Dell OptiPlex 7070 Small Form Factor Service Manual

Installing the system board

1. Hold the system board by its edges, and align it towards the back of the system.
2. Lower the system board into the system chassis until the connectors at the back of the system board align with the slots on the chassis, and the screw holes on the system board align with the standoffs on the system chassis [1,2].
   
3. Replace the single screw used as a mounting point for M.2 SSD drive, the standoff single (#6-32) screw and the 5 screws that secure the system board to the system [1, 2, 3].
   
4. Route all the cables through the routing clips [1].
5. Align the cables with the pins on connectors on the system board and connect the following cables to the system board:
   1. Power switch [2]
   2. CPU power [3]
   3. Intrusion switch [4]
      
6. Connect the power cable, optical drive data cable and hard drive data cable [1, 2, 3].
7. Insert the hook on the I/O panel into the slot on the chassis and rotate to close the I/O panel [4].
8. Replace the screw to secure the I/O panel to the chassis [5].
   
9. Connect the following cables:
   1. Intrusion switch
   2. Power switch
10. Install the:
    1. M.2 PCIe SSD
    2. Memory module
    3. Processor
    4. Heatsink assembly
    5. Hard drive and optical drive module
    6. HDD assembly
    7. Front bezel
    8. Side cover
11. Follow the procedure in After working inside your computer.