Removing an input power distribution assembly from a 5802 or 5877 expansion unit with the power turned off

Learn how to remove an input power distribution assembly from a 5802 or 5877 expansion unit if you want to replace a failing assembly or replace the assembly as part of another service action.

1. Complete the prerequisite tasks. For instructions, see Before you begin.
2. Use the service indicator light-emitting diodes (LEDs) to help identify the part. For instructions, see Identifying a part.
3. If the system is running, stop the system. For instructions, see Stopping the system or logical partition.
4. Open the rear rack door.
5. Disconnect both the power cables at the rear of the expansion unit, 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. Pull out the assembly from the expansion unit, as shown in Figure 3.
   Figure 3. Removing an input power distribution assembly