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Chapter 1: Working inside your computer...................................................................................... 6

Safety instructions.............................................................................................................................................................. 6

Before working inside your computer.......................................................................................................................6

Safety precautions.........................................................................................................................................................7

Electrostatic discharge—ESD protection................................................................................................................7

ESD field service kit ..................................................................................................................................................... 8

Transporting sensitive components.......................................................................................................................... 9

After working inside your computer..........................................................................................................................9

BitLocker..........................................................................................................................................................................9

Chapter 2: Removing and installing components.......................................................................... 10

Recommended tools..........................................................................................................................................................10

Screw list............................................................................................................................................................................. 10

Major components of Vostro 3520................................................................................................................................ 11

Secure Digital (SD) Card..................................................................................................................................................13

Removing the Secure Digital card............................................................................................................................13

Installing the Secure Digital card..............................................................................................................................15

Base cover........................................................................................................................................................................... 16

Removing the base cover...........................................................................................................................................16

Installing the base cover............................................................................................................................................ 20

Battery................................................................................................................................................................................. 23

Lithium-ion battery precautions...............................................................................................................................23

Removing the 3-cell battery..................................................................................................................................... 24

Installing the 3-cell battery....................................................................................................................................... 25

Removing the 4-cell battery..................................................................................................................................... 26

Installing the 4-cell battery....................................................................................................................................... 28

Disconnecting the battery cable..............................................................................................................................29

Connecting the battery cable...................................................................................................................................30

M.2 solid-state drive......................................................................................................................................................... 31

Removing the M.2 2230 solid state drive.............................................................................................................. 31

Installing the M.2 2230 solid state drive................................................................................................................32

Removing the M.2 2280 solid state drive..............................................................................................................33

Installing the M.2 2280 solid state drive................................................................................................................34

Wireless card...................................................................................................................................................................... 35

Removing the wireless card......................................................................................................................................35

Installing the wireless card........................................................................................................................................ 36

I/O board.............................................................................................................................................................................38

Removing the Input/Output board......................................................................................................................... 38

Installing the Input/Output board........................................................................................................................... 39

I/O daughter board FFC..................................................................................................................................................40

Removing the Input/Output daughterboard FFC................................................................................................40

Installing the Input/Output daughter board FFC................................................................................................. 41

Hard drive assembly..........................................................................................................................................................43

Removing the hard drive .......................................................................................................................................... 43

Contents

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