Lenovo 10121/90A1 [K450 ES] manual Overview, Safety information for replacing CRUs

Overview

This guide is intended to be used by customers who are replacing Customer Replaceable Units (CRUs) as well as trained service personnel who are replacing Field Replaceable Units (FRUs). In this guide, CRUs and FRUs will often be referred to as parts.

Note: Trained service personnel should refer to the Hardware Maintenance Manual (HMM) for parts ordering information.

This guide does not include procedures for the replacement of all parts. It is expected that trained service personnel are already able to replace cables, switches, and certain mechanical parts without the need for step-by-step procedures.

Note: Use only parts provided by Lenovo®.

The description of the TV-Tuner card in this manual applies only to computer models with a TV-Tuner card, and therefore does not apply to models without a TV-Tuner card.

This guide contains instructions for replacing the following parts:

•Memory modules

•Hard disk drive

•Optical disk drive

•Graphics card

•TV-Tuner card

Safety information for replacing CRUs

Do not open your computer or attempt any repairs before reading the “Important safety information” in the Safety and Warranty Guide that was included with your computer. An electronic copy of the Safety and Warranty Guide can also be obtained online from the Lenovo® Support Web site at: http://support.lenovo.com.

40User Guide