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Dell Latitude C400 Service Manual

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Dell Latitude C400 Service Manual
Dell™ Latitude™ C400 Service Manual
Before You Begin
System Components
Keyboard
Memory Module and Modem Daughter Card
Hard Drive
Wireless Network Adapter
Display Assembly and Display Latch
Palm Rest
Cooling Fan
Reserve Battery
Flashing the BIOS
Audio Board
System Board
Battery Latch
Pin Assignments for I/O Connectors
Notes, Notices, and Cautions
NOTE:
A NOTE indicates important information that helps you make better use
of your computer.
NOTICE:
A NOTICE indicates either potential damage to hardware or loss of
data and tells you how to avoid the problem.
CAUTION:
personal injury, or death.
file:///F|/Service%20Manuals/Dell/Latitude/c400/index.htm (1 of 2) [2/28/2004 7:50:46 AM]
A CAUTION indicates a potential for property damage,

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  Summary of Contents for Dell Latitude C400

  • Page 1 A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death. file:///F|/Service%20Manuals/Dell/Latitude/c400/index.htm (1 of 2) [2/28/2004 7:50:46 AM]...
  • Page 2 Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.
  • Page 3: Before You Begin

    Preparing to Work Inside the Computer 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 4: Recommended Tools

    Before You Begin : Dell Latitude C400 Service Manual 7. Disconnect all other external cables from the computer, including the IDE modular bay cable (if connected). 8. Remove any installed PC Cards or plastic blanks from the PC Card slot.
  • Page 5: 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 6: Modem Daughter Card

    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 7: Display Bezel

    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:///F|/Service%20Manuals/Dell/Latitude/c400/begin.htm (5 of 6) [2/28/2004 7:50:57 AM]...
  • Page 8: 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:///F|/Service%20Manuals/Dell/Latitude/c400/begin.htm (6 of 6) [2/28/2004 7:50:57 AM]...
  • Page 9: System Components

    Dell™ Latitude™ C400 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 manual assumes that a part can be replaced by performing the removal procedure in reverse order.
  • Page 10: 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 13 palm rest file:///F|/Service%20Manuals/Dell/Latitude/c400/system.htm (2 of 3) [2/28/2004 7:50:58 AM]...
  • Page 11 System Components : Dell Latitude C400 Service Manual 7 bottom case 14 keyboard Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c400/system.htm (3 of 3) [2/28/2004 7:50:58 AM]...
  • 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: Center Cover

    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 : Dell Latitude C400 Service Manual 3. Remove the four M2 x 4-mm screws that secure the back edge of the keyboard. Keyboard Screws 1 M2 x 4-mm screws (4) 2 keyboard locator tab 3 keyboard securing tabs (5) 4.
  • Page 15: Keyboard Removal

    Keyboard : Dell Latitude C400 Service Manual NOTICE: Do not pull on the keyboard flex cable. Keyboard Removal 1 keyboard flex cable 6. Use the pull tab to pull the keyboard flex cable up from its connector on the system board.
  • Page 16 Keyboard : Dell Latitude C400 Service Manual pointing toward the back of the computer. NOTICE: To avoid damage to the connector pins, press the keyboard flex cable connector evenly into the interface connector on the system board, and do not reverse the keyboard connector.
  • Page 17 Keyboard : Dell Latitude C400 Service Manual 1 keyboard securing tabs (5) 4. Carefully rotate the keyboard back and fit it into the bottom case. Ensure that all five securing tabs are engaged in their respective slots before trying to completely seat the keyboard. Fitting the tabs to the slots may be easiest when viewed from above and slightly behind the front edge of the keyboard.
  • 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 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.
  • Page 20 Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual NOTICE: To prevent damage to the memory module connector, do not use tools to spread the inner metal tabs that secure the memory module. 2. Use your fingertips to carefully spread apart the inner tabs on each end of the memory module socket.
  • Page 21: Replacing The Memory Modules

    Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual 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.
  • Page 22: Modem Connector

    Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual NOTICE: Do not pull on the modem cable. Pull from the modem connector to disconnect the cable. 3. Use the pull tab to pull the modem daughter card straight up out of its connector.
  • Page 23 Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual 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.
  • 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 Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c400/hdd.htm (3 of 3) [2/28/2004 7:51:00 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 Wireless Network Adapter : Dell Latitude C400 Service Manual file:///F|/Service%20Manuals/Dell/Latitude/c400/wireless.htm (3 of 3) [2/28/2004 7:51:01 AM]...
  • Page 30: 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 31: 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:///F|/Service%20Manuals/Dell/Latitude/c400/display.htm (2 of 5) [2/28/2004 7:51:02 AM]...
  • Page 32 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 33: Replacing The Display Latch

    Display Assembly and Display Latch : Dell Latitude C400 Service Manual Replacing the Display Latch 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 34: Display Latch

    Display Assembly and Display Latch : Dell Latitude C400 Service Manual 2 display latch 3 M2 x 4-mm screw (6) 4 display assembly 4. Use a small flat-blade screwdriver to carefully pry around the perimeter of the bezel until the bezel separates from the display assembly.
  • Page 35: 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 36 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 37: 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 38 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 39: Replacing The Palm Rest

    Palm Rest : Dell Latitude C400 Service Manual Replacing the Palm Rest To aid with proper flex cable connection, a white locator line has been added near the ends of the flex cables. When replacing the LED and palm-rest flex cables, press the cable into the connector until the white line disappears and hold it steady while you snap the flex cable connector down.
  • Page 40: Removing The 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 41 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 42 Cooling Fan : Dell Latitude C400 Service Manual file:///F|/Service%20Manuals/Dell/Latitude/c400/fan.htm (3 of 3) [2/28/2004 7:51:03 AM]...
  • Page 43: 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 44: 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 45 Reserve Battery : Dell Latitude C400 Service Manual 1. Connect the reserve battery cable to the system board connector. 2. Press the reserve battery into place on the system board. 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...
  • Page 46: 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 47 Flashing the BIOS : Dell Latitude C400 Service Manual Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c400/bios.htm (2 of 2) [2/28/2004 7:51:04 AM]...
  • Page 48: Removing The 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 49 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 50: Replacing The Audio Board

    Audio Board : Dell Latitude C400 Service Manual Replacing the Audio Board 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...
  • Page 51: 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 52: System Board Removal

    System Board : Dell Latitude C400 Service Manual System Board Removal 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)
  • Page 53: Replacing The System Board

    System Board : Dell Latitude C400 Service Manual 12. Remove the two guide pins from the IDE connector. 13. Disconnect the cooling fan from the fan extender cable. 14. Disconnect the fan extender cable from the connector beside the internal memory socket.
  • Page 54: 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 55 Battery Latch : Dell Latitude C400 Service Manual Battery Latch Removal 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 56 Battery Latch : Dell Latitude C400 Service Manual Replacing the Battery Latch 1. With the inside of the bottom case facing up, place the battery latch in position. 2. Turn the bottom case over and align the slot in the battery latch with the release- button slot in the bottom case.
  • Page 57: 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 58: Docking Connector

    Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual Docking Connector Pin Signal Pin Signal Pin Signal Pin Signal HSYNC 101 VGA_GRN 151 GND STRB#/5V VSYNC 102 GND 152 CLK_SPCI 103 VGA_RED 153 GND DOCKED 104 GND 154 SAD0...
  • Page 59 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual DFDD/LPT# 122 SDEVSEL# 172 SAD15 INIT# 123 STRDY# 173 SAD16 SLCT_IN# 124 SIRDY# 174 SC/BE1# BUSY 125 SFRAME# 175 CD/BE2# D_ACTLED 126 SCLKRUN# 176 GND D_PWRLED SLCT 127 GND 177 SAD17...
  • Page 60: Video Connector

    Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual LOW_PWR Video Connector Pin Signal Pin Signal CRT_VCC GREEN DAT_DDC2 BLUE HSYNC VSYNC CLK_DDC2 USB Connector file:///F|/Service%20Manuals/Dell/Latitude/c400/pinouts.htm (4 of 7) [2/28/2004 7:51:08 AM]...
  • Page 61 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual Pin Signal –DATA +DATA GROUND IDE Module Bay Connector Pin Signal Pin Signal WGATE# BAY_MODPRES# MTR0# HDSEL# STEP# DRV0# RDATA# WRPRT# DIR# WRDATA# file:///F|/Service%20Manuals/Dell/Latitude/c400/pinouts.htm (5 of 7) [2/28/2004 7:51:08 AM]...
  • Page 62 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual INDEX# TRKO# DSKCHG# BAY_CD_FDD# 1D6M_EN# SIDE_IOW# SIDED1 SIDED15 SIDED4 SIDED12 SIDED7 SIDED9 SIDE_CS3# SIDEIORDY SIDE_CS1# +5VMOD SIDE_DREQ IRQ15 +5VMOD SIDED13 SIDED0 SIDED10 +5VMOD IDE_RST_MOD_5V# SIDED3 +5VMOD SIDEACT# SIDED6 SIDE_A1 +5VMOD...
  • Page 63 Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c400/pinouts.htm (7 of 7) [2/28/2004 7:51:08 AM]...