dell latitude c540 User Manual
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![Page 66
System Board: Dell Latitude C540/C640 Service Manual
2. Install the replacement system board: a. Insert the external microphone and headphone connectors through the bottom case.
b. Replace the six M2.5 x 5-mm screws, starting on the right side of the bottom case.
c. Replace the fan guard, inserting the tab into the bottom case, and repla\
ce the three M2.5 x 5-mm screws. Replacing the screw opposite the tab first\
makes it easier to insert and replace the other two screws.
3. Replace the...](http://img.usermanuals.tech/thumb/19/48080/w64_dell-latitude-c540-service-manual-65.png "Page 66
System Board: Dell Latitude C540/C640 Service Manual
2. Install the replacement system board: a. Insert the external microphone and headphone connectors through the bottom case.
b. Replace the six M2.5 x 5-mm screws, starting on the right side of the bottom case.
c. Replace the fan guard, inserting the tab into the bottom case, and repla\
ce the three M2.5 x 5-mm screws. Replacing the screw opposite the tab first\
makes it easier to insert and replace the other two screws.
3. Replace the...")
![Page 68
Battery and Module Bay Latches: Dell Latitude C540/C640 Service Manual
1 bumps (2 per latch) 5latch release buttons (2)
2 slider 6snap tabs (2 per latch
assembly)
3 spring 7upper latch assemblies (2)
4 bottom case 8wear 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 i\
n the holding feature on the inside of the bottom case.
b. Ensure that the slider is inserted into the...](http://img.usermanuals.tech/thumb/19/48080/w64_dell-latitude-c540-service-manual-67.png "Page 68
Battery and Module Bay Latches: Dell Latitude C540/C640 Service Manual
1 bumps (2 per latch) 5latch release buttons (2)
2 slider 6snap tabs (2 per latch
assembly)
3 spring 7upper latch assemblies (2)
4 bottom case 8wear 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 i\
n the holding feature on the inside of the bottom case.
b. Ensure that the slider is inserted into the...")
![Page 69
Battery and Module Bay Latches: Dell Latitude C540/C640 Service Manual
with the two bumps is facing the back of the case, and that the side wit\
h
the wear rib is facing the front of the case.
NOTE: The latch will not function properly if the slider is oriented incorrect\
ly.
2. Hold down the upper latch assembly and snap in the new latch release but\
ton through the bottom case, ensuring that the snap tabs are fully engaged i\
n the
upper latch assembly.
3. Ensure that the newly installed latch...](http://img.usermanuals.tech/thumb/19/48080/w64_dell-latitude-c540-service-manual-68.png "Page 69
Battery and Module Bay Latches: Dell Latitude C540/C640 Service Manual
with the two bumps is facing the back of the case, and that the side wit\
h
the wear rib is facing the front of the case.
NOTE: The latch will not function properly if the slider is oriented incorrect\
ly.
2. Hold down the upper latch assembly and snap in the new latch release but\
ton through the bottom case, ensuring that the snap tabs are fully engaged i\
n the
upper latch assembly.
3. Ensure that the newly installed latch...")
![Page 70
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
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
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Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
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
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![Page 71
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
Pin Signal PinSignal
1 DCD 6DSR
2 RXDA 7RTS
3 TXDA 8CTS
4 DTR 9RI
5 GND
Parallel Connector
Pin Signal PinSignal
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Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
Pin Signal PinSignal
1 DCD 6DSR
2 RXDA 7RTS
3 TXDA 8CTS
4 DTR 9RI
5 GND
Parallel Connector
Pin Signal PinSignal
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![Page 72
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
1STRB#/5V 11BUSY/MTR#
2 PD0/INDEX# 12PE/WDATA#
3 PD1/TRK0# 13SLCT/WGATE#
4 PD2/WP# 14AFDF#
5 PD3/RDATA# 15ERROR#HDSEL#
6 PD4/DSKCHG# 16INIT#/DIR#
7 PD5F 17SLCT_IN#STEP#
8 PD6F 18–23GND
9 PD7F 24DFDD/LPT#
10 ACK#/DRV# 25GND
Video Connector
Pin Signal PinSignal
1 RED 9CRT_VCC
2 GREEN 10GND
3 BLUE 11MSEN#
4 NC 12DAT_DDC2
5 GND 13HSYNC
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Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
1STRB#/5V 11BUSY/MTR#
2 PD0/INDEX# 12PE/WDATA#
3 PD1/TRK0# 13SLCT/WGATE#
4 PD2/WP# 14AFDF#
5 PD3/RDATA# 15ERROR#HDSEL#
6 PD4/DSKCHG# 16INIT#/DIR#
7 PD5F 17SLCT_IN#STEP#
8 PD6F 18–23GND
9 PD7F 24DFDD/LPT#
10 ACK#/DRV# 25GND
Video Connector
Pin Signal PinSignal
1 RED 9CRT_VCC
2 GREEN 10GND
3 BLUE 11MSEN#
4 NC 12DAT_DDC2
5 GND 13HSYNC
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![Page 73
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
6GND 14VSYNC
7 GND 15CLK_DDC2
8 GND
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:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (4 of 1\
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Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
6GND 14VSYNC
7 GND 15CLK_DDC2
8 GND
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
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![Page 74
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
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
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Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
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
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![Page 75
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
Pin Signal PinSignal
1 STRB#/5V 101VGA_GRN
2 PD0 102GND
3 PD1 103VGA_RED
4 PD2 104GND
5 PD3 105VGA_BLU
6 PD4 106DOCK_SD/MODE
7 PD5 107D_IRTX
8 PD6 108D_IRRX
9 PD7 109GND
10 GND 110SPIRQB#
11 DOCK_SPKR 111SPIRQC#
12 DOCK_MIC 112DAT_DDC2
13 DOCK_LINE 113CLK_DDC2
14 DOCK_CDROM 114SPAR
15 GND 115SPME#
16 M_SEN# 116GND
17 POWER_SW# 117SSERR#
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Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
Pin Signal PinSignal
1 STRB#/5V 101VGA_GRN
2 PD0 102GND
3 PD1 103VGA_RED
4 PD2 104GND
5 PD3 105VGA_BLU
6 PD4 106DOCK_SD/MODE
7 PD5 107D_IRTX
8 PD6 108D_IRRX
9 PD7 109GND
10 GND 110SPIRQB#
11 DOCK_SPKR 111SPIRQC#
12 DOCK_MIC 112DAT_DDC2
13 DOCK_LINE 113CLK_DDC2
14 DOCK_CDROM 114SPAR
15 GND 115SPME#
16 M_SEN# 116GND
17 POWER_SW# 117SSERR#
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![Page 76
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
18QPCIEN# 118SPERR#
19 S1.6M_EN# 119SLOCK#
20 DFDD/LPT# 120SSTOP#
21 GND 121GND
22 NC 122SDEVSEL#
23 NC 123STRDY#
24 D_ATCTLED 124SIRDY#
25 D_PWRLED 125SFRAME#
26 DOCK_PWR_SRC 126SCLKRUN#
27 DOCK_PWR_SRC 127GND
28 DOCK_PWR_SRC 128SGNTA#
29 GND 129SREQA#
30 +5VDOCK 130SGNT0#
31 +5VDOCK 131SREQ0#
32 +5VDOCK 132SPCIRST#
33 +5VDOCK 133SH1SEL#
34 +5VDOCK 134GND
35 GND 135SWRPRT#
36 DOCK_PWR_SRC 136SDSKCHG#/DRQ
37 DOCK_PWR_SRC...](http://img.usermanuals.tech/thumb/19/48080/w64_dell-latitude-c540-service-manual-75.png "Page 76
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\
al
18QPCIEN# 118SPERR#
19 S1.6M_EN# 119SLOCK#
20 DFDD/LPT# 120SSTOP#
21 GND 121GND
22 NC 122SDEVSEL#
23 NC 123STRDY#
24 D_ATCTLED 124SIRDY#
25 D_PWRLED 125SFRAME#
26 DOCK_PWR_SRC 126SCLKRUN#
27 DOCK_PWR_SRC 127GND
28 DOCK_PWR_SRC 128SGNTA#
29 GND 129SREQA#
30 +5VDOCK 130SGNT0#
31 +5VDOCK 131SREQ0#
32 +5VDOCK 132SPCIRST#
33 +5VDOCK 133SH1SEL#
34 +5VDOCK 134GND
35 GND 135SWRPRT#
36 DOCK_PWR_SRC 136SDSKCHG#/DRQ
37 DOCK_PWR_SRC...")
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al Pin Signal PinSignal 1 DCD 6DSR 2 RXDA 7RTS 3 TXDA 8CTS 4 DTR 9RI 5 GND Parallel Connector Pin Signal PinSignal file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (2 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 1STRB#/5V 11BUSY/MTR# 2 PD0/INDEX# 12PE/WDATA# 3 PD1/TRK0# 13SLCT/WGATE# 4 PD2/WP# 14AFDF# 5 PD3/RDATA# 15ERROR#HDSEL# 6 PD4/DSKCHG# 16INIT#/DIR# 7 PD5F 17SLCT_IN#STEP# 8 PD6F 18–23GND 9 PD7F 24DFDD/LPT# 10 ACK#/DRV# 25GND Video Connector Pin Signal PinSignal 1 RED 9CRT_VCC 2 GREEN 10GND 3 BLUE 11MSEN# 4 NC 12DAT_DDC2 5 GND 13HSYNC file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (3 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 6GND 14VSYNC 7 GND 15CLK_DDC2 8 GND 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:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (4 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 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 file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (5 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al Pin Signal PinSignal 1 STRB#/5V 101VGA_GRN 2 PD0 102GND 3 PD1 103VGA_RED 4 PD2 104GND 5 PD3 105VGA_BLU 6 PD4 106DOCK_SD/MODE 7 PD5 107D_IRTX 8 PD6 108D_IRRX 9 PD7 109GND 10 GND 110SPIRQB# 11 DOCK_SPKR 111SPIRQC# 12 DOCK_MIC 112DAT_DDC2 13 DOCK_LINE 113CLK_DDC2 14 DOCK_CDROM 114SPAR 15 GND 115SPME# 16 M_SEN# 116GND 17 POWER_SW# 117SSERR# file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (6 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 18QPCIEN# 118SPERR# 19 S1.6M_EN# 119SLOCK# 20 DFDD/LPT# 120SSTOP# 21 GND 121GND 22 NC 122SDEVSEL# 23 NC 123STRDY# 24 D_ATCTLED 124SIRDY# 25 D_PWRLED 125SFRAME# 26 DOCK_PWR_SRC 126SCLKRUN# 27 DOCK_PWR_SRC 127GND 28 DOCK_PWR_SRC 128SGNTA# 29 GND 129SREQA# 30 +5VDOCK 130SGNT0# 31 +5VDOCK 131SREQ0# 32 +5VDOCK 132SPCIRST# 33 +5VDOCK 133SH1SEL# 34 +5VDOCK 134GND 35 GND 135SWRPRT# 36 DOCK_PWR_SRC 136SDSKCHG#/DRQ 37 DOCK_PWR_SRC 137SDIR# 38 DOCK_PWR_SRC 138STRK0# 39 DOCK_PWR_SRC 139SSTEP# 40 GND 140SDRV1# 41 DOCK_+DC_IN 141GND 42 DOCK_+DC_IN 142SMRT1# 43 DOCK_+DC_IN 143SWRDATA# 44 DOCK_+DC_IN 144SWGATE# file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (7 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 45DOCK_+DC_IN 145SRDATA# 46 DOCK_+DC_IN 146SINDEX# 47 DOCK_+DC_IN 147GND 48 DOCK_+DC_IN 148NC 49 GND 149+5VALW 50 LOW_PWR 150NC 51 HSYNC 151GND 52 VSYNC 152CLK_SPCI 53 GND 153GND 54 DOCKED 154SAD0 55 USB_VD1+ 155SAD1 56 USB_VD1– 156SAD2 57 GND 157SAD3 58 USB_VD2+ 158SAD4 59 USB_VD2– 159SAD5 60 DOCKOCI# 160SAD6 61 RUN_ON# 161GND 62 GND 162SAD7 63 NC 163SAD8 64 DOCK_SCLK 164SC/BE0# 65 DOCK_LRCK 165SAD9 66 DOCK_MCLK 166SAD10 67 GND 167SAD11 68 +12V 168SAD12 69 AFD# 169GND 70 ERROR# 170SAD13 71 ACK# 171SAD14 file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (8 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 72GND 172SAD15 73 INIT# 173SAD16 74 SLCT_IN# 174SC/BE1# 75 BUSY 175CD/BE2# 76 PE 176GND 77 SLCT 177SAD17 78 GND 178SAD18 79 DAT_SMB 179SAD19 80 DCLK_SMB 180SAD20 81 SMB_INIT# 181SAD21 82 GND 182GND 83 DAT_DOCKSM1 183SAD22 84 CLK_DOCKSM1 184SAD23 85 DAT_DOCKKBD 185SAD24 86 CLK_DOCKKBD 186SC/BE3# 87 GND 187SAD25 88 RI0 188GND 89 CTS0 189SAD26 90 RTS0 190SAD27 91 DSR0 191SAD28 92 GND 192SAD29 93 DTR0 193SAD30 94 TXD0# 194SAD31 95 RXD0# 195GND 96 DCD0 196NC 97 NC 197NC 98 +5VSUS 198NC file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (9 of 1\ 0) [2/28/2004 7:57:58 AM]
Pin Assignments for I/O Connectors: Dell Latitude C540/C640 Service Manu\ al 99NC 199NC 100 NC 200GND Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c540-640/pinouts.htm (10 of \ 10) [2/28/2004 7:57:58 AM]