Lenovo ThinkCentre M53 Hardware Maintenance Manual page 41

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
External optical drive (some models)
2
External hard disk drive (some models)
3
VESA mount bracket (some models)
4
Computer cover
5
ac power adapter bracket (some models)
6
ac power adapter
7
Microprocessor fan
8
Heat sink
9
Cover presence switch (intrusion switch) (some
models)
10
Memory module
11
Internal speaker
12
Front Wi-Fi antenna (some models)
13
Power button board
14
Coin-cell battery
15
System board
16
Hard disk drive assembly
17
Wi-Fi card module (some models)
18
Rear Wi-Fi antenna (some models)
19
Vertical stand (some models)
20
Keyboard
21
Mouse
For detailed FRU information, such as the FRU part numbers and supported computer models, go to:
http:/www.lenovo.com/serviceparts-lookup
FRU description Self-service CRU Optional-service CRU
No
No
No
Yes
Yes
Yes
No
Yes
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
.
Chapter 2
Yes
Yes
Yes
No
No
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
No
33
Product overview