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.
Back to Contents Page Before You Begin Dell™ Latitude™ C400 Service Manual Preparing to Work Inside the Computer Recommended Tools Screw Identification 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. 1.
5-mm nut driver 7-mm nut driver Needle-nose pliers 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. Screw Identification NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length.
Hard Drive Door: Modem Daughter Card: (1 each) (1 each) Keyboard: Display Assembly: (4 each) 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)
System Board: (1 each) Guide pins: 2 each 5-mm hex nuts: 4 each 7-mm hex nuts: 2 each Back to Contents Page
Back to Contents Page 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.
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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. 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 hard drive.
row or two of keycaps, and press on the straightedge instead of on the keycaps themselves. c. Insert a flat-blade screwdriver into the slot. While holding the screwdriver, make your hand into a fist, brace your knuckles against the keyboard, and pry up the center cover. d. Repeat steps b and c for the right release slot, located behind the and keys. e. Lift the center cover up and away from the bottom case. 3. Remove the four M2 x 4-mm screws that secure the back edge of the keyboard.
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. Replace the hard drive. 2. Place the keyboard face-down on the palm rest, with the keyboard flex cable pointing toward the back of the computer.
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. Press down on the left and right keys to help control tab/slot alignment.
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 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.
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: 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.
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. 2. 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. 3. Install the M2 x 4-mm screw that secures the modem to the system board. 4.
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. NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove the battery. 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.
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. 1. Push the hard drive into the drive bay until it is fully seated in the bay. 2. Replace the M2.5 x 12-mm screw in the hard drive door.
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. NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer.
down into place.
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. 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.
Display Assembly 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. 8. Use the pull tab to disconnect the display-feed flex cable from its connector on the system board. 9. Move the display assembly to an upright position and pull it up out of the computer.
To replace the display latch, you must replace the whole bezel. 1. Remove the battery. 2. Remove the hard drive. 3. Open the display 180 degrees, and remove the six rubber screw covers and the six M2 x 4-mm screws that secure the bezel. Bezel Removal 1 bezel 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. 5. Install the new bezel.
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. 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.
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. 6. Remove the two M2.5 x 6-mm screws located near the service tag at the back edge of the computer. 7. Turn the computer over and remove the two M2 x 4-mm screws located above the serial, docking, and video connectors on the back panel.
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. 11. If a Mini PCI wireless card is installed, disconnect the two wireless cables from the card. 12. Lift the palm rest away. 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.
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. 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 hard drive. 2.
5. Remove the fan cable from the fan extender cable that runs under the system board. 6. Remove the three M2.5 x 6-mm screws that secure the cooling fan. 7. Lift out the cooling fan.
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. Removing the battery causes the computer to lose the date and time information as well as all user-specified parameters in the BIOS. If possible, make a copy of this information before you remove the reserve battery.
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. 7. Remove any remnants of the adhesive tape from the system board. Replacing the Reserve Battery 1. Connect the reserve battery cable to the system board connector. 2.
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. 2. Turn on the computer. The following error message appears: System hardware failures: #0010 Strike the F1 key to shutdown 3. Instead of pressing , insert the Flash BIOS update floppy disk or CD into the appropriate drive and press , and then press .
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. 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.
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. 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.
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. The replacement kit for the system board may include a CD that provides a utility for transferring the service tag sequence to the replacement system board.
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. Remove the four 5-mm hex nuts near each end of the serial and video connectors. 11. Use a flat-blade screwdriver to remove the two 7-mm hex nuts near each end of the docking connector. 12. Remove the two guide pins from the IDE connector. 13. Disconnect the cooling fan from the fan extender cable. 14.
After you have replaced the system board, insert the floppy disk or CD that accompanied the replacement system board into the appropriate drive, and turn on the computer. Follow the instructions on the screen. NOTE: After replacing the system board, be sure to enter the computer's service tag sequence into the BIOS of the replacement system board.
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. 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.
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. 11. On the inside of the bottom case, use needle-nose pliers to gently squeeze the two release-button tabs together and push the tabs down through the hole, catching the release button on the outside of the bottom case. 12.
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 1 DCD 2 RXDA 3 TXDA 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 RI Docking Connector Pin Signal Pin Signal Pin Signal Pin Signal 1 STRB#/5V 51 HSYNC 101 VGA_GRN 151 GND 2 PD0 52 VSYNC 102 GND 152 CLK_SPCI 3 PD1 53 GND 103 VGA_RED 153 GND 4 PD2 54 DOCKED 104 GND
8 PD6 58 USB_VD2+ 108 D_IRRX 158 SAD4 9 PD7 59 USB_VD2- 109 GND 159 SAD5 10 GND 60 DOCKOC1# 110 SPIRQB# 160 SAD6 11 DOCK_SPKR 61 RUN_ON# 111 SPIRQC# 161 GND 12 DOCK_MIC 62 GND 112 DAT_DDC2 162 SAD7 13 DOCK_LINE 63 NC 113 CLK_DDC2 163 SAD8 14 DOCK_CDROM 64 DOCK_SCLK 114 SPAR 164 SC/BE0# 15 GND 65 DOCK_LRCK 115 SPME# 165 SAD9 16 NC 66 DOCK_MCLK 116 GND 166 SAD10 17 POWER_SW# 67 GND 117 SSERR# 167 SAD11 18 QPCIEN# 68 +12V 118 SPERR# 168 SAD12 19
48 DOCK_+DC_IN 98 +5VSUS 148 NC 198 NC 49 GND 99 NC 149 +5VALW 199 NC 50 LOW_PWR 100 NC 150 NC 200 GND Video Connector Pin Signal Pin Signal 1 RED 9 CRT_VCC 2 GREEN 10 GND 3 BLUE 11 NC 4 NC 12 DAT_DDC2 5 GND 13 HSYNC 6 GND 14 VSYNC 7 GND 15 CLK_DDC2 8 GND USB Connector Pin Signal 1 VCC 2 –DATA 3 +DATA 4 GROUND IDE Module Bay Connector
Pin Signal Pin Signal 1 BAY_MODPRES# 35 WGATE# 2 HDSEL# 36 GND 3 RDATA# 37 MTR0# 4 WRPRT# 38 STEP# 5 WRDATA# 39 DRV0# 6 INDEX# 40 GND 7 DSKCHG# 41 DIR# 8 1D6M_EN# 42 TRKO# 9 SIDE_IOW# 43 BAY_CD_FDD# 10 SIDED15 44 GND 11 SIDED12 45 SIDED1 12 SIDED9 46 SIDED4 13 SIDE_CS3# 47 SIDED7 14 SIDE_CS1# 48 GND 15 +5VMOD 49 SIDEIORDY 16 IRQ15 50 GND 17 +5VMOD 51 SIDE_DREQ 18 SIDED0 52 GND 19 +5VMOD 53 SIDED13 20 SIDED3 54 SIDED10 21 +5VM
