Lenovo H420 Lenovo H4 Series Hardware Replacement Guide V1.0 - Page 4

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 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 all parts. It is expected that cables, switches, and certain mechanical parts can be replaced by trained service personnel without the need for step-by-step procedures. Note: Use only parts provided by Lenovo™. The description of the TV card in this manual applies only to machines which have a TV card. It does not apply to machines which do not have a TV card. This guide contains procedures for replacing the following parts: • Memory modules • Hard disk drive • Optical drive • Graphic Card • TV Tuner • WLAN Card • Heatsink & Fan • Keyboard • Mouse Safety information for replacing CRUs Do not open your computer or attempt any repair before reading the "Important safety information" in the Safety and Warranty Guide that was included with your computer. If you no longer have this copy of the Safety and Warranty Guide, you can obtain one online from the Support Web site at http://consumersupport.lenovo.com Hardware Replacement Guide  31045292_H4_HRG_EN_V1.0.indd 1 2010.9.19 11:11:05 AM