Troubleshooting guide

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supply unit from a Switch, hold the power supply unit tightly. Pulling a power supply unit
carelessly from a Switch might cause the power supply unit to fall, resulting in injury. The
following label is attached to a DC power supply unit.
Do not touch the inside of the Switch with your hands.
• Do not carelessly put your hands inside the Switch. The frame and components might
cause injury.
Be careful of heat when removing a basic control unit or network interface
unit.
• Some components installed on a basic control unit or network interface unit might be hot.
Do not touch the installed components. Doing so could result in burns.
When removing a fan unit, do not put your hands near the rotating fan.
• The fan might be rotating just after it is removed. Do not put hands or fingers near the fan
while it is rotating. Doing so could result in injury. The following label is attached to a fan
unit.
Handle the power cable carefully.
• Do not place the power cable near a heat-generating apparatus. The heat could melt the
cable coating, resulting in fire or electric shock.
• When connecting or disconnecting the power cable from the outlet, always hold the plug,
not the cable itself. Pulling the cable itself might cause the wires to break.
Do not touch the Switch directly if you have a metal allergy.
• The Switch is coated with zinc, nickel, gold, and other elements. Do not touch the Switch
directly if you have an allergic reaction to these metallic elements. Doing so might cause
eczema or skin irritation.
Avoid looking directly at laser beams.
• Network interface units with the following label attached use laser beams. Never look
directly into the optical transceiver.