Installation Guide

To replace a 450 W or 550 W AC power supply:
1. Disconnect the AC power cord from the wall outlet and from the power supply.
2. Note the orientation of the installed power supply.
3. For a Summit X670 series switch, note the direction of ventilation airflow, and verify that the power
supply airflow direction is the same as that of the switch.
In a switch with front-to-back airflow, the fan modules are labeled Air Out.
In a switch with back-to-front, the fan modules are labeled Air In.
4. Push the latching tab toward the power supply handle and pull outward on the handle to disengage
the power supply internal connectors.
See Figure 393.
Figure 393: Removing a 450 W or 550 W AC Power Supply
5. Carefully slide the power supply the rest of the way out of the switch.
Caution
Power supplies can become very hot during operation. Wear thermal protective gloves
when you remove a power supply from an operating switch.
Note
If you are not installing a replacement power supply, install a cover over the unoccupied
power supply bay. Unoccupied bays must always be covered to maintain proper system
ventilation and EMI levels.
6. Verify that the replacement power supply is oriented the same way as the unit you removed.
For a Summit X670 series switch, verify that the airflow direction of the power supply matches the
airflow direction of the switch.
Replacing a Summit 450 W or 550 W AC Power Supply
Replacing AC Power Supplies
456 Summit Family Hardware Installation Guide