Lenovo 97, 4749 [B545] manual Replacing hardware, General information, Removing the computer cover

6.2 Replacing hardware

Attention: Do not remove the computer cover or attempt any repairs before reading the “Important safety information” in the Safety and Warranty Guide that was included with your computer or in the Hardware Maintenance Manual (HMM) for the computer. To obtain copies of the Safety and Warranty Guide or HMM, go to the Support Web site at: http://consumersupport.lenovo.com

Note: Use only parts provided by Lenovo.

6.2.1 General information

Pre-disassembly instructions

Before proceeding with the disassembly procedure, make sure that you do the following:

1.Turn off the power to the system and all peripherals.

2.Unplug all power and signal cables from the computer.

3.Place the system on a flat, stable surface.

6.2.2 Removing the computer cover

Attention: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.

Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratching or other damage.

To remove the computer cover

1.Remove any media (disks, CDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices.

2.Unplug all power cords from electrical outlets.

3.Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to “Left and right view” and “Rear view” for help with locating the various connectors.

User Guide 49