Dell Inspiron 4000 Parts Manual

							Removing and Replacing Parts141
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.
 HINT: To update or 
reflash the BIOS, see the 
Dell Portable Computer 
BIOS Update Guide 
for 
instructions.
Removing the Reserve Battery
 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: Rea d  “Preparing to Work Inside the Computer” before performing 
the following procedure.
1
Remove the hard drive assembly.
2Remove the memory module cover.
3Disconnect the reserve battery cable from the connector on the system 
board assembly located next to the reserve battery.
4Remove the reserve battery from the EMI shield:
aPry the reserve battery free from the foam pad.
bRemove the remnants of the foam pad from the EMI shield.
reserve battery
reserve battery connector 
						

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Replacing the Reserve Battery
1Connect the reserve battery cable to the connector on the system 
board. 
2Position the reserve battery on the EMI shield next to the connector to 
minimize slack in the cable.
System Speaker Assembly
The system speakers are located on the front left and right sides of the 
bottom case assembly. Each speaker assembly is marked with a right and left 
label. Take note of the speaker cable routing in the bottom case assembly so 
that you can replace it correctly.
Removing the Speaker Assembly
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
 NOTICE: To avoid ESD, ground yourself by touching an unpainted metal 
surface or by using a wrist grounding strap.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure. 
						

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1Remove the hard drive assembly.
2Remove the keyboard assembly.
3Turn the computer over and remove the display assembly.
4Remove the palm rest assembly.
5Remove the thermal cooling assembly.
6Disconnect the speaker interface cable connectors.
in-line connector
left speaker
right speaker
right speaker holder
left speaker holder
antenna cable
antenna cable 
						

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 HINT: The left speaker 
has an in-line connector, 
and its cable is shorter 
than the right speaker.
 HINT: Speakers face out 
in the bottom case 
assembly holders. 7
Remove the speaker assemblies by pulling them straight up and out of 
the bottom case assembly.
Replacing the Speaker Assembly
1To replace the speaker assembly, place the mounting ring over the 
front palm rest screw post.
2Slide the speaker assembly down into the bottom case assembly.
System Board Assembly
The system board’s BIOS chip contains the system service tag number, 
which is also visible on a bar-code label on the bottom of the computer. The 
replacement kit for the system board assembly includes a floppy disk that 
provides a utility for transferring the service tag number to the replacement 
system board assembly.
Removing the System Board
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
M2.5 x 5-mm screw (9) 
						

							Removing and Replacing Parts145
 NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or 
by periodically touching an unpainted metal surface on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
1
Remove the hard drive assembly.
2Turn the computer over and remove the keyboard assembly.
3Remove the display assembly.
4Remove the palm rest assembly.
5Verify that all PC Cards or plastic blanks are removed from the PC 
Card slot.
6Verify that the PC Card ejectors do not extend from the PC Card slot.
7Turn the computer upside down, and remove the nine M2.5 x 5-mm 
screws labeled with a “circle B” that secure the system board assembly 
to the bottom case assembly:
aRemove the three M2.5 x 5-mm screws that secure the thermal 
cooling fan protective cover to the bottom case assembly. The 
thermal cooling fan protective cover is located at the back on the 
right side of the bottom case assembly.
bRemove the remaining six M2.5 x 5-mm screws from the bottom 
case assembly. 
						

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8Turn the bottom case assembly right-side up and remove the M2.5 x 5-
mm screw labeled with a white circle on the front center of the system 
board.
9Remove the speakers from the bottom case assembly.
10Pull the right side of the bottom case assembly, next to the external 
headphone and microphone connectors, away from the system board 
assembly as you simultaneously lift the front of the system board 
assembly out and away from the bottom case assembly.
Replacing the System Board
1Install the microprocessor on the replacement system board.
2Connect the right and left speaker to the replacement system board.
3Install the replacement system board:
M2.5 x 5-mm 
screw (1) 
						

							Removing and Replacing Parts147
aInsert the external microphone and headphone connectors 
through the plastic bottom case assembly.
bReplace the nine M2.5 x 5-mm screws, starting on the right side of 
the bottom case assembly.
cReplace the thermal cooling fan protective cover, inserting the tab 
into the bottom case assembly and replacing the three M2 x 4-mm 
screws. If you replace the screw opposite the tab first, the other 
two screws are easier to insert and replace.
 HINT: Be sure to route 
cables so that they will not 
be crimped or pinched 
when the complete 
assembly is put back 
together. 4Replace any subassemblies that you may have removed, including the 
memory modules, PCI card cage, Mini PCI card, speaker modules, 
thermal cooling assembly, and hybrid cooling fan.
5Replace the palm rest assembly, the display assembly, the hard drive, 
and the keyboard assembly.
6Replace the modular bay devices and any PC Cards or plastic blanks in 
the PC Card slot.
 HINT: After replacing 
the system board 
assembly, be sure to enter 
the system’s service tag 
number into the BIOS of 
the replacement system 
board assembly. 7Insert the floppy disk or CD that accompanied the replacement 
system board assembly into the appropriate drive, and turn on the 
computer. Follow the instructions on the display screen. 
						

							148Removing and Replacing Parts
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Module Latch Assemblies
Removing the Module Latch 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 on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
1
Remove the hard drive assembly.
2Turn the computer over and remove the keyboard assembly.
module latches (2)
spring (2) slider (2)
module latch button (2)bottom case assembly location of 
snap tabs (2)
wear rib (2)
bump (2) 
						

							Removing and Replacing Parts149
3Remove the display assembly.
4Remove the palm rest assembly.
5Remove the left module latch button from the bottom case assembly 
by squeezing the snap tabs.
Apply pressure to the module latch and spring while unsnapping the 
snap tabs to prevent the module latch assembly from coming loose 
from the case. If the module latch assembly does come loose from the 
case:
aReinsert the spring onto the slider on the module latch, and 
reinstall the module latch into the holding features on the inside 
of the case.
 HINT: The latch will not 
function properly if the 
slider is oriented 
incorrectly.bEnsure that the slider is inserted in its respective hole, that the 
side of the latch with the two bumps is facing the back of the case, 
and that the surface with the wear ribs is facing the bottom of the 
case.
6Snap in the new latch button from the bottom of the base, making 
certain its snap tabs are fully engaged in the module latch.
7Ensure that the newly installed latch moves smoothly and freely when 
pushed and released.
8Repeat steps 5 through 7 for the latch on the right side. 
						

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