Preparing the 9105-41B, 9105-42A, or 9786-42H system to remove and replace the system backplane

To prepare the system to remove and replace the system backplane, complete the steps in this procedure.

1. To check and record system vital product data settings, contact your next level of support.
2. Identify the part and the system that you are working on. For instructions, see Identifying a part.
   Use the blue identify LED on the enclosure to locate the system. Ensure that the serial number of the system matches the serial number to be serviced.
3. Stop the system. For instructions, see Stopping a system.
4. If necessary to view the identify LEDs or to manage cables at the rear of a rack-mounted system, open the cable management arm.
   CAUTION:

   To avoid causing damage to the arm, open the cable management arm just long enough to complete these repairs.
   Note: If you are removing or replacing the system backplane, you must open the cable management arm.
   1. Release the mounting bracket from the cable management arm assembly by pressing the indentation on the inner cable management arm tab.
      The cable management arm releases from the outer mounting bracket.

      

   2. Swing the cable management arm away from the system.

      In the image, the inner cable management arm tab is shown on the left side as you are facing the system from the rear. However, the cable management arm can also be installed so that the inner cable management arm tab is on the right side of the system.

5. Attach the electrostatic discharge (ESD) wrist strap. Your system has ESD jacks on the front and on the rear of the system as shown in the following figure. Plug the ESD wrist strap into the ESD jack.
   Attention:

   • Attach an electrostatic discharge (ESD) wrist strap to the front ESD jack, to the rear ESD jack, or to an unpainted metal surface of your hardware to prevent the electrostatic discharge from damaging your hardware.
   • When you use an ESD wrist strap, follow all electrical safety procedures. An ESD wrist strap is used 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 an ESD 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.

   

6. If the system power is turned off, label and disconnect the power cords from the system unit.
   Note: You can use the hook-and-loop fastener to attach the power cords to the system. If you are placing the system in a service position after you disconnect the power cords, ensure that you unstrap the fastener.

   

   (L003)

   

   or

   

   or

   

   or

   

   or

   

   

   

   DANGER

   Multiple power cords. The product might be equipped with multiple AC power cords or multiple DC power cables. To remove all hazardous voltages, disconnect all power cords and power cables. (L003)
7. Remove all the power supplies.
   1. To unseat the power supply from its position in the system, push the locking-tab to the left.
   2. Using the handle, pull the power supply out of the system.

      

   3. Repeat these steps for the remaining power supplies.
8. For a rack-mounted system, remove the front cover by pulling it away from the system.
   The cover has indentations where you can hold it more easily.
9. For a stand-alone system, remove the front cover and door by completing these steps.
   1. Insert the front door key into the lock. Twist the key to the left (counterclockwise) to unlock the door. Horizontal is locked; vertical is unlocked. Open the front door.

      

   2. Ensure that you have the electrostatic discharge (ESD) wrist strap on and that the ESD clip is plugged into a ground jack or connected to an unpainted metal surface. If not, do so now.
   3. Twist the cover latch to the left (counterclockwise) to unlock the cover. Vertical is locked; horizontal is unlocked.

      

   4. Pull the cover away from the system. The cover has an indentation where you can hold onto it more easily.

      

10. Label and disconnect all external cables that are attached to the adapters.
11. If the cable management arm is open, close it.
    1. Swing the cable management arm towards the server.
    2. Insert the inner cable management arm tab into the outer mounting bracket until it clicks into place. The inner mounting bracket is not used.

       

12. Loosen the front screws that secure the system unit to the rack.

    

13. For a rack-mounted system, remove the hook-and-loop fasteners that secure the cable management arms and put the system in the service position.
    1. Open the side latches and pull the latches to slide the system unit fully into the service position until the slides click and hold the system unit securely. Ensure that the screws inside the latches are not secured to the rack.

    Ensure that the cable management arms can move freely. Ensure that the cables at the rear of the system do not catch or bind as you pull the system unit into the service position.

    Do not pull out or install any drawer or feature if the rack stabilizer brackets are not attached to the rack. Do not pull out more than one drawer at a time. The rack might become unstable if you pull out more than one drawer at a time.

    

    

14. If you have a stand-alone system, carefully tilt the stand-alone system from its vertical position to lay it in a horizontal position. Position the system with the open service area up, and with a 3 cm (1.5") support along its top edge. The support is used to prevent the plastic handle from being damaged.

    

15. Remove the service access cover.
    Attention: Operating the system without the service access cover on for more than 5 minutes when the system power is turned on might damage the system components.
    1. Release the service access cover latch by pushing the release latch to the open position.
    2. Slide the cover off the system unit. When the front of the service access cover clears the upper frame ledge, lift the cover up and off the system unit.

       

       

16. To activate the identify LED for the faulty part, press and hold the push-button on the trusted platform module. The TPM card can be found in location P0-C22.
    Verify that the green LED on the TPM is lit, which indicates that sufficient power exists for the identify LED. If the green LED is not lit, use the location code to find the physical location by using the service label.

    

17. Look for the amber LED of the system backplane.

    

18. Lift the air baffle away from the system. Place the air baffle upside down on a clean area.