Lenovo ThinkCentre M92 Hardware Maintenance Manual (HMM) (May 2012) - ThinkCen - Page 97

The following table lists the major FRUs shown in Figure 15 "Component locations" on page 90 and identifies which FRUs also are self-service CRUs or optional-service CRUs. Notes: • 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 FRU description Computer cover System fan Microprocessor System board Heat sink Cover presence switch (Intrusion switch) Memory modules Power switch board ac power adapter WiFi card module Battery Internal speaker Hard disk drive Keyboard Mouse Self-service CRU Yes No No No Yes Yes No No Yes No Yes No No Yes Yes Optional-service CRU No Yes Yes No No No Yes Yes No Yes No Yes No 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 Chapter 8. Locations 91