Lenovo ThinkCentre Edge 72 Hardware Maintenance Manual (HMM) for ThinkCentre E - Page 75

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 16 17 FRU description Power supply assembly Heat sink and fan assembly Microprocessor Memory modules Optical drive Front WiFi antenna Front audio and USB assembly Front bezel Hard disk drive System board Battery WiFi card module WiFi adapter card Rear WiFi antenna Peripheral Component Interconnect (PCI) card (installed in some models) Keyboard Mouse Self-service CRU No Yes No Yes Yes No No Yes No No Yes No No Yes Yes Optional-service CRU Yes No Yes No No Yes Yes No Yes No No Yes Yes No No Yes No Yes 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 71