery Dell™ Latitude™ C400 Service Manual Removing the Reserve Battery Replacing the Reserve Battery Removing the Reserve Battery NOTICE: The reserve battery provides power to the computer's RTC and NVRAM when the computer is turned off.
  • Page 42: Replacing The Reserve Battery

    Reserve Battery : Dell Latitude C400 Service Manual 1 reserve battery connector on system board 2 reserve battery cable 3 reserve battery 5. Disconnect the reserve battery cable from the system board connector. 6. Pry the reserve battery free from the system board. The reserve battery is attached to the system board with a piece of adhesive tape.
  • Page 43 Reserve Battery : Dell Latitude C400 Service Manual 3. Update the BIOS using a flash BIOS update program floppy disk or CD. For instructions on how to flash the BIOS, see "Flashing the BIOS." Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LAP.../Latitude/C400/C400_SERVICE_MANUAL/rsrvbatt.htm (3 of 3)6/21/2004 1:20:15 AM...
  • Page 44: Flashing The Bios

    Flashing the BIOS : Dell Latitude C400 Service Manual Back to Contents Page Flashing the BIOS Dell™ Latitude™ C400 Service Manual Perform the following steps to update the BIOS: 1. Make sure that the AC adapter is plugged in and that the main battery is installed properly.
  • Page 45: Audio Board

    Audio Board : Dell Latitude C400 Service Manual Back to Contents Page Audio Board Dell™ Latitude™ C400 Service Manual Removing the Audio Board Replacing the Audio Board Removing the Audio Board NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
  • Page 46: Replacing The Audio Board

    Audio Board : Dell Latitude C400 Service Manual 1 M2 x 4-mm screws (2) 2 audio board shield 3 audio board 5. Remove the two M2 x 4-mm screws from the audio board shield, and remove the shield. 6. Pull the audio board up out of its connector.
  • Page 47 Audio Board : Dell Latitude C400 Service Manual The audio board can be easily misaligned. When replacing it, first align the two screw holes in the board with the holes in the bosses. Then, as you press the audio board into the connector, sight sideways between the audio board and the system board to ensure that all pins on the audio board connector are headed correctly into the system board connector.
  • Page 48: Removing The System Board

    System Board : Dell Latitude C400 Service Manual Back to Contents Page System Board Dell™ Latitude™ C400 Service Manual Removing the System Board Replacing the System Board Removing the System Board The system board's BIOS chip contains the service tag sequence, which is also visible on a barcode label on the bottom of the computer.
  • Page 49 System Board : Dell Latitude C400 Service Manual 1 fan 2 reserve battery cable 3 connector for fan extender cable 4 hard-drive connector 5 M2 x 4-mm screw (1) 6 memory module socket 7 guide pins (2) 8 5-mm hex nuts (4) 9 7-mm hex nuts (2) 10.
  • Page 50: Replacing The System Board

    System Board : Dell Latitude C400 Service Manual 16. Remove the M2 x 4-mm screw that secures the right front corner of the system board. 17. Disengage the system board from the back panel. Replacing the System Board While replacing the system board, pull the fan extender cable aside to avoid trapping it beneath the system board.
  • Page 51: Battery Latch

    Battery Latch : Dell Latitude C400 Service Manual Back to Contents Page Battery Latch Dell™ Latitude™ C400 Service Manual Removing the Battery Latch Replacing the Battery Latch Removing the Battery Latch NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
  • Page 52 Battery Latch : Dell Latitude C400 Service Manual 1 tension spring 2 bottom case 3 battery latch 4 battery release-button tabs NOTICE: The tabs on the release button are plastic. When squeezing the tabs, be careful not to break them.
  • Page 53 Battery Latch : Dell Latitude C400 Service Manual 3. Holding the battery latch in place, press the release-button tabs through the underside of the bottom case and into the battery latch until the tabs snap into place. 4. Replace the tension spring.
  • Page 54: Serial Connector

    Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual Back to Contents Page Pin Assignments for I/O Connectors Dell™ Latitude™ C400 Service Manual Serial Connector USB Connector Docking Connector IDE Module Bay Connector Video Connector Serial Connector Pin Signal...
  • Page 55 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual Pin Signal Pin Signal Signal Signal HSYNC VGA_GRN STRB#/5V VSYNC CLK_SPCI VGA_RED DOCKED SAD0 USB_VD1+ VGA_BLU SAD1 USB_VD1- DOCK_SD/ SAD2 MODE SAD3 D_IRTX USB_VD2+ SAD4 D_IRRX USB_VD2- SAD5 DOCKOC1# SAD6...
  • Page 56: Video Connector

    Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual D_ACTLED SCLKRUN# D_PWRLED SLCT SAD17 DOCK_PWR_SRC SGNTA# SAD18 DOCK_PWR_SRC DAT_SMB SREQA# SAD19 DOCK_PWR_SRC DCLK_SMB SGNT0# SAD20 SMB_INIT# SREQ0# SAD21 +5VDOCK SPCIRST# +5VDOCK DAT_DOCKSM1 SH1SEL# SAD22 +5VDOCK CLK_DOCKSM1 SAD23 +5VDOCK DAT_DOCKKBD...
  • Page 57: Usb Connector

    Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual Pin Signal Pin Signal CRT_VCC GREEN DAT_DDC2 BLUE HSYNC VSYNC CLK_DDC2 USB Connector Pin Signal –DATA +DATA file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/C400/C400_SERVICE_MANUAL/pinouts.htm (4 of 6)6/21/2004 1:20:19 AM...
  • Page 58 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual GROUND IDE Module Bay Connector Pin Signal Pin Signal WGATE# BAY_MODPRES# MTR0# STEP# HDSEL# DRV0# RDATA# WRPRT# DIR# WRDATA# TRKO# INDEX# BAY_CD_FDD# DSKCHG# 1D6M_EN# SIDED1 SIDE_IOW# SIDED4 SIDED15 SIDED7 SIDED12...
  • Page 59 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual SIDED3 +5VMOD SIDEACT# SIDED6 SIDE_A1 +5VMOD SIDE_A0 SIDE_A2 +5VMOD SIDE_CSEL_SEC# SIDE_DACK# SIDED2 +5VMOD SIDED5 SIDE_IOR# +5VMOD SIDED8 SIDED14 MOD_CL_L +5VMOD CDGND SIDED11 BAY_MODPRES# +5VMOD MOD_CD_R Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/C400/C400_SERVICE_MANUAL/pinouts.htm (6 of 6)6/21/2004 1:20:19 AM...