Lenovo ThinkStation P900, Hardware Maintenance Manual, Page: 41 / 218

Figure 4. Locating major FRUs and CRUs
The following table lists the major FRUs shown in Figure 4 “Locating major FRUs and CRUs” on page 32 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
Power supply assembly Yes No
2
Flex adapter (some models) No Yes
3
M.2 solid-state drive (some models) Yes No
4
Multi-function bracket 1 Yes No
5
Front fan assembly 1 Yes No
6
Memory modules (amount varies by model) Yes No
7
Battery Yes No
8
Optical drive Yes No
9
Front-access storage enclosure No Yes
10
Flex module Yes No
11
Hard disk drive, hybrid drive, or solid-state drive
(amount and combination vary by model) Yes No
12
Front fan assembly 2 Yes No
13
Multi-function bracket 2 Yes No
14
Cover presence switch (intrusion switch)
No No
15
Internal speaker No No
16
Heat sink and fan assembly 1 No Yes
17
Keyboard Yes No
18
Mouse Yes No
19
PCI card (vary by computer model)
Yes No
20
Heat sink and fan assembly 2 (some models) No Yes
21
Rear fan assembly Yes No
22
Microprocessor 1 No No
23
Microprocessor 2 No No
24
System board
No No
25
Direct cooling air baffle Yes No
26
Super capacitor module (some models) No No
Chapter 2
.
Product overview
33