NEC IP8800/S2400 Series Troubleshooting Manual page 19

■ Before powering off, turn off all power switches or breakers on the device.
• Multiple input power supplies are provided to the device. Before powering off, turn off all power switches
(when AC power supply is mounted) or breakers (when DC power supply is mounted) on the device. The
label below is attached to the device.
■ Work to add or replace equipment must be performed by a trained engineer or
maintenance personnel.
• To add or replace optional components must be performed by a trained engineer or maintenance
personnel. To add or replace a power supply involves to plug and unplug power cables; a person other than
the preceding ones may fail to handle things, which can cause fire disaster, electric shock, and equipment
failure. Other optional components, if handled mistakenly, can also cause fire disaster, wounds, and
equipment failure.
■ Do not press the switch on the basic control unit with a fragile tip, pin, or clip that may
get stuck and cannot be removed.
• Do not press the switch on the front panel of the basic control unit with a fragile tip, pin, or clip that may get
stuck and cannot be removed. Fire disasters or electric shock may be caused.
■ Before addition or replacement of the power supply, unplug the power cable.
• Remove the power cable from the power supply when adding or replacing it. With the power cable
connected, the power supply equipment may remain energized from some circuits even the power switch
is turned off. Therefore, adding or replacing the power supply with the power cable connected may cause
a fire or electric shock.
■ Keep air dusters away from fire.
• If you use an air duster with combustible gas to clean the optical connector, keep away from fire. Otherwise,
fire disaster may occur.
Safety Guide [IP8800/S6700]
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