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.