Lenovo ThinkCentre Hardware Maintenance Manual page 82

The following table lists the major FRUs shown in Figure 6 "Locating major FRUs and CRUs for models with
the 23-inch display" on page 77 and identifies 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
specific CRU is visible.
Number
1
Frame stand (available on some models)
2
Thermal sensor
3
Heat sink
4
Battery
5
Microprocessor
6
Memory modules
7
Heat sink and fan assembly for graphics
processing unit (GPU) (available in some models)
8
Card reader (available in some models)
9
ExpressCard (available in some models)
10
WiFi card (available in some models)
11
System board
12
Rear I/O assembly
13
Power supply assembly
14
Rear PS/2 connectors and serial port assembly
15
WiFi antennas
16
Front bezel
17
Internal speaker
18
Frame foot (available on some models)
19
Bluetooth module (available in some models)
20
Internal speaker
21
Power switch and control button board
22
Volume control module
23
LCD panel
24
Hard disk drive
25
Optical drive (available in some models)
26
Converter board
27
Microprocessor fan
28
VESA (Video Electronics Standards Association)
mount bracket
78
ThinkCentre Hardware Maintenance Manual
FRU description Self-service CRU Optional-service CRU
Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
No
No
No
No
No
No
Yes
No
Yes
Yes
No
No
No
Yes
Yes
No
No
No
No
Yes
No
No
Yes
No
Yes
No
Yes
No
No
Yes
No
Yes
No
No
No
Yes
No
No
No
No
No
No
No
Yes
No
No