Lenovo ThinkStation 2551, Руководство по техническому обслуживанию аппаратной части, Страница: 89 / 188

• 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 FRU description
Self-service CRU Optional-service CRU
1
Power supply assembly No Yes
2
Microprocessor No Yes
3
Heat sink and fan assembly No Yes
4
Optical drive (available in some models) Yes No
5
Power switch No Yes
6
Card reader (available in some models) No Yes
7
Front audio and USB assembly No Yes
8
System fan No Yes
9
Internal speaker No Yes
10
Thermal sensor Yes No
11
Cover presence switch (also called intrusion
switch, available in some models)
Yes No
12
Battery Yes No
13
Hard disk drive Yes No
14
Memory module Yes No
15
Peripheral Component Interconnect (PCI) card
(available in some models) Yes No
16
System board No No
17
Keyboard Yes No
18
Mouse 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 9
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