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OptiPlex Tower Plus 7020 Owner's Manual

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Installing the system board

CAUTION:The information in this installation section is intended for authorized service technicians only.

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

About this task

NOTE:The Service Tag of your computer is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board.
NOTE:Replacing the system board removes any changes that you have made to the BIOS using the BIOS setup program. You must make the appropriate changes again after you replace the system board.

The following image indicates the connectors on your system board.

Figure 1. System board connectors
System board connectors of OptiPlex Tower Plus 7020
  1. Power-supply unit cable connector (ATX CPU1)
  2. Power-supply unit cable connector (ATX CPU2)
  3. Memory module connectors (DIMM3, DIMM1, DIMM4, DIMM2)
  4. Power-button cable connector (PWR SW)
  5. Media-card reader connector (SD CARD)
  6. M.2 2230/2280 solid-state drive connector (M.2 PCIe SSD-1)
  7. M.2 2230 solid-state drive connector (M.2 PCIe SSD-2)
  8. Hard-drive data cable connector (SATA0)
  9. Hard drive/Slim optical drive power cable connector (SATA1 and SATA2)
  10. Slim optical drive data cable connector (SATA3)
  11. SATA power cable connector (SATA PWR)
  12. Wireless card connector (M.2 WLAN)
  13. Power-supply unit cable connector (ATX SYS)
  14. Internal-speaker cable connector (INT SPKR)
  15. Coin-cell battery connector (RTC)
  16. Thunderbolt card connector (TBT)
  17. PCIe x4 card connector (SLOT4)
  18. PCI card connector (SLOT3)
  19. PCIe x16 card connector (SLOT2)
  20. PCIe x1 card connector (SLOT1)
  21. System-fan cable connector (FAN SYS)
  22. Intrusion-switch cable connector (INTRUSION)
  23. USB Type-C port connector (TYPE-C)
  24. M.2 2230/2280 solid-state drive connector (M.2 PCIe SSD-0)
  25. Processor socket (CPU)
  26. Optional video port connector (VIDEO)
  27. Optional serial port connector (KB MS SERIAL)

The following images indicate the location of the system board and provide a visual representation of the installation procedure.

Figure 2. Installing the system board
Image of installing the system board

Steps

  1. Slide the front I/O-ports on the system board into the front I/O-slots on the chassis and align the screw holes on the system board with the screw holes on the chassis.
  2. Replace the two M.2 solid-state drive standoff nuts (M2) to secure the system board to the chassis.
  3. Replace the seven screws (#6-32) to secure the system board to the chassis.
    Figure 3. Installing the system board
    Image of replacing the screws to secure the system board
  4. Connect the following cables to the respective connectors on the system board and route them through the retention clips on the chassis, if applicable:
    1. Power-supply unit cables (ATX CPU1, ATX CPU2 and ATX SYS)
    2. Slim optical drive cable (SATA3)
    3. Hard drive cables (SATA0 and SATA PWR)
    4. Internal-speaker cable (INT SPKR)
    5. Intrusion-switch cable (INTRUSION)
    Figure 4. Installing the system board
    Image of connecting the cables to the system board
  5. Close the PCIe door and press it gently until it clicks in place on the chassis.
  6. Align the tabs on the front I/O-bracket with the slots on the chassis.
  7. Replace the screw (#6-32) to secure the front I/O-bracket to the chassis.
    Figure 5. Installing the system board
    Image of installing the I/O bracket

Next steps

  1. Install the optional I/O modules, if applicable.
  2. Install the voltage-regulator heat sink.
  3. Install the processor.
  4. Install the system fan.
  5. Install the processor fan and heat-sink assembly (for 65 W processors) or the processor fan and heat-sink assembly (for 125 W processors), whichever is applicable.
  6. Install the external SMA antenna module, if applicable.
  7. Install the power button.
  8. Install the expansion card, if applicable.
  9. Install the 3.5-inch hard drive or the secondary 3.5-inch hard drive, whichever is applicable.
  10. Install the media-card reader, if applicable.
  11. Install the graphics card or the powered graphics card, whichever is applicable.
  12. Install the wireless card.
  13. Install the external puck antenna, if applicable.
  14. Install the M.2 2230 solid-state drive or the M.2 2280 solid-state drive, whichever is applicable.
  15. Install the memory module.
  16. Install the front bezel.
  17. Install the side cover.
  18. Follow the procedure in After working inside your computer.

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