Lenovo S40-40 All-in-One - Manual (Page 55)

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User Guide
6. Disconnect the cables from the hard disk drive.
7. Push the lock pins outward to release the hard disk drive from the bracket.
Note: Do not touch the circuit board on the bottom of the hard disk
drive.
8. Line up the new hard disk drive with the bracket, then insert the new hard disk
drive into position and secure it with the pins.
9. Connect the cables to the new hard disk drive.
10. Line up the locating pins on the hard disk drive assembly with the mounting
holes on the chassis, then attach the hard disk drive assembly to the chassis.
11. Reattach the computer cover and the computer stand.