Lenovo Computer ThinkCentre M900 10JN

Read and understand the 'Read this first: Important safety information' on page iii.

Refer to the 'Lithium coin-cell battery notice' in the Safety and Warranty Guide.

Remove any media from the drives.

Turn off all connected devices and the computer.

Disconnect all power cords from electrical outlets.

Disconnect all cables connected to the computer.

Pre-replacement Safety Measures

Read and understand the 'Read this first: Important safety information' on page iii.

Remove all media from the drives and turn off all attached devices and the computer.

Disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

Disconnect the external battery box cable from the USB connector on the computer.

Remove the screw that secures the external battery box on the VESA mount bracket.

Slide the external battery box to remove it from the VESA mount bracket.

Pre-replacement Safety Measures

Read and understand the 'Read this first: Important safety information' on page iii.

Remove any media from the drives and turn off all connected devices and the computer.

Disconnect all power cords from electrical outlets and disconnect all cables connected to the computer.

Replacing the 2.5-inch Storage Drive

Remove the computer cover. See 'Removing the computer cover' on page 77.

Locate the 2.5-inch storage drive. See 'Computer components' on page 5.

Is there a front Wi-Fi antenna installed?

Disconnect the front Wi-Fi antenna cable from the Wi-Fi card if applicable.

Remove media and turn off devices

Disconnect power cords and cables

Disconnect the internal speaker cable from the system board

Release the tabs securing the internal speaker and remove it

Insert the new internal speaker and secure it with tabs

Secure the cable of the new internal speaker in the retaining clip

Read and understand the 'Read this first: Important safety information' on page iii

Remove any media from the drives and turn off all connected devices and the computer

Disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer

Remove the storage drive bracket

Disconnect the Wi-Fi antenna cables from the Wi-Fi card

Remove the screw that secures the Wi-Fi card

Pull the Wi-Fi card out of the M.2 Wi-Fi card slot