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The following table lists the major FRUs shown in “” on page and identies which FRUs are also 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
specic CRU is visible.
Number FRU description
Self-service CRU Optional-service CRU
1
System board shielding
No No
2
Heat sink assembly No No
3
Microprocessor fan assembly
No No
4
Power supply assembly No No
5
Hard disk drive No No
6
Optical drive
No No
7
Main bracket No No
8
LCD panel
No No
9
Front bezel No No
10
Internal speaker No No
11
Rear I/O assembly
No No
12
Rear I/O shielding
No No
13
Power connector bracket No No
14
Power supply assembly cage No No
15
System board
No No
16
Microprocessor 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
70 ThinkCentre Hardware Maintenance Manual