Hardware Maintenance Manual This manual contains service and reference information for ThinkCentre® computer machine types listed on the front cover. This manual is intended only for trained Service Providers who are familiar with Lenovo® computer products. Note: Be sure to read and understand the Chapter 2 “Safety information” on page 3 before using the information in this manual. The “Symptom-to-FRU Index” chapter and the “Additional service information” chapter apply to all ThinkCentre computers. This manual includes a complete FRU part number list for each machine type listed on the front cover.