For access, remove:
- Battery pack
- Thermal door
- Fan assembly
- Heat sink assembly
Attention: CPU is extremely sensitive. When you service the CPU, avoid any kind of rough handling.
Removal steps of CPU
Rotate the head of the screw in the direction shown by arrow  to release the lock; then remove the CPU.
When installing: Place the CPU on the CPU socket [a], and then rotate the head of the screw in the direction shown by arrow [b] to secure the CPU.