Troubleshooting guide

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If anything seems wrong, immediately turn off the power.
• If smoke or an unusual smell is emanating from the Switch, or if liquid is spilled into the
Switch or a foreign object falls into the Switch, immediately turn off Switch power as
described below. Continuing operation could result in fire or electric shock.
Actions to take for abnormal conditions
Do not allow any foreign objects to get into the Switch.
• Do not insert or drop any foreign objects, such as anything metallic or flammable, through
the Switch's ventilation slots. Doing so could result in fire or electric shock.
When pressing the RESET button, do not use anything with a fragile tip, or
anything that might become caught in the Switch, such as a pin or paper
clip.
• When pressing the RESET button, do not use anything with a fragile tip, or anything that
might become caught in the Switch, such as a pin or paper clip. Doing so could result in
fire or electric shock.
Do not modify the Switch.
• Do not modify the Switch. Doing so could result in fire or electric shock.
Do not subject the Switch to shocks.
• In the event that the Switch is dropped or any of its components are damaged, turn off the
power, unplug the power cable, and contact maintenance personnel. Discontinue using the
cable to avoid the risk of fire or electric shock.
Do not place any objects on the Switch.
• Do not place any metallic object such as a small pin or a paper clip or any container with
a liquid, such as a vase or a flowerpot, on the Switch. Liquid or metallic objects falling into
the Switch could result in fire or electric shock.
Device in which an error occurred Action to take
AC models
AC (PoE) models
When an external
redundant power unit
(EPU) is not used
Turn off the Switch and unplug the power cable.
When an external
redundant power unit
(EPU) is used
Turn off the Switch and the power supply module supplying
power to the Switch, and then unplug the power cable.
DC models Turn off the Switch, and then set the power supply circuit
breaker to OFF.
Redundant power models When an AC power supply
unit is installed
Turn off all power supply units installed on the Switch, and
then unplug the power cable.
When a DC power supply
unit is installed
Turn off all power supply units installed on the Switch, and
then set the power supply circuit breaker to OFF.
EPU Turn off the EPU, and then unplug the power cable.