Lenovo ThinkPad T420si (English) User Guide - Page 109

Replacing devices, Static electricity prevention, Replacing memory

Page 109 highlights

Chapter 6. Replacing devices You can increase the capacity of the memory or the hard disk drive by replacing the original, built-in device with an optional one. Or, if you need to, you can replace the PCI Express Mini Card by following the procedures in this section. • "Static electricity prevention" on page 93 • "Replacing memory" on page 93 • "Replacing the backup battery" on page 96 • "Replacing the battery" on page 97 • "Replacing the hard disk drive" on page 99 • "Replacing the keyboard" on page 102 • "Replacing the mSATA solid state drive" on page 107 • "Replacing the PCI Express Mini Card for wireless LAN/WiMAX connection" on page 110 • "Replacing the PCI Express Mini Card for Wireless WAN " on page 119 • "Replacing the SIM card" on page 123 • "Replacing the solid state drive" on page 124 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 CRU, do not open the static-protective package containing the part until the instructions direct you to install it. 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 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 in the package and your body. • When possible, remove the static-sensitive part from the static-protective packaging and install the part without setting it down. When this is not possible, place the static-protective packaging on a smooth, level surface and place the part on it. • Do not place the part on the computer cover or other metal surface. Replacing memory Before you start, print these instructions. Prerequisites for the procedure When replacing the memory, be sure to follow the precautions © Copyright Lenovo 2012 93

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Chapter 6.
Replacing devices
You can increase the capacity of the memory or the hard disk drive by replacing the original, built-in
device with an optional one. Or, if you need to, you can replace the PCI Express Mini Card by following
the procedures in this section.
“Static electricity prevention” on page 93
“Replacing memory” on page 93
“Replacing the backup battery” on page 96
“Replacing the battery” on page 97
“Replacing the hard disk drive” on page 99
“Replacing the keyboard” on page 102
“Replacing the mSATA solid state drive” on page 107
“Replacing the PCI Express Mini Card for wireless LAN/WiMAX connection” on page 110
“Replacing the PCI Express Mini Card for Wireless WAN ” on page 119
“Replacing the SIM card” on page 123
“Replacing the solid state drive” on page 124
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 CRU, do not open the static-protective package containing the part until the instructions direct you
to install it.
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 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 in the package and your body.
When possible, remove the static-sensitive part from the static-protective packaging and install the part
without setting it down. When this is not possible, place the static-protective packaging on a smooth,
level surface and place the part on it.
Do not place the part on the computer cover or other metal surface.
Replacing memory
Before you start, print these instructions.
Prerequisites for the procedure
When replacing the memory, be sure to follow the precautions
© Copyright Lenovo 2012
93