Lenovo ThinkCentre M83, Hardware Maintenance Manual

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• 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 FRU description
Self-service CRU Optional-service CRU
1
Power supply assembly No Yes
2
Heat sink and fan assembly No Yes
3
Memory modules Yes No
4
Primary hard disk drive Yes No
5
Internal speaker (available in some models)
Yes No
6
Optical drive Yes No
7
Front USB assembly (available in some models) No Yes
8
Thermal sensor No Yes
9
Front Wi-Fi antenna Yes No
10
Front fan assembly No Yes
11
Front audio and USB assembly
No Yes
12
Secondary hard disk drive (available in some
models) Yes No
13
System board No No
14
Battery No No
15
Microprocessor No Yes
16
Peripheral Component Interconnect (PCI) card
(available in ThinkCentre® M93/p computers) Yes No
17
Wi-Fi units Yes No
18
Wi-Fi antenna adapter Yes No
19
Rear Wi-Fi antenna Yes No
20
Cover presence switch (intrusion switch)
(available in some models) Yes No
21
Rear fan assembly No Yes
22
Keyboard Yes No
23
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
Locating parts on the system board
Note: Your computer comes with one of the following system boards.
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ThinkCentre M83 and M93/p Hardware Maintenance Manual