Removal steps of the I/O bracket Step Screw (quantity) Color Torque 1 M2 × 4 mm, flat head, nylon-coated (3) Black 0.181 Nm (1.85 kgf-cm) Removal steps of the RJ45 bracket Step Screw (quantity) Color Torque 1 M2 × 3.5 mm, flat head, nylon-coated (3) Sliver 0.181 Nm (1.85 kgf-cm) 1150 Thermal fan assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 • “1030 Base cover assembly” on page 65 Removal steps of the thermal fan assembly Notes: • Loosen the screws in ascending alphabetical order as illustrated. 82 T480 Hardware Maintenance Manual