Dell Latitude C840 Service Manual Download

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System Upgrades: Dell Latitude C840 Service Manual

Mini PCI Card

You must remove the optional Mini PCI wireless modem (if installed) before the system board can be

removed. A wireless modem card must be connected to the internal antenna of the computer.

NOTICE:

Disconnect the computer and attached devices from electrical outlets and remove any

installed batteries.

NOTICE:

To avoid ESD, ground yourself by using a wrist grounding strap or by periodically

touching unpainted metal on the computer.

Mini PCI Card Cover

M2.5 x 20-mm screw

Removing the Mini PCI Card

1. Follow the instructions in "

Preparing to Work Inside the Computer

2. Remove the M2.5 x 20-mm screw and then remove the Mini PCI card cover.

file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/C840/C840_SERVICE_MANUAL/upgrades.htm (6 of 8)6/21/2004 1:36:13 AM

Summary of Contents for Latitude C840

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: ...r Card Mini PCI Card Keyboard Display Display Overview Hinge Cover Display Assembly Display Bezel Display Panel Display Latch Microprocessor Thermal Cooling Assembly Microprocessor Module Video Graphics Board Palm Rest Reserve Battery System Board Battery and Module Bay Latches Battery Charger Board LED Board Fan RJ 11 RJ 45 Module Pin Assignments for I O Connectors Notes Notices and Cautions file...

Page 3: ...rosoft 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 This product incorporates copyright protection technology that is protected by ...

Page 4: ...rking inside the computer 1 Ensure that the work surface is flat and clean to prevent scratching the computer cover 2 Save any work in progress and exit all open programs 3 Turn off the computer and all attached devices NOTE Before turning off the computer ensure that the computer is not in a power management mode 4 Ensure that the computer is undocked 5 Disconnect the computer from the electrical...

Page 5: ... metal surface on the computer chassis 13 Handle components and cards by their edges and avoid touching pins and contacts Recommended Tools The procedures in this document require the following tools 1 magnetized Phillips screwdriver Small flat blade screwdriver Microprocessor extractor Nonmarring plastic scribe Flash BIOS update floppy disk or CD provided when needed to upgrade the BIOS Computer ...

Page 6: ...replacing components photocopy the placemat as a tool to lay out and keep track of the component screws The placemat provides the number of screws and the sizes Screw Identification file I SERVICE 20MANUALS DELL 20MANUALS LA ok Latitude C840 C840_SERVICE_MANUAL begin htm 3 of 5 6 21 2004 1 36 09 AM ...

Page 7: ... 4 each one in memory door and one in Mini PCI door Display to Bottom Case M2 5 x 6 mm 3 each 2 at back of computer 1 at display flex cable strain relief Display Bezel Rubber screw covers 4 each Plastic screw covers 2 each M2 5 x 4 mm 6 each Display Panel to Display Mounting Bracket M2 x 3 mm 6 each Flex Cable Mounting Bracket to Top Cover M2 5 x 4 mm 1 each Video Graphics Board M2 5 x 8 3 each fi...

Page 8: ...x 4 mm captive washer 3 each M2 5 x 20 mm 1 each LED Board M2 x 4 mm 2 each Fan M2 x 4 mm 3 each Memory Module Modem Cover M2 5 x 20 mm 1 each Modem Daughter Card M2 x 3 mm 1 each Mini PCI Card M2 5 x 20 mm 1 each Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA ok Latitude C840 C840_SERVICE_MANUAL begin htm 5 of 5 6 21 2004 1 36 09 AM ...

Page 9: ... Latitude C840 Service Manual NOTICE Unless otherwise noted each procedure in this document assumes that a part can be replaced by performing the removal procedure in reverse order file I SERVICE 20MANUALS DELL 20MANUALS LA k Latitude C840 C840_SERVICE_MANUAL system htm 1 of 2 6 21 2004 1 36 10 AM ...

Page 10: ...ver 8 device in module bay 3 microprocessor thermal cooling assembly 9 fixed optical drive 4 system board 10 palm rest 5 hard drive 11 keyboard 6 bottom case Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA k Latitude C840 C840_SERVICE_MANUAL system htm 2 of 2 6 21 2004 1 36 10 AM ...

Page 11: ...ot covered by your warranty Hard Drive NOTICE Disconnect the computer and attached devices from the electrical outlet and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer NOTICE The hard drive is very sensitive to shock Handle the drive by its edges do not squeeze the top of the case and ...

Page 12: ...he Computer 2 Remove the M3 x 5 mm screw 3 Pull the hard drive out Replacing the Hard Drive 1 Push the hard drive into the drive bay until the drive door is flush with the computer case 2 Push down on the drive until it snaps into place 3 Replace the M3 x 5 mm screw in the hard drive door file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL hdd htm 2 of 4 6 21 2004 1 3...

Page 13: ...or by periodically touching unpainted metal on the computer 1 captive screw 2 pull tab Removing the Fixed Optical Drive 1 Follow the instructions in Preparing to Work Inside the Computer 2 Loosen the captive screw on the bottom of the computer 3 Turn the computer over to keep the captive screw from interfering with the pull tab and pull out the pull tab file I SERVICE 20MANUALS DELL 20MANUALS LA 2...

Page 14: ...rive Dell Latitude C840 Service Manual 4 Use the pull tab to remove the fixed optical drive Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL hdd htm 4 of 4 6 21 2004 1 36 11 AM ...

Page 15: ... 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 periodically touching unpainted metal on the computer Removing the Memory Module Modem Cover file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL upgrades htm 1 of 8 6 21 2004 1 36 13 AM ...

Page 16: ...ctions in Preparing to Work Inside the Computer 2 Remove the M2 5 x 20 mm screw from the memory module modem cover 3 Disengage the metal tabs at the opposite end of the cover file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL upgrades htm 2 of 8 6 21 2004 1 36 13 AM ...

Page 17: ...er 2 To release a memory module from its socket spread apart the tabs at each side of the module until the module pops up slightly 3 Lift the memory module out of its socket Replacing the Memory Modules 1 If you only have one memory module install it in the socket labeled DIMM A Install a second file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL upgrades htm 3 of 8 6 21 2...

Page 18: ...ry module modem cover into the bottom case rotate the cover down and replace the M2 5 x 20 mm screw Modem Daughter Card Removing the Modem Daughter Card 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 periodically touching unpainted metal on the computer 1 F...

Page 19: ...ble from the modem daughter card Replacing the Modem Daughter Card NOTICE The cable connectors are keyed for correct insertion Do not force the connections 1 Connect the modem cable to the modem daughter card 2 Use the screw and boss holes at opposite corners of the modem daughter card to align the card and press the card into its connector on the system board 3 Install the M2 x 3 mm screw that se...

Page 20: ...electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer Mini PCI Card Cover 1 M2 5 x 20 mm screw Removing the Mini PCI Card 1 Follow the instructions in Preparing to Work Inside the Computer 2 Remove the M2 5 x 20 mm screw and then remove the Mini PCI card cover file I SER...

Page 21: ...ini PCI Card 1 Align the Mini PCI card with the socket at a 45 degree angle and press the Mini PCI card into the socket 2 Connect the internal antenna cable to the primary antenna connector on the card NOTICE The connectors are keyed for correct insertion do not force the connections 1 internal antenna cable 2 primary antenna connector on card file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C8...

Page 22: ...ivot the Mini PCI card down until it clicks into place 4 Replace the Mini PCI card cover and the M2 5 x 20 mm screw Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL upgrades htm 8 of 8 6 21 2004 1 36 13 AM ...

Page 23: ...ttached devices from electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 M2 5 x 20 mm screws 4 file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL keyboard htm 1 of 4 6 21 2004 1 36 14 AM ...

Page 24: ...led circle K and one labeled circle K M 3 Turn the computer over and open the display NOTICE Be careful when handling the keyboard The keycaps are fragile easily dislodged and time consuming to replace 4 Use a nonmarring plastic scribe under the blank key to pry up the keyboard 1 blank key file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL keyboard htm 2 of 4 6 21 2004 1 ...

Page 25: ...to disengage the tabs at the left end 6 Pivot the keyboard and balance it upright on the left side of the computer 1 keyboard cable 2 keyboard interface connector 3 system board 7 Disconnect the keyboard cable and lay the keyboard aside Replacing the Keyboard file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL keyboard htm 3 of 4 6 21 2004 1 36 14 AM ...

Page 26: ...ft end of the keyboard under the edge of the bottom case and fit the keyboard into place 3 Check that the keyboard is correctly installed The keys should be flush with the left and right surfaces of the palm rest 4 Turn the computer over and reinstall the four M2 5 x 20 mm screws For extra stability you can open the computer slightly and brace the keyboard under each screw as you install the screw...

Page 27: ...play Latch Display Overview NOTICE Disconnect the computer and attached devices from electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL display htm 1 of 10 6 21 2004 1 36 15 AM ...

Page 28: ...e C840 Service Manual 1 display 2 hinge cover 3 M2 5 x 6 mm screws 3 4 bottom case 5 display flex cable file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL display htm 2 of 10 6 21 2004 1 36 15 AM ...

Page 29: ...e to loosen the hinge cover at the back and at each side of the computer 3 Open the computer and use the scribe to pry between the key and the hinge cover until the hinge cover pops off 4 Open the display and lift off the hinge cover Display Assembly file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL display htm 3 of 10 6 21 2004 1 36 15 AM ...

Page 30: ... 1 M2 5 x 6 mm screws 2 1 Remove the hinge cover NOTICE Remove the display flex cable before you remove the display assembly file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL display htm 4 of 10 6 21 2004 1 36 15 AM ...

Page 31: ...e press down on both ends of the connector not in the middle Pressing the middle of the connector can damage fragile components 3 Open the display and from the back of the computer remove the two M2 5 x 6 mm screws labeled circle D that secure the display assembly to the bottom case 4 With the display in an upright position lift the display assembly from the bottom case file I SERVICE 20MANUALS DE...

Page 32: ... Manual 1 M2 5 x 4 mm screws 6 8 M2 x 3 mm screws 6 2 rubber screw covers 4 9 top cover 3 display bezel 10 hinge cover file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL display htm 6 of 10 6 21 2004 1 36 15 AM ...

Page 33: ...he bezel is secured to the top cover with plastic tabs around the sides Use a plastic scribe to help separate the bezel from the top cover Display Panel Removing the Display Panel 1 Remove the hinge cover 2 Detach the display flex cable from the strain relief and the graphics card 3 Remove the display bezel 4 Remove the M2 5 x 4 mm screw that secures the plastic flex cable mounting bracket to the ...

Page 34: ...ble the display panel in the display 1 Connect the flex cable to the two connectors on the back of the display panel 2 Place the display panel in the top cover taking care that the flex cable is in place and is not crushed or crimped file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL display htm 8 of 10 6 21 2004 1 36 15 AM ...

Page 35: ... 5 x 6 mm flex cable strain relief screw and reconnect the flex cable to the graphics card 6 Reinstall the display bezel Display Latch 1 Remove the hinge cover 2 Detach the display flex cable from the strain relief and the graphics card 3 Remove the display bezel 4 Remove the display panel from the top cover 5 Remove the display latch by disengaging the latch and captive spring file I SERVICE 20MA...

Page 36: ...Display Dell Latitude C840 Service Manual Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS L Latitude C840 C840_SERVICE_MANUAL display htm 10 of 10 6 21 2004 1 36 15 AM ...

Page 37: ... electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 microprocessor thermal cooling assembly 2 microprocessor retaining clip Removing the Microprocessor Thermal Cooling Assembly file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL thermal htm ...

Page 38: ...clip by pivoting the top of the screwdriver toward the right side of the computer 1 microprocessor thermal cooling assembly NOTICE To ensure maximum cooling for the microprocessor do not touch the heat transfer areas on the microprocessor thermal cooling assembly The oils in your skin reduce the heat transfer capability of the thermal pads 5 Lift out the thermal cooling assembly Back to Contents P...

Page 39: ...Microprocessor Thermal Cooling Assembly Dell Latitude C840 Service Manual file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL thermal htm 3 of 3 6 21 2004 1 36 16 AM ...

Page 40: ...ally touching unpainted metal on the computer Removing the Microprocessor Module 1 Follow the instructions in Preparing to Work Inside the Computer 2 Remove the keyboard 3 Remove the hinge cover NOTICE To ensure maximum cooling for the microprocessor do not touch the heat transfer areas on the microprocessor thermal cooling assembly The oils in your skin reduce the heat transfer capability of the ...

Page 41: ...loosening the cam screw see Microprocessor Cam Screw a Loosen the cam screw that secures the microprocessor module The location of the screw and the rotation direction may vary with the socket manufacturer look for small icons indicating open and locked positions Microprocessor Cam Screw Example NOTICE Hold the microprocessor down while turning the cam screw to prevent intermittent contact between...

Page 42: ...t insert the microprocessor into the socket and move the microprocessor around slightly until you feel it settle into the socket When the microprocessor module is correctly seated all four corners are aligned to the same height If one or more corners of the module are higher than the others the module is not seated correctly NOTICE Hold the microprocessor down while turning the cam screw to preven...

Page 43: ...sor retaining clip 5 To latch the clip insert a flat blade scribe into the latch mechanism and pivot the top of the scribe away from the clip Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL cpu htm 4 of 4 6 21 2004 1 36 18 AM ...

Page 44: ...e any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 M2 5 x 8 mm screws 3 Removing the Video Graphics Board 1 Follow the instructions in Preparing to Work Inside the Computer 2 Remove the keyboard file I SERVICE 20MANUALS DELL 20MANUALS LA ok Latitude C840 C840_SERVICE_MANUAL vidbd htm 1 of 2 6 ...

Page 45: ...isplay flex cable from the graphics card 5 Remove the three M2 5 x 8 mm screws that secure the video graphics board 6 Separate the video graphics board from the system board connector Replacing the Video Graphics Board 1 Align the three screw holes and press down firmly on the word Dell to seat the board in its connector NOTICE Ensure that the board is correctly and firmly seated before continuing...

Page 46: ...ng unpainted metal on the computer 1 pull loop NOTICE The reserve battery provides power to the computer s time RTC and NVRAM when the computer is turned off Removing the palm rest disconnects the reserve battery and causes the computer to lose the date and time information as well as all user specified parameters in NVRAM If possible copy the information before you disconnect the reserve battery ...

Page 47: ...ove the keyboard 4 Remove the hinge cover 5 Remove the display assembly NOTICE To avoid damaging the palm rest you must first remove the display assembly 6 Turn the computer over 7 Remove the nine M2 5 x 20 mm screws labeled circle P that secure the palm rest to the computer file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL palmrest htm 2 of 4 6 21 2004 1 36 19 AM ...

Page 48: ...e a flat blade scribe between the palm rest and the bottom case of the computer to separate the snaps that secure the palm rest to the bottom case 11 Lift out the palm rest Replacing the Palm Rest When replacing the palm rest screws install the two screws at the back corners of the computer first to help align the palm rest correctly file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SE...

Page 49: ...Palm Rest Dell Latitude C840 Service Manual Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL palmrest htm 4 of 4 6 21 2004 1 36 19 AM ...

Page 50: ...ouching unpainted metal on the computer 1 palm rest bracket 2 reserve battery 3 reserve battery cable 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 NVRAM If possible copy the information before you remove the reserve ...

Page 51: ...de of the palm rest disconnect the palm rest flex cable from the ZIF connector 1 M2 5 x 4 mm screws 4 2 palm rest bracket 3 palm rest flex cable 7 Remove the four M2 5 x 4 mm screws that secure the palm rest bracket 8 While supporting the palm rest flex cable lift out the palm rest bracket and turn it over 9 Disconnect the reserve battery cable file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C...

Page 52: ...ry 1 Seat the reserve battery and press it into place 2 Connect the reserve battery cable 3 Place the palm rest bracket loosely in the palm rest and connect the palm rest flex cable to the ZIF connector 4 Replace the four M2 5 x 4 mm screws that secure the palm rest bracket to the palm rest Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL resbatt h...

Page 53: ...ched devices from electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 M2 5 x 4 mm captive washer screws 3 file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL sysboard htm 1 of 5 6 21 2004 1 36 21 AM ...

Page 54: ...ard drive and the fixed optical drive 3 Remove any installed Mini PCI Cards 4 If migrating the memory remove all installed memory modules 5 Remove if migrating or disconnect the modem daughter card 6 Remove the keyboard 7 Remove the hinge cover 8 Remove the display assembly 9 Remove the palm rest 10 Remove the video graphics board 11 Remove the microprocessor thermal cooling assembly 12 If migrati...

Page 55: ... Disconnect the network cable Do not pull on the cable wires Instead pry up the outer corner of the upper connector until the connectors start to separate file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL sysboard htm 3 of 5 6 21 2004 1 36 21 AM ...

Page 56: ...center of the LED board 16 Lift the front of the system board and work it out of the back panel If necessary to help release the system board pull outward on the top of the plastic near the back left corner of the bottom case see the small arrow at the far left in the following figure System Board file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL sysboard htm 4 of 5 6 21...

Page 57: ...System Board Dell Latitude C840 Service Manual Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL sysboard htm 5 of 5 6 21 2004 1 36 21 AM ...

Page 58: ...TICE Disconnect the computer and attached devices from electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL baylatch htm 1 of 3 6 21 2004 1 36 22 AM ...

Page 59: ...together tweezers work well to eject the latch button from the underside of the bottom case without loosening the upper latch assembly If the upper latch assembly does come loose a Slide the spring onto the slider and reinstall both pieces in the latch housing on the inside of the bottom case b Ensure that the slider is inserted so that the side with the two bumps is facing the back of the bottom ...

Page 60: ...attery and Module Bay Latches Dell Latitude C840 Service Manual Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL baylatch htm 3 of 3 6 21 2004 1 36 22 AM ...

Page 61: ... batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer Removing the Battery Charger Board 1 Follow the instructions in Preparing to Work Inside the Computer 2 Remove the keyboard 3 Remove the hinge cover 4 Remove the display assembly file I SERVICE 20MANUALS DELL 20MANUALS LA k Latitude C840 C840_SERVICE_MANUAL ba...

Page 62: ...e system board connector Replacing the Battery Charger Board Align the screw holes on the battery charger board with the screw holes on the bottom case and then press the battery charger board down into its connector Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA k Latitude C840 C840_SERVICE_MANUAL battch htm 2 of 2 6 21 2004 1 36 23 AM ...

Page 63: ...d attached devices from electrical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 M2 x 4 mm screws 2 file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL led htm 1 of 2 6 21 2004 1 36 24 AM ...

Page 64: ...o M2 x 4 mm screws 4 Lift the LED board away from its connector Replacing the LED Board 1 Align the two screw holes with the two mounting holes on the bottom case and press the board into its connector 2 Replace the two M2 x 4 mm screws Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL led htm 2 of 2 6 21 2004 1 36 24 AM ...

Page 65: ...batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 fan cables 2 M2 x 4 mm screws 3 Removing the Fan 1 Follow the instructions in Preparing to Work Inside the Computer 2 Remove the system board file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL fan htm 1 of 2 6 21 2004 1 36 24 AM...

Page 66: ...om the back panel bracket NOTICE When reconnecting the fan cables connect the shorter cable to the connector closest to the fan Route both cables so that they will not be pinched by the microprocessor thermal cooling assembly Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA 20ok Latitude C840 C840_SERVICE_MANUAL fan htm 2 of 2 6 21 2004 1 36 24 AM ...

Page 67: ...rical outlets and remove any installed batteries NOTICE To avoid ESD ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer 1 network cable 2 bottom case 3 RJ 11 RJ 45 module 4 modem cable Removing the RJ 11 RJ 45 Module file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL rj11_45b htm 1 of 3 6 21 2004 1 36 25 AM ...

Page 68: ...RJ 11 RJ 45 Module When replacing the RJ 11 RJ 45 module hold both cables safely out of the way and snap the housing down into place Then route the modem cable through the vertical slot through the appropriate posts and out through the corner of the memory module modem cutout 1 vertical slot 2 modem cable When replacing the system board ensure that the network cable is safely above the board and o...

Page 69: ...RJ 11 RJ 45 Module Dell Latitude C840 Service Manual Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL rj11_45b htm 3 of 3 6 21 2004 1 36 25 AM ...

Page 70: ... to Contents Page Pin Assignments for I O Connectors Dell Latitude C840 Service Manual USB Connector Pin Signal 1 VCC 2 Data 3 Data 4 Ground Serial Connector file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL pinouts htm 1 of 9 6 21 2004 1 36 27 AM ...

Page 71: ...ice Manual Pin Signal Pin Signal 1 DCD 6 DSR 2 RXDA 7 RTS 3 TXDA 8 CTS 4 DTR 9 RI 5 GND Parallel Connector Pin Signal Pin Signal 1 STRB 11 BUSY file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL pinouts htm 2 of 9 6 21 2004 1 36 27 AM ...

Page 72: ...7 PD5F 17 SLCT_IN 8 PD6F 18 23 GND 9 PD7F 24 DFDD LPT 10 ACK 25 GND Video Connector Pin Signal Pin Signal 1 RED 9 CRT_VCC 2 GREEN 10 GND 3 BLUE 11 MSEN 4 NC 12 DAT_DDC2 5 GND 13 HSYNC 6 GND 14 VSYNC 7 GND 15 CLK_DDC2 8 GND file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL pinouts htm 3 of 9 6 21 2004 1 36 27 AM ...

Page 73: ...ude C840 Service Manual PS 2 Connector Pin Signal 1 DAT_KBD 2 DAT_SM1 3 GND 4 PS2VCC 5 CLK_KBD 6 CLK_SM1 S Video TV Out Connector file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL pinouts htm 4 of 9 6 21 2004 1 36 27 AM ...

Page 74: ...ignal 1 GND 2 GND 3 DLUMA L 4 DCRMA L Composite Video Pin Signal 5 SPDIF 6 DCMPS L 7 SPGND Docking Connector Pin Signal Pin Signal 1 STRB 5V 101 VGA_GRN 2 PD0 102 GND file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL pinouts htm 5 of 9 6 21 2004 1 36 27 AM ...

Page 75: ...15 GND 115 SPME 16 M_SEN 116 GND 17 POWER_SW 117 SSERR 18 QPCIEN 118 SPERR 19 S1 6M_EN 119 SLOCK 20 DFDD LPT 120 SSTOP 21 GND 121 GND 22 NC 122 SDEVSEL 23 NC 123 STRDY 24 D_ATCTLED 124 SIRDY 25 D_PWRLED 125 SFRAME 26 DOCK_PWR_SRC 126 SCLKRUN 27 DOCK_PWR_SRC 127 GND 28 DOCK_PWR_SRC 128 SGNTA 29 GND 129 SREQA 30 5VDOCK 130 SGNT0 31 5VDOCK 131 SREQ0 32 5VDOCK 132 SPCIRST 33 5VDOCK 133 SH1SEL file I S...

Page 76: ... 144 SWGATE 45 DOCK_ DC_IN 145 SRDATA 46 DOCK_ DC_IN 146 SINDEX 47 DOCK_ DC_IN 147 GND 48 DOCK_ DC_IN 148 NC 49 GND 149 5VALW 50 LOW_PWR 150 NC 51 HSYNC 151 GND 52 VSYNC 152 CLK_SPCI 53 GND 153 GND 54 DOCKED 154 SAD0 55 USB_VD1 155 SAD1 56 USB_VD1 156 SAD2 57 GND 157 SAD3 58 USB_VD2 158 SAD4 59 USB_VD2 159 SAD5 60 DOCKOCI 160 SAD6 61 RUN_ON 161 GND 62 GND 162 SAD7 63 NC 163 SAD8 64 DOCK_SCLK 164 S...

Page 77: ...D 77 SLCT 177 SAD17 78 GND 178 SAD18 79 DAT_SMB 179 SAD19 80 DCLK_SMB 180 SAD20 81 SMB_INIT 181 SAD21 82 GND 182 GND 83 DAT_DOCKSM1 183 SAD22 84 CLK_DOCKSM1 184 SAD23 85 DAT_DOCKKBD 185 SAD24 86 CLK_DOCKKBD 186 SC BE3 87 GND 187 SAD25 88 RI0 188 GND 89 CTS0 189 SAD26 90 RTS0 190 SAD27 91 DSR0 191 SAD28 92 GND 192 SAD29 93 DTR0 193 SAD30 94 TXD0 194 SAD31 95 RXD0 195 GND file I SERVICE 20MANUALS DE...

Page 78: ...al 96 DCD0 196 NC 97 NC 197 NC 98 5VSUS 198 NC 99 NC 199 NC 100 NC 200 GND IEEE 1394 Connector Pin Signal 1 TPB 2 TPB 3 TPA 4 TPA Back to Contents Page file I SERVICE 20MANUALS DELL 20MANUALS LA Latitude C840 C840_SERVICE_MANUAL pinouts htm 9 of 9 6 21 2004 1 36 27 AM ...

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