Troubleshooting guide

xxxi
When pressing the button of the control and switching unit, 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 button on the front panel of the control and switching unit, 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.
Disconnect the power cable before adding or replacing a power supply
unit.
• When adding or replacing a power supply unit, disconnect the power cable from the power
supply unit to be replaced. If the power cable is connected and the power switch is turned
off, power is still supplied to some circuits. Because of this, if you add or replace a power
supply unit with the power cable connected, a fire or electric shock could result.
Do not use an air duster near a flame.
• When cleaning the optical connectors, do not use an air duster that contains flammable gas
near a flame. Doing so could result in a fire.