Lenovo ThinkCentre M92 Hardware Maintenance Manual (HMM) (May 2012) - ThinkCen - Page 81

• Self-service CRUs: These CRUs unplug or are secured by no more than two screws. Examples of these types of CRUs include the keyboard, the mouse, any USB device, and the power cord. Other self-service CRUs depending on product design might include memory modules, adapter cards, hard disk drives, and optical drives. • Optional-service CRUs: These CRUs are isolated parts within the computer and are concealed by an access panel that is typically secured by more than two screws. Once the access panel is removed, the specific CRU is visible. Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 FRU description Power supply assembly Heat sink and fan assembly Hard disk drive Internal speaker Optical drive Front bezel Front fan assembly Secondary hard disk drive Battery System board Peripheral Component Interconnect (PCI) card Memory modules Microprocessor Cover presence switch (Intrusion switch) Rear fan assembly Keyboard Mouse Self-service CRU No No Yes Yes Yes Yes No Yes Yes No Yes Yes No No No Yes Yes Optional-service CRU Yes Yes No No No No Yes No No No No No Yes Yes Yes No No Looking up FRU information For detailed FRU information, such as the FRU part numbers and supported computer models, go to: http:/www.lenovo.com/serviceparts-lookup Locating parts on the system board Note: Your computer comes with one of the following system boards. Chapter 8. Locations 75