Replacing Power Supply Units
This section describes how to remove and replace a power supply unit in CX, DX, EX, and SteelFusion appliances.
Replacing Power Supply Units in 1U and 2U Appliances
This section describes how to replace a power supply in 1U CX1555 and EX1160 and 2U CX5055, CX7055, DX8000, EX1260, EX1360, SteelFusion Core 2000, and SteelFusion Core 3000 appliances. These appliances are equipped with replaceable, hot-swappable power supply units.
Caution: 
Use gloves when replacing the power supply units; they can become hot to the touch.
To replace power supply units in 1U and 2U appliances
1. Locate the defective power supply unit and remove the power cord.
2. Press the release tab toward the black handle, and pull the power supply unit toward you.
Figure: Removing the PSU from 1U and 2U xx55, xx60, DX, SteelFusion Core 2000, and SteelFusion Core 3000
Power Supply 0 (PS0) is on the left, and Power Supply 1 (PS1) is on the right.
3. Pull the power supply unit out of the chassis.
Caution: Put the defective power supply unit aside; wait until it cools down before touching it.
4. Slide in the new power supply unit until it mates with the back connectors in the chassis.
When the power supply unit is pushed all the way in, the button clicks to the right.
5. Plug the AC power cord into the new power supply unit.