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Replacing field-replaceable units (FRUs)
Before replacing FRUs
Before replacing an FRU (Field Replaceable Unit), 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.
To identify the FRU type of a computer component, see
Attention
Replacing field-replaceable units (FRUs)
Do not open your computer or attempt any repairs before reading the Important
Product Information Guide.
CRUs and FRUs locations.
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