Hardware Installation and Replacement Guide This guide provides information about replacing Customer Replaceable Units (CRUs). This guide does not include procedures for all parts. It is expected that cables, switches, and certain mechanical parts be replaced by trained service personnel without the need for step-by-step procedures. Note: Use only parts provided by Lenovo®. This guide contains instructions for installing and or replacing the following parts: Battery Power supply Heat sink Hard disk drive Optical drive Diskette drive Memory modules PCI adapter System fan assembly Rear fan assembly Keyboard Mouse

Hardware Maintenance Manual This manual contains service and reference information for ThinkCentre® computers listed on the cover. It is intended only for trained servicers who are familiar with Lenovo computer products. Before servicing a Lenovo product, be sure to read the Safety Information. See Chapter 2, “Safety information,” on page 3. The Symptom-to-FRU Index and Additional Service Information chapters are not specific to any machine type and are applicable to all ThinkCentre computers. This manual includes a complete FRU part number listing for each machine type and model listed on the cover