Lenovo ThinkCentre M900z 10F2 Hardware Maintenance Manual page 41

Figure 4. Major FRUs and CRUs
The following table lists the major FRUs shown in the illustration above 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
UltraFlex II Stand
2
Tilt-only monitor stand base
3
Tilt-only monitor stand
4
Back cover
5
Computer cover
6
Side I/O cover
7
Memory module shield
8
System board shield
9
Side I/O bracket
10
VESA mount bracket
11
Cover presence switch (intrusion switch)
12
Wi-Fi antennas (2)
13
Integrated camera
14
Heat sink
15
LCD panel
16
Coin-cell battery
17
System board
18
Wi-Fi card
19
Memory module
20
Card reader
21
Serial connector module
22
Power cord
23
Thermal sensor
24
Internal speakers (2)
25
Power supply assembly
26
Storage drive
27
Optical drive holder
28
Optical drive
FRU description Self-service CRU Optional-service CRU
Yes
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
Yes
No
No
No
Yes
No
No
.
Chapter 2
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
33
Product overview