Understanding Replaceable Parts - Lenovo ThinkCentre M715q User Manual And Hardware Maintenance Manual

Replacing hardware

Understanding replaceable parts

Customer-Replaceable Units (CRUs)
CRUs are computer parts that a user can upgrade or replace. There are two types of CRUs: self-
service and optional-service.
Self-service CRUs
Note
Users are responsible for replacing all self-service CRUs.
Optional-service CRUs
Field-Replaceable Units (FRUs)
FRUs are computer parts that a trained technician can upgrade or replace.
For detailed FRU information, such as the FRU part numbers and supported computer models, go
to:
http:/www.lenovo.com/serviceparts-lookup
CRUs and FRUs locations
Refer to the following illustrations to check the locations of CRUs and FRUs within the computer.
Note
Some of the following parts are optional on some models.
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You can install self-service CRUs easily. These CRUs might be standalone,
latched, or secured by up to two screws.
Examples of self-service CRUs include the keyboard, mouse, any USB device,
and the power cord. Other self-service CRUs might include memory modules,
adapter cards, hard disk drives, and optical drives.
Handling optional-service CRUs requires some technical skills and simple tools
(such as a screwdriver).
These CRUs are isolated parts within the computer. They are usually concealed
by an access panel that is secured by more than two screws. You must remove
the screws and panel to access the specific CRU.
Optional-service CRUs can be removed and installed by users or, during the
warranty period, by a Lenovo service technician.