Removing an input power distribution assembly from a 5802 or 5877 expansion unit

Learn how to remove an input power distribution assembly from a 5802 or 5877 expansion unit if you need to replace a failing assembly.

1. Complete the prerequisite tasks described in Before you begin.
2. Identify the failing part as described in Identifying a failing part.
3. If the system is running, stop the system as described in Stopping the system or logical partition.
4. Open the back rack door.
5. At the rear of the expansion unit, disconnect both of the power cables as shown in Figure 1.
   Figure 1. Disconnecting the power cables from the rear of an expansion unit

   
6. Attach the wrist strap.
   Attention:

   • Attach a wrist strap to an unpainted metal surface of your hardware to prevent electrostatic discharge (ESD) from damaging your hardware.
   • When using a wrist strap, follow all electrical safety procedures. A wrist strap is for static control. It does not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
   • If you do not have a wrist strap, just prior to removing the product from ESD packaging and installing or replacing hardware, touch an unpainted metal surface of the system for a minimum of 5 seconds.
7. On the input power distribution assembly cover, loosen the thumbscrew (A), and then remove the cover as shown in Figure 2.
   Figure 2. Removing an input power distribution assembly cover

   
8. Loosen the thumbscrew (B) on the input power distribution assembly, and then pull the assembly out of the expansion unit as shown in Figure 3.
   Figure 3. Removing an input power distribution assembly