ThinkPad E550, User Manual, Page: 129 / 172

Chapter 10. Replacing devices
This chapter provides instructions on how to install or replace hardware for your computer.
• “Static electricity prevention” on page 113
• “Replacing the battery” on page 113
• “Replacing the keyboard” on page 115
• “Replacing the storage drive” on page 120
• “Replacing the optical drive” on page 123
• “Replacing a memory module” on page 126
• “Replacing the coin-cell battery” on page 128
Static electricity prevention
Static electricity, although harmless to you, can seriously damage computer components and options.
Improper handling of static-sensitive parts can cause damage to the part. When you unpack an option or
a CRU, do not open the static-protective package that contains the part until the instructions direct you
to install the part.
When you handle options or CRUs, or perform any work inside the computer, take the following precautions
to avoid static-electricity damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always handle components carefully. Handle adapters, memory modules, and other circuit boards by the
edges. Never touch exposed circuitry.
• Prevent others from touching components.
• When you install a static-sensitive option or CRU, touch the static-protective package that contains 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 in the package and your body.
• When possible, remove the static-sensitive part from the static-protective package and install the part
without setting it down. When this is not possible, place the static-protective package on a smooth,
level surface and place the part on the package.
• Do not place the part on the computer cover or other metal surface.
Replacing the battery
Before you start, print these instructions and read “Important safety information” on page vi.
This system supports only batteries specially designed for this specific system and manufactured by Lenovo
or an authorized builder. The system does not support unauthorized batteries or batteries designed for other
systems. If an unauthorized battery or a battery designed for another system is installed, the system will
not charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
Note: If an unauthorized battery is installed, the following message will be displayed: “The battery installed
is not supported by this system and will not charge. Please replace the battery with the correct Lenovo
battery for this system.”
© Copyright Lenovo 2014, 2015 113