Dell C400 User's Manual
Contents
1. Replacing the Memory Modules K 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 l Align the notch in the memory module with the slot in the center of the socket 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 Removing the Modem Daughter Card 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 Turn the computer over and remove the memory module modem cover Remove the M2 x 4 mm screw that secures the modem daughter card to the system board 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 4 Disconnect the modem cable from the modem daughter card Modem Daughter Card Removal S M2 x 4 mm M2 x 4 mm screw 1 2 pull tab 4 mo2. 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 D IRRX GND SPIRQB SPIRQC DAT_DDC2 CLK DDC2 SPAR SPME GND SSERR SPERR SLOCK SSTOP GND SDEVSEL STRDY SIRDY SFRAME SCLKRUN GND SGNTA SREQA SGNTO SREQO SPCIRST SH1SEL GND SWRPRT SDSKCHG DRQ SDIR STRKO SSTEP SDRV1 GND SMTR1 SWRDATA SWGATE SRDATA SINDEX GND 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 SAD4 SAD5 SAD6 GND SAD7 SAD8 SC BEO SAD9 SAD10 SAD11 SAD12 GND SAD13 SAD14 SAD15 SAD16 SC BE1 CD BE2 GND SAD17 SAD18 SAD19 SAD20 SAD21 GND SAD22 SAD23 SAD24 SC BE3 SAD25 GND SAD26 SAD27 SAD28 SAD29 SAD30 SAD31 GND NC NC 48 DOCK DC IN 84321 109876 15 14 13 12 11 s ere s no s joo USB Connector 1234 Pin signa IDE Module Bay Connector Signar BAY MODPRES 33 C 55 woare s eu a7 mo ve sre 5 one a foo is sw ar ser mo st one ICONE sss a som 5s oe 51 woo sv ss oo 7 some ws soa a eo esos sm N N Pin 2 CR a LN 10 Eg 12 13 EN 15 16 Ex ER 19 20 ES 22 23 24 25 26 27 ER 29 EN ES a2 EN EN Pin EM 36 a 38 ERN z a
3. 73 74 75 7 17 78 79 Oo SLCT GND DAT SMB DCLK SMB SMB INIT GND DAT DOCKSMI1 CLK_DOCKSM1 DAT_DOCKKBD CLK_DOCKKBD GND 81 82 83 85 87 Co Co CTSO RTSO DSRO GND DTRO TXDO RXDO DCDO 91 92 93 95 59 use voz efen 159 60 pockocie osios 160 Mr j pupecee c 63 wc usjakoe e 64 pocksck ue sram 164 65 pock umck jusjsewew j 165 66 pock meik refero 166 67 jeno pesses aer je ruv eee 1e 69 faroe juiejstocke seo 70 errore azo ssrore nro je J papse m 72 jeo Jaz soevsebe ur p me qazs sreve ars los sjer rs pus pasjsmawe 7 pe fre auze scemuwe are mr qae pe eno esene ure 79 par swe aze smeone ure so pcik sme jiso sewros 160 81 swe ivre 31 SmeQoe j 1er 82 eno earst 82 83 oar oocksmi 133 sHiseL nes 84 cucpockswr iow ae 85 pAr pockke iss swmeere 165 86 ax pockkep 136 SDSKCHG DRQ 186 87 jeno asr soee aer se Rio sejsreoe nee s9 crso jnse ssreme nes 20 nrso aeo somvie j 1o 81 josro J jam s 82 ono peme ae 23 otro aes swmowrwe 193 94 rxpo ne swearee 194 95 RxDo aes smparee 195 26 pcoo mesnom j 19e 87 vc eje ge 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
4. Then replace the memory module o NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries o NOTI CE 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 Turn the computer over and use a 1 Phillips screwdriver to release the two captive screws from the memory module modem cover 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 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 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 The module should pop up Memory Module Removal 1 memory module socket 2 inner tabs 2 3 Lift the memory module out of its socket
5. 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 l 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 BIOS Back to Contents Page Back to Contents Page Flashing the BI OS Dell Latitude C400 Service Manual Perform the following steps to update the BIOS 1 2 Make sure that the AC adapter is plugged in and that the main battery is installed properly Turn on the computer The following error message appears System hardware failures 0010 Strike the F1 key to shutdown Instead of pressing lt F1 gt insert the Flash BIOS update floppy disk or CD into the appropriate drive and press lt F6 gt and then press lt F4 gt The computer displays the following message on the screen Failure override Processor update failure Reload current BIOS Strike the F1 key to continue F2 to run the setup utility Press F1 The computer continues to boot and updates the new BIOS Press F2 to ente
6. 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 NOTICE The key caps on the keyboard are fragile easily dislodged and time consuming to replace Be careful when removing and handling the keyboard 2 Turn the computer right side up and remove the center cover Center Cover Removal 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 lt F4 gt and lt F5 gt keys to reveal the left release slot of the center cover K NOTE To protect the keycaps it may be helpful to place a straightedge such as a short ruler across the first 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 F9 and lt F10 gt 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 Keyboard Screws H M2 x 4 mm M2 x 4 mm screws 4 keyboard locator tab keyboard securing tabs 5 4 Pry up the keyboard locator tab lift the back edge of the k
7. 10 11 12 15 14 15 16 17 Remove the four 5 mm hex nuts near each end of the serial and video connectors Use a flat blade screwdriver to remove the two 7 mm hex nuts near each end of the docking connector Remove the two guide pins from the IDE connector Disconnect the cooling fan from the fan extender cable Disconnect the fan extender cable from the connector beside the internal memory socket Disconnect the reserve battery cable from the system board Remove the M2 x 4 mm screw that secures the right front corner of the system board 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 After replacing the system board route the cable between the hard drive connector and the internal memory socket 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 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
8. 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 Ed NOTE NOTE indicates important information that helps you make better use of your computer NOTICE NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem PN CAUTI ON A CAUTION indicates a potential for property damage personal injury or death I nformation in this document is subject to change without notice 2001 Dell Computer Corporation All rights reserved 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 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 October 2001 Rev A00 Back to Contents Pag
9. La a6 CA La o 50 51 52 ER ER 55 56 57 58 so C3 s ss s 67 68 Back to Contents Page
10. ach side of battery bay 2 Jun by service tag M2 x 4 mm Rubber screw covers 6 each a 3 LE P H H M2 5x 6mm MZB6x1 8mm M2x4mm Critical Component Shield Palm Rest to System Board 6 each 6 each i I M2 5 x 56mm Cooling Fan Audio Board 3 each 2 each LLLEJ Ex I H M2 5 x 6 mm M2 x d mm 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 NOTI CE 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 System Components 1 display 8 memory module modem cover 2 center cover s mmrame o mdecd a coo ng an 11 audio ara she 5 reserve battery 12 7 bottom case a exwwi Back to Contents Page 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
11. 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 PC Card or plastic blank if present from the PC Card slot 2 Remove the hard drive 3 Remove the keyboard 4 Remove the display assembly 5 Remove the palm rest 6 Remove the wireless network adapter if present 7 Remove the modem daughter card if present 8 Remove all installed memory modules 9 Remove the audio board 10 Remove the system board Battery Latch Removal 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 To remove the battery latch unhook the small tension spring located on the metal post next to the hard drive Replacing the Battery Latch l 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 3 Hold
12. dem connector 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 Replace the memory module modem cover and tighten the two captive screws Back to Contents Page Back to Contents Page Hard Drive Dell Latitude C400 Service Manual Removing the Hard Drive Q Replacing the Hard Drive Removing the Hard Drive l Save and close any open files exit any open programs and shut down the computer NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove the battery NOTI CE 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 NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure NOTI CE To prevent data loss turn off your computer before removing the hard drive Do not remove the hard drive while the computer is on in standby mode or in hibernate mode gt 60000 CAUTI ON If you remove the hard drive from the computer when the drive is hot do not touch the metal housing o
13. e Before You Begin Dell Latitude C400 Service Manual Preparing to Work Inside the Computer Recommended Tools i Screw Identification Preparing to Work Inside the Computer 10 11 12 NOTI CE 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 NOTI CE To avoid damaging the computer perform the following steps before you begin working inside the computer Make sure that the work surface is clean to prevent scratching the computer cover Save any work in progress and close all open application programs Turn off the computer and all attached devices NOTE Make sure the computer is turned off and not in suspend to disk or hibernate mode If you cannot shut down the computer using the computer s operating system press and hold the power button for 4 seconds Make sure the computer is undocked Disconnect the computer from the electrical outlet To avoid possible damage to the system board wait 10 to 20 seconds and then disconnect any attached devices Disconnect all other external cables from the computer including the IDE modular bay cable if connected Remove any installed PC Cards or plastic blanks from the PC Card slot Close the display and turn the computer upside down on a flat work surface NOTI CE To avoid damaging the system board you must remove the bat
14. e computer and any attached devices from electrical outlets and remove any installed batteries NOTI CE To avoid ESD ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure Remove the hard drive Remove the keyboard NOTI CE You must remove the display assembly before you remove the palm rest the display hinges pass through the back of the palm rest Remove the display assembly Turn the computer over and remove the four M2 5 x 6 mm screws two screws to each side of the battery bay Palm Rest Screws on Bottom of Computer M2 x 4 mm Mz 5 x 6 mm M2 6 x 1 8 mm 1 M2 5 x 6 mm screws 4 2 M2 6 x 1 8 mm screws 4 3 M2 x 4 mm screws 2 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 Critical Component Shield M2 x 4 mm M2 x 4 mm screws 6 one screw may be captive 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 Ed NOTE At
15. e display assembly 4 Remove the palm rest Cooling Fan Removal M2 5 x 8 mm iso 2 5 x emm screws 5 ence a an eender able 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 Back to Contents Page Reserve Battery Dell Latitude C400 Service Manual Removing the Reserve Battery Replacing the Reserve Battery Removing the Reserve Battery NOTI CE 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 NOTI CE Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries NOTI CE To avoid ESD ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer 000 NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the keyboard 3 Remove the display assembly 4 Remove the palm rest Reserve Battery Removal T E P h e on di din du l reserve battery connector on system board 2
16. eyboard 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 5 Rotate the keyboard toward the front of the computer and place it face down on the palm rest NOTICE Do not pull on the keyboard flex cable Keyboard Removal 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 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 3 Connect the keyboard flex cable to its interface connector on the system board 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 The white line may reappear after the connector is closed this should not indicate a problem with the connection NOTICE Position the keyboard flex cable so that it is not pinched when you replace the keyboard in the bottom case Keyboard Replace
17. f the hard drive 2 Ground yourself by touching a metal connector on the back of the computer UJ Turn the computer over Remove the M2 5 x 12 mm screw from the hard drive door Hard Drive Removal L M2 5x 12 mm bottom of computer M2 5 x 12 mm screw 1 3 hard drive door aLL Y T 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 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 NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the hard drive 2 Remove the keyboard Wireless Network Adapter 1 wireless cab
18. ing 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 Back to Contents Page 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 Docking Connector 50 51 100 Pin Signer Pin Signa 54 DOCKED 104 GND 154 SADO sa voco m4 ow me swo 8 PD6 PD7 GND DOCK SPKR DOCK MIC DOCK LINE DOCK CDROM GND N POWER SW QP S 10 11 12 13 14 15 O 17 18 I m SM EN FDD LPT N o UO A gt O O 0 2 210 OlojJjz U CTLED PWRLED OCK PWR SRC OCK PWR SRC OCK PWR SRC D SN J G J Ul lt w O O Ui Ul lt lt sas C 0 olo A zx SN J OCK_PWR_SRC OCK_PWR_SRC OCK_PWR_SRC U Q 0 0 2 J OCK_ DC_IN CK DC IN CK DC IN CK DC IN OCK_ DC_IN OCK_ DC_IN OCK_ DC_IN O JIJO JIJ g 9 10 KA A ER EN E av 18 20 28 D 30 3 32 EB 40 a a2 a3 LN 45 46 a 58 59 USB VD2 USB VD2 DOCKOC1 RUN ON GND 61 62 63 DOCK SCLK DOCK LRCK DOCK MCLK GND 12V 65 67 AFD ERROR ACK GND INIT SLCT_IN BUSY 70 71 72
19. les 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 Replacing the Wireless Network Adapter The wireless card is keyed to the connector Make sure the card is fully seated in the socket before attempting to pivot it down into place Back to Contents Page 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 0000 NOTI CE Read Preparing to Work Inside the Computer before performing the following procedure 1 Remove the battery 2 Remove the hard drive 3 Remove the center cover 4 Close the display 5 Turn the computer over and remove the two M2 5 x 6 mm screws at the bottom back corners of the computer Display Screws M2 5 x 6 mm M2 5 x 6 mm screws 2 6 Turn the computer right side up and open the display 180 degrees Display Assembly M2 5x 12mm 1 display feed flex cable 2 M2 5 x 12 mm scre
20. ment 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 ALT keys to help control tab slot alignment When the keyboard appears to be completely seated confirm that the front edge of the keyboard is aligned with the edge of the palm rest before proceeding 5 Replace the four M2 x 4 mm screws at the back of the keyboard 6 Replace the center cover Back to Contents Page 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 K NOTE This procedure covers removing and replacing the memory module located under the memory module modem cover on the bottom of the computer A second memory module resides on the upper surface of the system board under the critical component shield To replace the memory module under the critical component shield perform the procedure for removing the palm rest up to and including removal of the critical component shield
21. r the system setup program and reset the boot sequence with the appropriate drive if required Press lt ESC gt to exit the system setup program Remove the Flash BIOS update floppy disk or CD from the drive and restart the computer Back to Contents Page 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 Remove the hard drive 2 Remove the keyboard 3 Remove the display assembly 4 Remove the palm rest Audio Board Removal H M2 x 4 mm 1 2 3 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 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 boa
22. rd connector Back to Contents Page 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 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 PC Card or plastic blank if present from the PC Card slot 2 Remove the hard drive 3 Remove the keyboard 4 Remove the display assembly 5 Remove the palm rest 6 Remove the wireless network adapter if present 7 Remove the modem daughter card if present 8 Remove all installed memory modules 9 Remove the audio board System Board Removal M2 x 4 mm i 2 reserve battery cable 3 connector for fan extender cable 4 hard drive connector 5 M2 x 4 mm screw 1 memory module socket 7 guide pins 2 5 mm hex nuts 4 7 mm hex nuts 2
23. tery before you service the computer Remove the battery from the battery bay To dissipate any static electricity while you work use a wrist grounding strap or periodically touch an unpainted metal surface 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 internal components by their edges not by their pins Recommended Tools The procedures in this manual require the following tools e 1 magnetized Phillips screwdriver e Small flat blade screwdriver e 5 mm nut driver e mm nut driver Needle nose pliers Flash BIOS update program floppy disk or CD Computer Orientation 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 iz H H H M2 x 4 mm M2 5x6mm MZb5x12mm M26 x 1 6 mm o NOTI CE 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 Hard Drive Door Modem Daughter Card 1 each 1 each M2 5 x 12 mm Keyboard Display Assembly 4 each 2 each 2 each 1 1 11 LR LR M2 5x 6 mm M25 x 123 mm Display Bezel Palm Rest to Bottom Case 6 each 6 each 4 to 4 each 2 each e
24. this point the memory module under the critical component shield can be replaced Palm Rest Removal 1 M2 5 x 6 mm screws 6 3 palm rest flex cable 2 LED cable 10 11 12 Remove the six M2 5 x 6 mm screws that secure the palm rest to the system board Disconnect the LED and palm rest flex cables If a Mini PCI wireless card is installed disconnect the two wireless cables from the card 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 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 The white line may reappear after the connector is closed this should not indicate a problem with the connection Back to Contents Page 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 Remove the keyboard 3 Remove th
25. ws 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 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 NOTICE Read Preparing to Work Inside the Computer before performing the following procedure 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 M2 x 4 mm display latch 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 Back to Contents Page Palm Rest Dell Latitude C400 Service Manual Removing the Palm Rest Q Replacing the Palm Rest Removing the Palm Rest NOTI CE Disconnect th
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