Before replacing FRUs

Before replacing any Field Replaceable Units (FRUs), read the following:

Only certified and trained personnel can service the computer.
Before replacing an FRU, read the entire section on replacing the part.
Be extremely careful during writing operations such as copying, saving, or formatting.
The sequence of the drives in the computer that you are servicing might have been altered. If you select an incorrect drive, data or programs might be overwritten.
Replace an FRU only with another FRU of the correct model.
When you replace an FRU, ensure that the model of the machine and the FRU part number are correct by referring to the website: http://www.lenovo.com/serviceparts-lookup
An FRU should not be replaced because of a single, unreproducible failure.
Single failures can occur for a variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. Consider replacing an FRU only when a problem recurs. If you suspect that an FRU is defective, clear the error log and run the test again. If the error does not recur, do not replace the FRU.
Only replace a defective FRU.

Before replacing a FRU, click the illustration of the part to check the brief procedures.

Notes

Before replacing a FRU, ensure that you have read the instructions in the Handling static-sensitive devices.
To check the locations of FRUs, see CRUs and FRUs locations.
To replace a component that is in the list below, contact a Lenovo service technician. The support phone numbers are available at http://www.lenovo.com/support/phone.