Replacing Power Supply Units This section describes how to remove and replace a power supply unit in CX, DX, EX, and Granite 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, GC2000, and GC3000 systems. These systems 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 systems 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 1‑14. Removing the Power Supply Unit from 1U and 2U Series xx55, xx60, DX, GC2000, and GC3000 Systems 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.