Lenovo ThinkCentre M72z Hardware Maintenance Manual (HMM) for ThinkCentre M72z - Page 74

Optional-service CRUs: These CRUs are isolated parts within the computer and are concealed by an

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The following table lists the major FRUs shown in Figure 3 "Locating major FRUs and CRUs" on page 67 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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 FRU description System stand hinge cover System stand Computer cover System board shield window System board shield Handle bar Heat sink assembly Microprocessor Memory module Battery Microprocessor fan System board Card reader Internal speaker WI-FI connector Power supply Rear I/O connector Frame stand Internal speaker Control button board Hard disk drive LCD bracket LCD panel Inverter Optical drive VESA mount bracket Integrated camera Keyboard Mouse Self-service CRU 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 Yes Yes Optional-service CRU 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 No 68 ThinkCentre Hardware Maintenance Manual

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The following table lists the major FRUs shown in Figure 3 “Locating major FRUs and CRUs” on page 67 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
FRU description
Self-service CRU
Optional-service CRU
1
System stand hinge cover
No
No
2
System stand
No
No
3
Computer cover
No
No
4
System board shield window
No
No
5
System board shield
No
No
6
Handle bar
No
No
7
Heat sink assembly
No
No
8
Microprocessor
No
No
9
Memory module
No
No
10
Battery
No
No
11
Microprocessor fan
No
No
12
System board
No
No
13
Card reader
No
No
14
Internal speaker
No
No
15
WI-FI connector
No
No
16
Power supply
No
No
17
Rear I/O connector
No
No
18
Frame stand
No
No
19
Internal speaker
No
No
20
Control button board
No
No
21
Hard disk drive
No
No
22
LCD bracket
No
No
23
LCD panel
No
No
24
Inverter
No
No
25
Optical drive
No
No
26
VESA mount bracket
No
No
27
Integrated camera
No
No
28
Keyboard
Yes
No
29
Mouse
Yes
No
68
ThinkCentre Hardware Maintenance Manual