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Chapter 11. Replacing FRUs (for machine types: 3688, 3690,
3691, 3693, and 3695)
This chapter provides information about the FRU replacement instructions.
Important: Do not open your computer or attempt any repair before reading and understanding the
“Important Safety Information” on page 1.
Note: FRU replacements are to be done only by trained service technicians.
Installing or replacing hardware
This section provides instructions on how to install or replace hardware for your computer. You can expand
the capabilities of your computer and maintain your computer by installing or replacing hardware.
Attention:
Do not open your computer or attempt any repair before reading and understanding “Important Safety Information”
on page 1.
Notes:
1. Use only computer parts provided by Lenovo.
2. When installing or replacing an option, use the appropriate instructions in this section along with the
instructions that come with the option.
Handling static-sensitive devices
Do not open the static-protective package containing the new part until the defective part has been removed
from the computer and you are ready to install the new part. Static electricity, although harmless to you, can
seriously damage computer components and parts.
When you handle parts and other computer components, take these precautions to avoid static-electricity
damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always handle parts and other computer components carefully. Handle PCI cards, memory modules,
system boards, and microprocessors by the edges. Never touch any exposed circuitry.
• Prevent others from touching the parts and other computer components.
• Before you replace a new part, touch the static-protective package containing the part to a metal
expansion-slot cover or other unpainted metal surface on the computer for at least two seconds. This
reduces static electricity from the package and your body.
• When possible, remove the new part from the static-protective packaging, and install it directly in the
computer without setting the part down. When this is not possible, place the static-protective package
that the part came in on a smooth, level surface and place the part on it.
• Do not place the part on the computer cover or other metal surface.
Installing external options
You can connect external options to your computer, such as external speakers, a printer, or a scanner. For
some external options, you must install additional software in addition to making the physical connection.
When installing an external option, see “Locating connectors, controls, and indicators on the front of your
computer” on page 79 and “Locating connectors on the rear of your computer” on page 80 to identify the
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