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• If an adapter or a device consists of more than one FRU, any of the FRUs might be the cause of the error.

Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.

Strategy for replacing a hard disk drive

Always try to run a low-level format operation before replacing a hard disk drive. This will cause all customer
data on the hard disk drive to be lost. Be sure that the customer has a current backup of the data before
you perform this task.

Attention:

The drive startup sequence in the computer you are servicing might have been changed. Be

extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect
drive, data or programs can be overwritten.

If the computer you are servicing is shipped with both an mSATA solid-state drive and a hard disk drive, the
mSATA solid-state drive is used for the “cache” function and to support the Intel

Rapid Start Technology.

Users are not recommended to replace the mSATA solid-state drive by themselves.We recommend that
users do not replace the mSATA solid-state drive by themselves. Otherwise, the “cache” function will not
work and the Intel Rapid Start Technology cannot be used any more.

Attention:

Ensure that you partition the mSATA solid-state drive after installing it on the computer you are

servicing. Otherwise, the mSATA solid-state drive will not function correctly. For instructions on how to
partition an mSATA solid-state drive, go to http://www.lenovo.com/support/msata-fru.

Important notice for replacing a system board

Some components mounted on a system board are very sensitive. Improper handling of a system board can
cause damage to those components, and may cause a system malfunction.

Attention:

When handling a system board:

• Do not drop a system board or apply any excessive force to it.

• Avoid rough handling of any kind.

• Avoid bending a system board and hard pushing to prevent cracking at each Ball Grid Array (BGA) chipset.

How to use error codes

Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed,
begin the diagnosis with the first error code. Whatever causes the first error code might also cause false
error codes. If no error code is displayed, see whether the error symptom is listed in the “Symptom-to-FRU
Index” section.

Strategy for replacing FRUs for CTO, CMV, and GAV products

Product definition

Dynamic Configure To Order (CTO)

This provides the ability for a customer to configure a Lenovo solution from an eSite, and have this
configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label,
Product Entitlement Warehouse (PEW), and eSupport will load these products as the 4-digit MT and 3-digit
model, where model = “CTO” (example: 1829-CTO).

Hardware Maintenance Manual