Lenovo 4228, 4223, 4229 manual Removing the computer cover

Models: 4229 4223 4228

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required connector. Then, use the instructions that come with the option to help you make the connection and install any software or device drivers that are required for the option.

Removing the computer cover

Attention: Do not open your computer or attempt any repair before reading and understanding the “Important Safety Information” on page 1.

This section provides instructions on how to remove the computer cover.

CAUTION:

Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover.

To remove the computer cover, do the following:

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

2.Disconnect all power cords from electrical outlets.

3.Disconnect the power cords, Input/Output cables, and any other cables that are connected to the computer. See “Locating connectors, controls, and indicators on the front of your computer” on page 55 and “Locating connectors on the rear of your computer” on page 56.

4.Remove any locking device that secures the computer cover, such as a padlock or an integrated cable lock.

64ThinkStation Hardware Maintenance Manual

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Lenovo 4228, 4223, 4229 manual Removing the computer cover