Precision 3660 Tower Service Manual

The following image indicates the connectors on your system board.

1. Intrusion switch connector
2. CPU
3. ATX CPU power connector : 1 and 2
4. Memory module slots
5. SATA power connector
6. M2 SSD slot
7. Coin cell battery
8. System fan connector 1
9. Power remote connector
10. Power switch connector
11. Intrusion speaker connector
12. WLAN slot
13. System fan connector 2
14. Internal USB connector
15. SATA 4 connector
16. SATA 3 connector
17. SATA 2 connector
18. SATA 1 connector
19. SATA 0 connector
20. ATX system power connector
21. M.2 PCIe SSD slot
22. Thunderbolt connector
23. PCIe x4 connector
24. PCIe x16 connector
25. M.2 PCIe SSD slot
26. PCIe x4 connector
27. System fan connector
28. CPU fan connector
29. Type-C connector
30. Liquid cooler connector
31. Video card connector
32. LAN connector

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

1. Install the processor.
2. Install the liquid cooler.
3. Install the chassis fan.
4. Install the 125 W heat-sink assembly or 65 W heat-sink assembly.
5. Install the coin-cell battery.
6. Install the intrusion switch.
7. Install the internal speaker.
8. Install the powered GPU.
   NOTE:This step is required only if the system is configured with powered GPU.
9. Install the graphics card.
10. Install the M.2 2230 SSD/M.2 2280 SSD.
11. Install the WLAN.
12. Install the memory module.
13. Install the fan duct
14. Install the front bezel.
15. Install the side cover.
16. Follow the procedure in after working inside your computer.
    NOTE:Your computer’s Service Tag 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.