Dell P74F002 User manual

Dell Precision 7540
Service Manual
Regulatory Model: P74F
Regulatory Type: P74F002
November 2022
Rev. A04

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid
the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2019-2022 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its
subsidiaries. Other trademarks may be trademarks of their respective owners.

Chapter 1: Working on your computer............................................................................................7
Safety instructions.............................................................................................................................................................. 7
Turning off your computer — Windows 10................................................................................................................... 7
Before working inside your computer.............................................................................................................................8
After working inside your computer................................................................................................................................8
Chapter 2: Technology and components........................................................................................ 9
HDMI 2.0................................................................................................................................................................................9
USB features.......................................................................................................................................................................10
USB Type-C......................................................................................................................................................................... 11
Chapter 3: Removing and installing components.......................................................................... 14
Recommended tools..........................................................................................................................................................14
Screw size list..................................................................................................................................................................... 15
SD card.................................................................................................................................................................................16
Removing SD card....................................................................................................................................................... 16
Installing SD card..........................................................................................................................................................16
Base cover........................................................................................................................................................................... 17
Removing the base cover...........................................................................................................................................17
Installing the base cover.............................................................................................................................................18
Battery..................................................................................................................................................................................19
Lithium-ion battery precautions............................................................................................................................... 19
Removing the battery.................................................................................................................................................20
Installing the battery....................................................................................................................................................21
Keyboard..............................................................................................................................................................................23
Removing the keyboard............................................................................................................................................. 23
Installing the keyboard............................................................................................................................................... 26
Primary memory module.................................................................................................................................................. 29
Removing the primary memory module................................................................................................................. 29
Installing the primary memory module....................................................................................................................30
Secondary memory module.............................................................................................................................................30
Removing the secondary memory module............................................................................................................ 30
Installing the secondary memory module............................................................................................................... 31
WWAN card........................................................................................................................................................................ 32
Removing WWAN card...............................................................................................................................................32
Installing the WWAN card......................................................................................................................................... 33
WLAN card..........................................................................................................................................................................34
Removing the WLAN card.........................................................................................................................................34
Installing the WLAN card...........................................................................................................................................35
SIM card.............................................................................................................................................................................. 36
Removing SIM card.....................................................................................................................................................36
Installing SIM card....................................................................................................................................................... 37
Solid State Drive................................................................................................................................................................38
Removing the M.2 Solid State Drive—SSD module........................................................................................... 38
Contents
Contents 3

Installing the M.2 SSD module................................................................................................................................. 40
2.5" Hard drive...................................................................................................................................................................42
Removing the hard drive assembly......................................................................................................................... 42
Installing the hard drive assembly........................................................................................................................... 43
Hard drive interposer board............................................................................................................................................44
Removing the hard drive interposer board............................................................................................................44
Installing the hard drive interposer board..............................................................................................................45
Coin-cell battery................................................................................................................................................................ 46
Removing the coin cell battery................................................................................................................................ 46
Installing the coin cell battery...................................................................................................................................47
Power connector port......................................................................................................................................................48
Removing the power connector port..................................................................................................................... 48
Installing the power connector port....................................................................................................................... 50
Power daughter-board.....................................................................................................................................................52
Removing the power daughter-board.................................................................................................................... 52
Installing the power daughter-board ..................................................................................................................... 54
Palm rest............................................................................................................................................................................. 56
Removing the palmrest..............................................................................................................................................56
Installing the palmrest................................................................................................................................................ 59
Touchpad button................................................................................................................................................................61
Removing the Touchpad buttons.............................................................................................................................61
Installing the Touchpad button................................................................................................................................ 62
Smart card cage................................................................................................................................................................ 62
Removing the smart card cage................................................................................................................................ 62
Installing the smart card cage.................................................................................................................................. 63
Speaker................................................................................................................................................................................64
Removing the speakers ........................................................................................................................................ 64
Installing the speakers................................................................................................................................................65
LED board........................................................................................................................................................................... 66
Removing the LED board...........................................................................................................................................66
Installing the LED board............................................................................................................................................. 67
Heat sink ............................................................................................................................................................................ 68
Removing the heat sink assembly........................................................................................................................... 68
Installing the heat sink assembly.............................................................................................................................. 71
Graphics card..................................................................................................................................................................... 73
Removing the graphics card..................................................................................................................................... 73
Installing the graphics card....................................................................................................................................... 74
System board..................................................................................................................................................................... 75
Removing the system board..................................................................................................................................... 75
Installing the system board....................................................................................................................................... 78
Display assembly.................................................................................................................................................................81
Removing the display assembly................................................................................................................................ 81
Installing the display assembly..................................................................................................................................84
Display bezel....................................................................................................................................................................... 87
Removing the display bezel.......................................................................................................................................87
Installing the display bezel.........................................................................................................................................88
Display panel.......................................................................................................................................................................89
Removing the display panel...................................................................................................................................... 89
Installing the display panel.........................................................................................................................................90
Display hinges..................................................................................................................................................................... 91
4Contents

Removing the display hinge....................................................................................................................................... 91
Installing the display hinge........................................................................................................................................ 92
Camera.................................................................................................................................................................................93
Removing the camera.................................................................................................................................................93
Installing the camera...................................................................................................................................................94
eDP cable............................................................................................................................................................................ 95
Removing the eDP cable........................................................................................................................................... 95
Installing the eDP cable..............................................................................................................................................96
Display bracket...................................................................................................................................................................97
Removing the display support bracket...................................................................................................................97
Installing the display support bracket.....................................................................................................................98
Chapter 4: BIOS setup............................................................................................................... 100
BIOS overview..................................................................................................................................................................100
Entering BIOS setup program.......................................................................................................................................100
Navigation keys................................................................................................................................................................100
One time boot menu........................................................................................................................................................ 101
System setup options......................................................................................................................................................101
General options........................................................................................................................................................... 101
System configuration................................................................................................................................................102
Video screen options.................................................................................................................................................104
Security........................................................................................................................................................................ 105
Secure Boot................................................................................................................................................................ 106
Intel Software Guard Extensions options.............................................................................................................107
Performance................................................................................................................................................................107
Power management.................................................................................................................................................. 108
Post behavior..............................................................................................................................................................109
Virtualization support................................................................................................................................................ 110
Wireless options..........................................................................................................................................................110
Maintenance................................................................................................................................................................. 111
System logs...................................................................................................................................................................111
Updating the BIOS............................................................................................................................................................ 111
Updating the BIOS in Windows................................................................................................................................111
Updating the BIOS in Linux and Ubuntu............................................................................................................... 112
Updating the BIOS using the USB drive in Windows.........................................................................................112
Updating the BIOS from the F12 One-Time boot menu....................................................................................112
System and setup password..........................................................................................................................................113
Assigning a system setup password...................................................................................................................... 113
Deleting or changing an existing system setup password................................................................................ 114
Clearing CMOS settings................................................................................................................................................. 114
Clearing BIOS (System Setup) and System passwords..........................................................................................114
Chapter 5: Troubleshooting........................................................................................................115
Handling swollen Lithium-ion batteries....................................................................................................................... 115
Enhanced Pre-Boot System Assessment — ePSA diagnostics............................................................................116
Running the ePSA Diagnostics................................................................................................................................116
Built-in self-test (BIST).................................................................................................................................................. 116
M-BIST.......................................................................................................................................................................... 116
LCD Power rail test (L-BIST).................................................................................................................................. 117
Contents 5

LCD Built-in Self Test (BIST)...................................................................................................................................117
Diagnostic LED..................................................................................................................................................................118
Recovering the operating system.................................................................................................................................118
Real-Time Clock (RTC Reset).......................................................................................................................................119
Battery status LED...........................................................................................................................................................119
Backup media and recovery options............................................................................................................................ 119
WiFi power cycle.............................................................................................................................................................. 119
Drain residual flea power (perform hard reset)........................................................................................................120
Chapter 6: Getting help.............................................................................................................. 121
Contacting Dell..................................................................................................................................................................121
6 Contents

Working on your computer
Topics:
•Safety instructions
•Turning off your computer — Windows 10
•Before working inside your computer
•After working inside your computer
Safety instructions
Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless
otherwise noted, each procedure included in this document assumes that the following conditions exist:
●You have read the safety information that shipped with your computer.
●A component can be replaced or, if purchased separately, installed by performing the removal procedure in reverse order.
WARNING: Before working inside your computer, read the safety information that shipped with your computer.
For additional safety best practices information, see the Regulatory Compliance Homepage
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically
touching an unpainted metal surface at the same time as touching a connector on the back of the computer.
CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a
card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by
its pins.
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some
cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking
tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending
any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and
aligned.
NOTE: Disconnect all power sources before opening the computer cover or panels. After you finish working inside the
computer, replace all covers, panels, and screws before connecting to the power source.
CAUTION: Exercise caution when handling Lithium-ion batteries in laptops. Swollen batteries should not be used
and should be replaced and disposed properly.
NOTE: The color of your computer and certain components may appear differently than shown in this document.
Turning off your computer — Windows 10
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your
computer or remove the side cover.
1. Click or tap .
1
Working on your computer 7

2. Click or tap and then click or tap Shut down.
NOTE: Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not
automatically turn off when you shut down your operating system, press and hold the power button for about 6 seconds
to turn them off.
Before working inside your computer
1. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
2. Turn off your computer.
3. Disconnect all network cables from the computer (if available).
CAUTION: If your computer has an RJ45 port, disconnect the network cable by first unplugging the cable
from your computer.
4. Disconnect your computer and all attached devices from their electrical outlets.
5. Open the display.
6. Press and hold the power button for few seconds, to ground the system board.
CAUTION: To guard against electrical shock unplug your computer from the electrical outlet before
performing Step # 8.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by
periodically touching an unpainted metal surface at the same time as touching a connector on the back
of the computer.
7. Remove any installed ExpressCards or Smart Cards from the appropriate slots.
After working inside your computer
After you complete any replacement procedure, ensure that you connect external devices, cards, and cables before turning on
your computer.
CAUTION: To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do
not use batteries designed for other Dell computers.
1. Connect any external devices, such as a port replicator or media base, and replace any cards, such as an ExpressCard.
2. Connect any telephone or network cables to your computer.
CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into the
computer.
3. Connect your computer and all attached devices to their electrical outlets.
4. Turn on your computer.
8Working on your computer

Technology and components
This chapter details the technology and components available in the system.
Topics:
•HDMI 2.0
•USB features
•USB Type-C
HDMI 2.0
This topic explains the HDMI 2.0 and its features along with the advantages.
HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI
provides an interface between any compatible digital audio/video source, such as a DVD player, or A/V receiver and a
compatible digital audio and/or video monitor, such as a digital TV (DTV). The intended applications for HDMI TVs, and DVD
players. The primary advantage is cable reduction and content protection provisions. HDMI supports standard, enhanced, or
high-definition video, plus multichannel digital audio on a single cable.
HDMI 2.0 Features
●HDMI Ethernet Channel - Adds high-speed networking to an HDMI link, allowing users to take full advantage of their
IP-enabled devices without a separate Ethernet cable
●Audio Return Channel - Allows an HDMI-connected TV with a built-in tuner to send audio data "upstream" to a surround
audio system, eliminating the need for a separate audio cable
●3D - Defines input/output protocols for major 3D video formats, paving the way for true 3D gaming and 3D home theater
applications
●Content Type - Real-time signaling of content types between display and source devices, enabling a TV to optimize picture
settings based on content type
●Additional Color Spaces - Adds support for additional color models used in digital photography and computer graphics
●4K Support - Enables video resolutions far beyond 1080p, supporting next-generation displays that will rival the Digital
Cinema systems used in many commercial movie theaters
●HDMI Micro Connector - A new, smaller connector for phones and other portable devices, supporting video resolutions up
to 1080p
●Automotive Connection System - New cables and connectors for automotive video systems, designed to meet the unique
demands of the motoring environment while delivering true HD quality
Advantages of HDMI
●Quality HDMI transfers uncompressed digital audio and video for the highest, crispest image quality.
●Low -cost HDMI provides the quality and functionality of a digital interface while also supporting uncompressed video
formats in a simple, cost-effective manner
●Audio HDMI supports multiple audio formats from standard stereo to multichannel surround sound
●HDMI combines video and multichannel audio into a single cable, eliminating the cost, complexity, and confusion of multiple
cables currently used in A/V systems
●HDMI supports communication between the video source (such as a DVD player) and the DTV, enabling new functionality
2
Technology and components 9

USB features
Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and
peripheral devices like mice, keyboards, external drivers, and printers.
Table 1. USB evolution
Type Data Transfer Rate Category Introduction Year
USB 2.0 480 Mbps High Speed 2000
USB 3.0/USB 3.1 Gen
1
5 Gbps SuperSpeed 2010
USB 3.1 Gen 2 10 Gbps SuperSpeed 2013
USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB)
For years, the USB 2.0 has been firmly entrenched as the de facto interface standard in the PC world with about 6 billion
devices sold, and yet the need for more speed grows by ever faster computing hardware and ever greater bandwidth demands.
The USB 3.0/USB 3.1 Gen 1 finally has the answer to the consumers' demands with a theoretically 10 times faster than its
predecessor. In a nutshell, USB 3.1 Gen 1 features are as follows:
●Higher transfer rates (up to 5 Gbps)
●Increased maximum bus power and increased device current draw to better accommodate power-hungry devices
●New power management features
●Full-duplex data transfers and support for new transfer types
●Backward USB 2.0 compatibility
●New connectors and cable
The topics below cover some of the most commonly asked questions regarding USB 3.0/USB 3.1 Gen 1.
Speed
Currently, there are 3 speed modes defined by the latest USB 3.0/USB 3.1 Gen 1 specification. They are Super-Speed, Hi-Speed
and Full-Speed. The new SuperSpeed mode has a transfer rate of 4.8 Gbps. While the specification retains Hi-Speed, and
Full-Speed USB mode, commonly known as USB 2.0 and 1.1 respectively, the slower modes still operate at 480 Mbps and 12
Mbps respectively and are kept to maintain backward compatibility.
USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below:
●An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below).
●USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more
for two pairs of differential signals (receive and transmit) for a combined total of eight connections in the connectors and
cabling.
●USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a
10-fold increase in theoretical bandwidth.
10 Technology and components

With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices,
high megapixel count digital cameras etc., USB 2.0 may not be fast enough. Furthermore, no USB 2.0 connection could ever
come close to the 480Mbps theoretical maximum throughput, making data transfer at around 320 Mbps (40 MB/s) — the
actual real-world maximum. Similarly, USB 3.0/USB 3.1 Gen 1 connections will never achieve 4.8Gbps. We will likely see a
real-world maximum rate of 400MB/s with overheads. At this speed, USB 3.0/USB 3.1 Gen 1 is a 10x improvement over USB
2.0.
Applications
USB 3.0/USB 3.1 Gen 1 opens up the laneways and provides more headroom for devices to deliver a better overall
experience. Where USB video was barely tolerable previously (both from a maximum resolution, latency, and video compression
perspective), it's easy to imagine that with 5-10 times the bandwidth available, USB video solutions should work that much
better. Single-link DVI requires almost 2Gbps throughput. Where 480Mbps was limiting, 5Gbps is more than promising. With its
promised 4.8Gbps speed, the standard will find its way into some products that previously weren't USB territory, like external
RAID storage systems.
Listed below are some of the available SuperSpeed USB 3.0/USB 3.1 Gen 1 products:
●External Desktop USB 3.0/USB 3.1 Gen 1 Hard Drives
●Portable USB 3.0/USB 3.1 Gen 1 Hard Drives
●USB 3.0/USB 3.1 Gen 1 Drive Docks & Adapters
●USB 3.0/USB 3.1 Gen 1 Flash Drives & Readers
●USB 3.0/USB 3.1 Gen 1 Solid-state Drives
●USB 3.0/USB 3.1 Gen 1 RAIDs
●Optical Media Drives
●Multimedia Devices
●Networking
●USB 3.0/USB 3.1 Gen 1 Adapter Cards & Hubs
Compatibility
The good news is that USB 3.0/USB 3.1 Gen 1 has been carefully planned from the start to peacefully co-exist with USB 2.0.
First of all, while USB 3.0/USB 3.1 Gen 1 specifies new physical connections and thus new cables to take advantage of the
higher speed capability of the new protocol, the connector itself remains the same rectangular shape with the four USB 2.0
contacts in the exact same location as before. Five new connections to carry receive and transmitted data independently are
present on USB 3.0/USB 3.1 Gen 1 cables and only come into contact when connected to a proper SuperSpeed USB connection.
USB Type-C
USB Type-C is a new, tiny physical connector. The connector itself can support various exciting new USB standards like USB 3.1
and USB power delivery (USB PD).
Technology and components 11

Alternate Mode
USB Type-C is a new connector standard that is very small. It is about a third the size of an old USB Type-A plug. This is
a single connector standard that every device should be able to use. USB Type-C ports can support a variety of different
protocols using “alternate modes,” which allows you to have adapters that can output HDMI, VGA, DisplayPort, or other types
of connections from that single USB port
USB Power Delivery
The USB PD specification is also closely intertwined with USB Type-C. Currently, smartphones, tablets, and other mobile
devices often use a USB connection to charge. A USB 2.0 connection provides up to 2.5 watts of power — that'll charge your
phone, but that's about it. A laptop might require up to 60 watts, for example. The USB Power Delivery specification ups this
power delivery to 100 watts. It's bi-directional, so a device can either send or receive power. And this power can be transferred
at the same time the device is transmitting data across the connection.
This could spell the end of all those proprietary laptop charging cables, with everything charging via a standard USB connection.
You could charge your laptop from one of those portable battery packs you charge your smartphones and other portable devices
from today. You could plug your laptop into an external display connected to a power cable, and that external display would
charge your laptop as you used it as an external display — all via the one little USB Type-C connection. To use this, the device
and the cable have to support USB Power Delivery. Just having a USB Type-C connection doesn't necessarily mean they do.
USB Type-C and USB 3.1
USB 3.1 is a new USB standard. USB 3's theoretical bandwidth is 5 Gbps, while USB 3.1's is 10 Gbps. That's double the
bandwidth, as fast as a first-generation Thunderbolt connector. USB Type-C isn't the same thing as USB 3.1. USB Type-C is just
a connector shape, and the underlying technology could just be USB 2 or USB 3.0. In fact, Nokia's N1 Android tablet uses a USB
Type-C connector, but underneath it's all USB 2.0 — not even USB 3.0. However, these technologies are closely related.
Thunderbolt over USB Type-C
Thunderbolt is a hardware interface that combines data, video, audio, and power in a single connection. Thunderbolt combines
PCI Express (PCIe) and DisplayPort (DP) into one serial signal, and additionally provides DC power, all in one cable. Thunderbolt
1 and Thunderbolt 2 use the same connector as miniDP (DisplayPort) to connect to peripherals, while Thunderbolt 3 uses a USB
Type-C connector.
Figure 1. Thunderbolt 1 and Thunderbolt 3
1. Thunderbolt 1 and Thunderbolt 2 (using a miniDP connector)
2. Thunderbolt 3 (using a USB Type-C connector)
Thunderbolt 3 over USB Type-C
Thunderbolt 3 brings Thunderbolt to USB Type-C at speeds up to 40 Gbps, creating one compact port that does it all -
delivering the fastest, most versatile connection to any dock, display or data device like an external hard drive. Thunderbolt 3
uses a USB Type-C connector/port to connect to supported peripherals.
1. Thunderbolt 3 uses USB Type-C connector and cables - It is compact and reversible
12 Technology and components

2. Thunderbolt 3 supports speed up to 40 Gbps
3. DisplayPort 1.4 – compatible with existing DisplayPort monitors, devices and cables
4. USB Power Delivery - Up to 130W on supported computers
Key Features of Thunderbolt 3 over USB Type-C
1. Thunderbolt, USB, DisplayPort and power on USB Type-C on a single cable (features vary between different products)
2. USB Type-C connector and cables which are compact and reversible
3. Supports Thunderbolt Networking (*varies between different products)
4. Supports up to 4K displays
5. Up to 40 Gbps
NOTE: Data transfer speed may vary between different devices.
Thunderbolt Icons
Figure 2. Thunderbolt Iconography Variations
Technology and components 13

Removing and installing components
NOTE: The images in this document may differ from your computer depending on the configuration you ordered.
Topics:
•Recommended tools
•Screw size list
•SD card
•Base cover
•Battery
•Keyboard
•Primary memory module
•Secondary memory module
•WWAN card
•WLAN card
•SIM card
•Solid State Drive
•2.5" Hard drive
•Hard drive interposer board
•Coin-cell battery
•Power connector port
•Power daughter-board
•Palm rest
•Touchpad button
•Smart card cage
•Speaker
•LED board
•Heat sink
•Graphics card
•System board
•Display assembly
•Display bezel
•Display panel
•Display hinges
•Camera
•eDP cable
•Display bracket
Recommended tools
The procedures in this document require the following tools:
●Phillips #0 screwdriver
●Phillips #1 screwdriver
●Plastic scribe
NOTE: The #0 screw driver is for screws 0-1 and the #1 screw driver is for screws 2-4
3
14 Removing and installing components

Screw size list
Table 2. Precision 7540
Component Screw type Quantity Image
Keyboard M2.0x2.0 6
SSD thermal plate
M.2 SSD card
HDD Interposer board
WLAN card
WWAN
eDP bracket
Display panel
Power button board
Smart card cage
FPC beam connector
Palmrest
Display support bracket
Power daughter-board
M2.0x3.0 1 per SSD
1 per SSD
2
1
1
2
4
1
2
2
4
6
3
System board
Palmrest
Type-C bracket
LED board
Power connector port
GPU card
M2.0x5.0 3
11
3
1
1
2
4 Cell Battery
6 Cell Battery
HDD assembly
M2.5x3.0 2
3
4
Display hinge M2.5x3.5 6
Hinge cap
Display assembly (bottom)
M2.5x4.0 4
2
Display assembly (rear) M2.5X6.0 2
HDD bracket M3.0x3.0 4
Removing and installing components 15

SD card
Removing SD card
1. Follow the procedure in Before working inside your computer.
2. Press the SD card in to release it from the system.
3. Slide the SD card out of the system.
Installing SD card
1. Slide the SD card into its slot until it clicks into place.
16 Removing and installing components

2. Follow the procedure in After working inside your computer.
Base cover
Removing the base cover
1. Follow the procedure in Before working inside your computer.
2. Remove the SD card.
3. To remove the base cover:
a. Loosen the 7 captive screws that secure the base cover to the system [1].
b. Pry open the base cover starting from the two recess point at the top edge of the system [2].
c. Pry around all the edges of the base cover [3].
d. Remove the base cover from the system [4].
Removing and installing components 17

NOTE: While pry open the base cover make sure to use hands or plastic scribe—do not use any other sharp objects
as it may damage the chassis
Installing the base cover
1. To install the base cover:
a. Slide the base cover into its slot until it clicks into place [1, 2].
b. Tighten the captive screws to secure the base cover to the system [3].
18 Removing and installing components

2. Install the SD card.
3. Follow the procedure in After working inside your computer.
Battery
Lithium-ion battery precautions
CAUTION:
●Exercise caution when handling Lithium-ion batteries.
●Discharge the battery as much as possible before removing it from the system. This can be done by
disconnecting the AC adapter from the system to allow the battery to drain.
●Do not crush, drop, mutilate, or penetrate the battery with foreign objects.
●Do not expose the battery to high temperatures, or disassemble battery packs and cells.
●Do not apply pressure to the surface of the battery.
●Do not bend the battery.
●Do not use tools of any kind to pry on or against the battery.
●Ensure any screws during the servicing of this product are not lost or misplaced, to prevent accidental
puncture or damage to the battery and other system components.
●If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing,
bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical
support for assistance. See www.dell.com/contactdell.
●Always purchase genuine batteries from www.dell.com or authorized Dell partners and resellers.
Removing and installing components 19

Removing the battery
1. Follow the procedure in Before working inside your computer.
2. Remove the:.
a. SD card
b. base cover
3. To remove the 6-cell battery:
a. Disconnect the battery cable from the connector on the battery [1].
b. Remove the 3 (M2.5x3.0) screws that secure the battery to the system [2].
c. Remove the battery away from the system [3].
4. To remove the 4-cell battery:
a. Disconnect the battery cable from the connector on the battery [1].
b. Remove the 2 (M2.5x3.0) screws that secure the battery to the system [2].
c. Remove the battery away from the system [3].
20 Removing and installing components