Replacing a power supply or fan in a 5802 or 5877 expansion unit with the power turned on

Learn how to replace a power supply or power-supply fan in a 5802 or 5877 expansion unit if you removed a failing part or removed the assembly as part of another service action, and want to replace the power-supply assembly with the power turned on.

1. If you are replacing a power supply or power-supply fan because of a failure, remove the failing part. For instructions, see Removing a power supply or fan from a 5802 or 5877 expansion unit with the power turned on.
2. Complete the prerequisite tasks. For instructions, see Before you begin.
3. Open the front rack door.
4. 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.
5. Optional: If you must replace a failing power-supply fan, complete the following steps:
   1. Align the new fan with the opening in the power-supply assembly.
   2. Press the fan (A) into its connector in the assembly as shown in Figure 1.
   3. Tighten the thumbscrew (D) as shown in Figure 1.
      Figure 1. Replacing a fan

      
6. To replace the power supply, with the locking handle (A) in the open position, push the power supply into the expansion unit as shown in Figure 2.
   Figure 2. Replacing a power supply

   
7. Close the locking handle (A) until the power supply locks into position.
8. Reconnect the power cable (A) to the front of the power supply, and then slide the cable retention bracket (B) to the closed position to secure the cable as shown in Figure 3. By moving the bracket to the closed position, you turn on the power supply.
   Figure 3. Connecting the power cable to the front of an expansion unit

   
9. Note the state of the green ac power in (A) and offline converter assembly (OCA) power (B) light-emitting diodes (LEDs) shown in Figure 4, and do one of the following actions, as applicable:
   • If the LEDs indicate that the power supply is operating normally, that is, that the ac power in LED (A) is on solid and the OCA power (B) LED is on solid or flashing, continue to the next step.
   • If not, remove the power supply from the expansion unit and repeat the procedure starting with step 6. If, after repeating the procedure, the power supply is not operating normally, contact your service provider.
   Figure 4. Expansion unit ac power and OCA power LEDs

   
   Note: If you replaced a power-supply fan as part of this procedure, note the state of the fan fault LED (B) as shown in Figure 5. If the LED is off, indicating that both fans are operating normally, continue to the next step. If the LED is flashing or on solid, remove the power-supply assembly from the expansion unit and repeat the procedure starting with step 5. If, after repeating the procedure, the power-supply fan is not operating normally, contact your service provider.
   Figure 5. Fan fault LED

   
10. Verify the installed part. For instructions, see Verifying the installed part.
11. Close the front rack door.