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Appendix B. Customer Replaceable Units (CRUs)
Customer Replaceable Units (CRUs) are computer parts that can be upgraded or
replaced by the customer. There are two types of CRUs: internal and external. External
CRUs are easy to install, whereas internal CRUs require some technical skills and in
some cases might require tools such as a screwdriver. However, both internal and
external CRUs are safe for removal by the customer.
Customers are responsible for replacing all external CRUs. Internal CRUs can be
removed and installed by customers or by a Lenovo service technician during the
warranty period.
Your computer contains the following types of external CRUs:
External CRUs (pluggable): These CRUs unplug from the computer. Examples of
these types of CRUs include the AC adapter and power cord.
External CRUs with latches: These CRUs include a latch to help you remove and
replace the part. Examples of these types of CRUs include the notebook main battery,
an optical drive, a hard-disk drive, and an extended battery.
Your computer contains the following types of internal CRUs:
Internal CRUs (located behind an access panel): These CRUs are isolated parts
within the computer that are concealed by an access panel that is typically secured by
either one or two screws. Once the access panel is removed, only the specific CRU is
visible. Examples of these types of CRUs include memory modules and hard disk
drives.
Internal CRUs (located within the product): These CRUs are accessible only by
opening the computer’s outer case. Examples of these CRUs include PCI Express
Mini Cards and the integrated keyboard.