Dell C640 manual

Dell™ Latitude™ C540/C640 Service Manual Before You Begin System Components Hard Drive Memory Modules, Mini PCI Card, and Modem Keyboard Display Assembly, Display Latch, and Hinge Covers Palm Rest Microprocessor Thermal Cooling Assembly Microprocessor Module Hybrid Cooling Fan Reserve Battery Flashing the BIOS Speaker Assemblies System Board Ba[...]

Back to Contents Page Before You Begin Dell™ Latitude™ C540/C640 Service Manual Preparing to Work Inside the Computer Recommended Tools Screw Identification Preparing to Work Inside the Computer CAUTION: Before working inside your computer, read the safety instructions in your System Information Guide . CAUTION: Only a certified service technic[...]

Recommended Tools The procedures in this manual require the following tools: #1 magnetized Phillips screwdriver ¼- inch flat - blade screwdriver Small plastic scribe Microprocessor extractor 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 compo[...]

NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length. Ensure that the screw is properly aligned with its corresponding hole, and avoid overtightening. Hard Drive Door: (1 each) Memory Module Cover: (2 captive screws) (1 each) NOTE: The single screw is one of the five keyboard screws. Modem to System Board: (2 e[...]

Display Latch: (2 each) (2 each) Palm Rest to Bottom Case: (3 each) (5 each) Hybrid Cooling Fan: (2 each) (1 each) System Board to Bottom Case: (10 each) Back to Contents Page[...]

Back to Contents Page System Components Dell™ Latitude™ C540/C640 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 document assumes that a part can be r[...]

9 fan guard Back to Contents Page[...]

Back to Contents Page Hard Drive Dell™ Latitude™ C540/C640 Service Manual Removing the Hard Drive 1 . Save and close any open files, exit any open programs, and then shut down the computer. NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries. NOTICE: The hard drive is very sensiti[...]

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 . Lift the hard drive door until you hear a click. Push the hard drive until it is fully seated in the hard drive bay. 2 . Press the hard drive door down. 3 . R[...]

Back to Contents Page Memory Modules, Mini PCI Card, and Modem Dell™ Latitude™ C540/C640 Service Manual Memory Modules Mini PCI Card Modem Memory Modules Removing the Memory Module Cover NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries. NOTICE: To avoid ESD, ground yourself by [...]

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 proce[...]

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. 2 . Align the notch in the memory- module edge connector with the tab in the socket. 3 . Slide the edge connector of the module firmly into the socket at a 4[...]

1 antenna connectors on card (2) 2 antenna cables (2) Replacing the Mini 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. NOTICE: The connectors are keyed for correct insertion; do not force the connections. 2 . Pivot the Mini PCI card down until it snaps into the inner tabs o[...]

NOTICE: Do not pull on the modem cable. Pull from the modem connector to disconnect the cable. 3 . Pull straight up on the attached pull- tab to lift the modem out of its connector on the system board and disconnect the modem cable. 1 M2 x 3 - mm screws (2) 2 modem connector 3 modem cable 4 pull -tab Replacing the Modem 1 . Connect the modem cable [...]

Back to Contents Page Keyboard Dell™ Latitude™ C540/C640 Service Manual 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. NOTI[...]

5 . To release the keyboard from the palm rest, use a small, flat - blade screwdriver or plastic scribe to pry up the right edge of the keyboard near the blank key. 1 keyboard 2 track stick 3 blank key 4 palm rest 6 . Lift the keyboard straight up about an inch and then rotate it forward toward the front of the computer, until the key face is resti[...]

1 boss supports (5) 2 track stick cable 3 keyboard flex cable 4 keyboard interface connector 5 orientation label 8 . Remove the keyboard from the bottom case. Replacing the Keyboard 1 . Place the keyboard on the palm rest at the front of the computer with the keys face down and the connector toward the back of the computer. NOTICE: To avoid damage [...]

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Back to Contents Page Display Assembly, Display Latch, and Hinge Covers Dell™ Latitude™ C540/C640 Service Manual Display Assembly Display Latch Hinge Covers 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 a[...]

1 M2 x 3 - mm screws (2) 2 top cover 3 center control cover 4 M2.5 x 5 - mm screws (5) 5 bottom case 6 display - feed flex cable 7 EMI shield bracket 8 . Remove the two M2 x 3 - mm screws that secure the display - feed flex cable to the system board. NOTICE: When reconnecting the display - feed flex cable connector to the system board, push down on[...]

1 M2 x 3 - mm screws (2) 2 pull -tab 3 display - feed cable connector 4 interface connector 9 . Pull up on the pull - tab that is attached to the display - feed flex cable connector to remove it from the interface connector on the system board. 10 . Pivot the display assembly up to a 90 - degree angle and lift it out of the bottom case.[...]

1 rubber screw covers (6) 5 M2 x 4 - mm screws (5) 2 M2.5 x 5 - mm screws (6) 6 display - feed flex cable 3 display bezel 7 flex- cable retention bracket 4 top cover 8 display panel Removing the Display Bezel NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries. NOTICE: To avoid ESD, g[...]

2 . Remove the display assembly . 3 . Use a plastic scribe to pry the six rubber screw covers out of the screw holes located on the front of the bezel. 4 . Remove the six M2.5 x 5 - mm screws located on the front of the bezel. NOTICE: Carefully separate the bezel from the top cover to avoid damage to the bezel. 5 . Starting at the bottom of the dis[...]

1 display panel connector 2 top flex cable connector 3 pull -tab 4 bottom flex cable connector 5 inverter connector 9 . Remove the tape that secures the display panel connector and the tape that secures the middle of the display - feed flex cable to the display panel. 10 . Pull the top flex cable connector down and away to remove it from the displa[...]

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. Removing the Display Latch 1 . Remove the hard drive . 2 . Remove the display assembly . 3 . Remove th[...]

Hinge Covers Removing the Hinge Covers 1 . Remove the display assembly . 2 . Rotate the hinges forward at an angle of approximately 90 degrees to the front of the display assembly. 3 . To remove the hinge covers, slide them off the hinges. Replacing the Hinge Covers 1 . Attach the display assembly to the bottom case. 2 . Close the display. 3 . Snap[...]

1 right hinge cover 2 left hinge cover Back to Contents Page[...]

Back to Contents Page Palm Rest Dell™ Latitude™ C540/C640 Service Manual 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. NO[...]

6 . Turn the computer over, and remove the three M2 x 3 - mm screws that secure the palm rest to the bottom case: a . Remove the two M2 x 3 - mm screws that are located on the back edge of the bottom case, underneath the display assembly. b . Remove the M2 x 3 - mm screw located near the right side of the bottom case, next to the microprocessor the[...]

Back to Contents Page Microprocessor Thermal Cooling Assembly Dell™ Latitude™ C540/C640 Service Manual Removing the Microprocessor Thermal Cooling Assembly 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 o[...]

pry the assembly up and out of the system board. Replacing the Microprocessor Thermal Cooling Assembly NOTICE: To ensure proper thermal operation, always install a new, compatible thermal cooling assembly along with a new microprocessor. 1 . Place the right side of the microprocessor thermal cooling assembly under the palm rest and lower the assemb[...]

Back to Contents Page Microprocessor Module Dell™ Latitude™ C540/C640 Service Manual Removing the Microprocessor Module 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 sur[...]

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. 3 . Remove the microprocessor thermal cooling assembly . NOTICE: When removing the microprocessor module, pull the module straig[...]

Back to Contents Page Hybrid Cooling Fan Dell™ Latitude™ C540/C640 Service Manual Removing the Hybrid 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 o[...]

7 . Disconnect the fan power cable from the system - board interface connector and remove the hybrid cooling fan. NOTE: The fan power cable is long, and can be pulled out from under the EMI shield to provide access to the connector. NOTICE: Do not block the keyboard screw hole when reinstalling the fan. Route the fan power cable under the spring fi[...]

Back to Contents Page Reserve Battery Dell™ Latitude™ C540/C640 Service Manual 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 [...]

2 reserve battery tray 3 reserve battery cable 4 reserve battery connector on system board 5 speaker cables 6 opening for reserve battery cable Replacing the Reserve Battery 1 . Connect the reserve battery cable to the reserve battery connector on the system board and then route the battery cable through the opening in the EMI shield to the battery[...]

Back to Contents Page Flashing the BIOS Dell™ Latitude™ C540/C640 Service Manual To update the basic input/output system (BIOS): 1 . Ensure that the AC adapter is plugged in and that the main battery is installed properly. 2 . Turn on the computer and press to enter the system setup program. 3 . Reset the boot sequence to boot first from the fl[...]

Back to Contents Page Speaker Assemblies Dell™ Latitude™ C540/C640 Service Manual Removing the Speaker Assemblies 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 o[...]

1 right speaker 2 palm -rest screw posts (2) 3 bottom case holders (2) 4 left speaker[...]

1 antenna cable 7 antenna cable 2 speaker interface cable 8 right speaker holder 3 in- line connector 9 mounting ring 4 left speaker 10 right speaker 5 mounting ring 11 speaker interface cable 6 left speaker holder 1 . Remove the hard drive . 2 . Remove the keyboard . 3 . Remove the display assembly . 4 . Remove the palm rest .[...]

5 . Disconnect the speaker interface cables. (Do not attempt to disconnect the antenna cables.) NOTICE: Do not pull the antenna wire when removing the speaker. NOTICE: Handle the speaker assemblies and speakers carefully to avoid damaging the speaker cones. 6 . Remove the speaker assemblies by pulling them straight out of the bottom case. 7 . Remov[...]

Back to Contents Page System Board Dell™ Latitude™ C540/C640 Service Manual Removing the System Board The system board's BIOS chip contains the service tag sequence, which is also visible on a bar code label on the bottom of the computer. The replacement kit for the system board includes a CD that provides a utility for transferring the se[...]

1 fan guard 2 M2.5 x 5 - mm screws (9) 10 . Turn the computer over and remove the M2.5 x 5 - mm screw, which is labeled "circle B" with an arrow on the front center of the system board by the battery connector. 1 M2.5 x. 5 - mm screw (1) 2 audio connector locations; pull outward here[...]

11 . Remove the speaker assemblies from the bottom case. 12 . Pull the right side of the bottom case, next to the audio connectors, away from the system board as you simultaneously lift the front of the system board out and away from the bottom case. Replacing the System Board 1 . Install the microprocessor module on the replacement system board. 2[...]

Back to Contents Page Battery and Module Bay Latches Dell™ Latitude™ C540/C640 Service Manual Removing the Battery and Module Bay Latches 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 u[...]

1 bumps (2 per latch) 5 latch release buttons (2) 2 slider 6 snap tabs (2 per latch assembly) 3 spring 7 upper latch assemblies (2) 4 bottom case 8 wear rib Replacing the Battery and Module Bay Latches 1 . If you are replacing the upper latch assembly: a . Slide the spring onto the slider, and install the upper latch assembly in the holding feature[...]

Back to Contents Page Pin Assignments for I/O Connectors Dell™ Latitude™ C540/640 Service Manual USB Connector Pin Signal 1 VCC 2 –Data 3 +Data 4 Ground Serial Connector 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#/5V 11 BUSY/MTR# 2 PD0/INDEX# 12 PE/WDATA# 3 PD1/TRK0# 13 SLCT/WGATE# 4 PD2/WP# 14 AFDF# 5 PD3/RDATA# 15 ERROR#HDSEL# 6 PD4/DSKCHG# 16 INIT#/DIR# 7 PD5F 17 SLCT_IN#STEP# 8 PD6F 18–23 GND 9 PD7F 24 DFDD/LPT# 10 ACK#/DRV# 25 GND Video Connector Pin Signal Pin Signal 1 RED 9 CRT_VCC 2 GREEN 10 GND 3 BLUE 11 MSEN# 4 NC 12[...]

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 S -Video Pin Signal 1 GND 2 GND 3 DLUMA - L 4 DCRMA - L Composite Video Pin Signal[...]

5 NC 6 DCMPS - L 7 GND Docking Connector Pin Signal Pin Signal 1 STRB#/5V 101 VGA_GRN 2 PD0 102 GND 3 PD1 103 VGA_RED 4 PD2 104 GND 5 PD3 105 VGA_BLU 6 PD4 106 DOCK_SD/MODE 7 PD5 107 D_IRTX 8 PD6 108 D_IRRX 9 PD7 109 GND 10 GND 110 SPIRQB# 11 DOCK_SPKR 111 SPIRQC# 12 DOCK_MIC 112 DAT_DDC2 13 DOCK_LINE 113 CLK_DDC2 14 DOCK_CDROM 114 SPAR 15 GND 115 [...]

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# 34 +5VDOCK 134 GND 35 GND 135 SWRPRT# 36 DOCK_PWR_SRC 136 SDSKCHG#/DRQ 37 DOCK_PWR_SRC 137 SDIR# 38 DOCK_PWR_SRC 138 STRK0# 39 DOCK_PWR_SRC 139 SSTEP# 40 GND 140[...]

66 DOCK_MCLK 166 SAD10 67 GND 167 SAD11 68 +12V 168 SAD12 69 AFD# 169 GND 70 ERROR# 170 SAD13 71 ACK# 171 SAD14 72 GND 172 SAD15 73 INIT# 173 SAD16 74 SLCT_IN# 174 SC/BE1# 75 BUSY 175 CD/BE2# 76 PE 176 GND 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 [...]