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OptiPlex 3090 Micro

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Regulatory Model: D14U

Regulatory Type: D14U001

October 2021

Rev. A00

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.

trademarks may be trademarks of their respective owners.

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

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

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

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

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

Major components of your system................................................................................................................................ 12

Side cover............................................................................................................................................................................ 13

Removing the side cover............................................................................................................................................ 13

Installing the side cover.............................................................................................................................................. 15

Front bezel...........................................................................................................................................................................16

Removing the front bezel...........................................................................................................................................16

Installing the front bezel.............................................................................................................................................17

Hard-drive assembly..........................................................................................................................................................18

Removing the hard-drive assembly......................................................................................................................... 18

Removing the hard-drive bracket............................................................................................................................ 19

Installing the hard-drive bracket..............................................................................................................................20

Installing the 2.5 in. hard-drive assembly............................................................................................................... 21

Solid-state drive................................................................................................................................................................ 22

Removing the M.2 2230 PCIe solid-state drive................................................................................................... 22

Installing the M.2 2230 PCIe solid-state drive..................................................................................................... 23

Removing the M.2 2280 PCIe solid-state drive................................................................................................... 24

Installing the M.2 2280 PCIe solid-state drive..................................................................................................... 25

Fan assembly...................................................................................................................................................................... 26

Removing the fan assembly...................................................................................................................................... 26

Installing the fan assembly........................................................................................................................................ 28

WLAN card..........................................................................................................................................................................30

Removing the WLAN card.........................................................................................................................................30

Installing the WLAN card............................................................................................................................................31

Heat sink..............................................................................................................................................................................33

Removing the heat sink..............................................................................................................................................33

Installing the heat sink................................................................................................................................................34

Coin-cell battery................................................................................................................................................................ 35

Removing the coin-cell battery................................................................................................................................35

Installing the coin-cell battery.................................................................................................................................. 35

Memory modules............................................................................................................................................................... 36

Removing the memory modules...............................................................................................................................36

Installing the memory modules................................................................................................................................. 37

Speaker................................................................................................................................................................................ 38

Contents

Contents 3