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Replacing an AC Power Supply
Before you remove a power supply, be aware of the following:
•
The minimum number of power supplies must be present in the router at all times.
•
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each
power supply slot must contain either a power supply or a blank panel. If you remove a power supply,
you must install a replacement power supply or a blank panel shortly after the removal.
•
After powering off a power supply, wait at least 60 seconds before turning it back on.
To remove an AC power supply (see Figure 42 on page 130 for a representative AC power supply at the
rear of the chassis):
1. Switch off the dedicated customer site circuit breaker for the power supply, and remove the power
cord from the AC power source. Follow the instructions for your site.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis.
3. If the chassis has a power switch, move it to the off (O) position.
4. Unplug the power cord from the power source receptacle.
5. Unplug the power cord from the appliance inlet in the chassis above the power supply.
6. The AC power supply has a pull handle and a locking tab. Press the locking tab to the right while you
pull the unit out using the handle.
129
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