Lenovo G530 - Manual (Page 134)

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Appendix B. Customer Replaceable Units (CRUs)
Customer Replaceable Units (CRUs) are computer parts that the customer
can upgrade or replace. There are two types of CRU: self-service and
optional-service. Self-service CRUs are easy to install. They may be
standalone or latched, or require a screwdriver to remove a maximum of
two screws, whereas optional-service CRUs require some technical skill, as
well as tools such as a screwdriver. However, both self-service and
optional-service CRUs are safe for the customer to remove and replace.
Customers are responsible for replacing all self-service CRUs. Optional-
service CRUs can be removed and installed by customers or, during the
warranty period, by a Lenovo service technician.
Lenovo notebook computers contain both self-service and optional-service
CRUs:
ƒ
Self-service CRUs: these CRUs can be unplugged, or are secured by no
more than two screws. Examples of this type of CRU are the AC
adapter, the power cord, the battery, and the hard drive. In some
products, such components as memory, wireless cards, notebook
keyboards, and palm rests with fingerprint reader and touchpad may
also be CRUs.
ƒ
Optional-service CRUs: these CRUs are isolated parts within the
computer that are concealed by an access panel, which is typically
secured by more than two screws. Once the access panel is removed, the
CRU is visible. Both types of CRU are listed in the table on the following
page.