Y550 UG V1.0_en.book Page 101 Wednesday, December 10, 2008 4:51 PM
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
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.