Number Description Self-service CRU Optional-service CRU1 3.5-inch hard disk drive* Yes No2 2.5-inch hard disk drive* Yes No3 Hard disk drive bracket* Yes No4 Storage drive cable* No No5 Coin-cell battery No Yes6 Heat sink for the M.2 solid-state drive* Yes No7 Wi-Fi card* No No8 Wi-Fi card shield* No No9 M.2 solid-state drive* Yes No10 Optical drive bracket* Yes No11 Optical drive* Yes No12 Optical drive cable* No No13 Card reader bracket* No No14 Card reader* No No15 Internal speaker No No16 ThinkCentre LED dot No No17 Front bezel Yes No18 Wi-Fi antennas* No No19 Vertical stand* Yes No20 Power cord Yes No21 Mouse* Yes No22 Keyboard* Yes No23 Power supply assembly No No24 PCI-Express card* Yes No25 Cover presence switch* Yes No26 Chassis No No27 Wi-Fi antenna cover* No No28 Memory module No No29 System board No No30 Microprocessor No No31 Heat sink and fan assembly No No32 Computer cover No No* for selected modelsFor detailed FRU and CRU information, such as the FRU part numbers and supported computer models, goto:http://www.lenovo.com/serviceparts-lookupChapter 6. Hardware removal and installation 53