Lenovo Chromebook N21 User Manual page 3

The motherboard is made up of many sophisticated integrated circuits and
other components that are easily damaged by static electricity, Please read the
manual and prepare the following instructions before installation:
Please confirm that the size of the chassis is consistent with the
motherboard before installation.
Please do not tear up the serial number and agent warranty sticker on
the motherboard before installation, otherwise it will affect standard of product
warranty.
To install or remove the motherboard and other hardware devices, please
be sure to turn off the power before, and removal of power cord from outlet.
When you install other hardware devices to the motherboard socket, make
sure the interface and socket is closely.
Take the motherboard, please try your best to avoid touching the metal
connection parts to avoid short circuits in the line. Take the motherboard, CPU
or when the memory, it is best to wear anti-static bracelet.
If no ESD bracelet, make sure your hands dry, and touch the metal to
dissipate the static charge. Before the boards are not installed, first placed in
anti-static mat or anti-static bags.
When you want to remove the motherboard power supply when the plug
from the socket, make sure that power supply is turned off. In before power on
make sure that the power supply voltage of the voltage value is set in the area
of standard values in make sure all hardware devices before turning on the
power supply cable and the power cord is correctly connected.
Do not let the screw contacts on the motherboard circuit or part to avoid
Board damage or failure.
Please make sure that no screws or metal in or on the motherboard inside
the computer chassis. Do not place the computer in unstable.
Precaution