8
Installing and Upgrading Fans in the Cisco 3825 Series Routers
78-18642-01B0
Safety Warnings and Guidelines
Warning
Do not touch the power supply when the power cord is connected. For systems with a power switch,
line voltages are present within the power supply even when the power switch is off and the power
cord is connected. For systems without a power switch, line voltages are present within the power
supply when the power cord is connected.
Statement 4
Warning
Do not work on the system or connect or disconnect cables during periods of lightning activity.
Statement 1001
Warning
Before opening the chassis, disconnect the telephone-network cables to avoid contact with
telephone-network voltages.
Statement 1041
Warning
Network hazardous voltages are present in the BRI cable. If you detach the BRI cable, detach the end
away from the router first to avoid possible electric shock. Network hazardous voltages also are
present on the system card in the area of the BRI port (RJ-45 connector), regardless of when power is
turned off.
Statement 44
Warning
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
disconnect the power at the circuit breaker on DC units.
Statement 12
Warning
When installing the unit, always make the ground connection first and disconnect it last.
Statement 42
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