Lenovo ThinkCentre M79, Hardware Maintenance Manual

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The following table lists the major FRUs shown in Figure 4 “Component locations” on page 32 and identifies
which FRUs also are 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 FRU description Self-service CRU Optional-service CRU
1
Power supply assembly No Yes
2
Microprocessor No Yes
3
Memory module Yes No
4
Optical drive (available on some models) Yes No
5
Front Wi-Fi antenna (available on some models) No Yes
6
Front bezel Yes No
7
Front audio and USB assembly No Yes
8
Slim card reader (available on some models) No Yes
9
Thermal sensor No Yes
10
Front fan assembly No Yes
11
Hard disk drive No Yes
12
Battery Yes No
13
System board No No
14
Wi-Fi card module (available on some models)
No Yes
15
Wi-Fi adapter card (available on some models) No Yes
16
Rear Wi-Fi antenna (available on some models) Yes No
17
PCI Express card Yes No
18
Heat sink and fan assembly
No Yes
19
Keyboard Yes No
20
Mouse Yes No
Chapter 2
.
Product overview
33