Lenovo ThinkStation 2551 Hardware Maintenance Manual page 88

Figure 8. Locating major FRUs and CRUs
The following table lists the major FRUs shown in Figure 8 "Locating major FRUs and CRUs" on page 82 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.
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ThinkStation Hardware Maintenance Manual