Disk unit backplane

Use this procedure to service the disk unit backplane.

1. Power off the unit

   Power should be removed from the unit containing the disk unit backplane. If this unit is powered on, power it off now.

2. Disconnect the power cords

   Disconnect all power cords from the unit you are servicing.

3. Remove the front cover

   Note to expansion unit users: The instructions in this procedure are written based on the rack model. Expansion unit users can still use this procedure; however, expansion unit users should ignore specific references to rack-only features such as rack doors, rack thumbscrews, and rack-specific FRU orientation. Open the front rack door. Remove the two thumbscrews (A) that secure the system unit (B) to the rack. Push the cover release latches (C) in the direction of the arrows to release the cover from the system unit. Pull the cover out and away from the system unit.

4. Disconnect the external cables

   Label and disconnect the external cables connected to the FRU you are servicing.

5. Remove the control panel

   Release the control panel by pressing the release tab (A) to the left. Grasp the edges of the control panel and pull it partially out of the bay. Disconnect the control panel cables (B) from the control panel. Press the release tabs (C) inward and pull the control panel completely out of the bay.

6. Place into service position

   Note to expansion unit users: The instructions in this procedure are written based on the rack model. Expansion unit users can still use this procedure; however, expansion unit users should ignore specific references to rack-only features such as rack doors, rack thumbscrews, and rack-specific FRU orientation. Attention: When placing the model rack into the service position, it is essential that all stability plates are firmly in position to prevent the rack from toppling. Ensure that only one system unit is in the service position at a time. Remove two screws (A) securing the system unit (B) to the rack.

7. Place into service position (continued)

   While holding the system unit release latches (A) down on both the left and right sides, pull the system unit (B) out from the rack until the rails are fully extended and locked. Notes: Ensure that the cables at the back of the system unit do not catch or bind as you pull the unit forward in the rack. When the system unit rails are fully extended, the rail safety latches lock into place. This action prevents the system from being pulled out too far.

8. Remove the service access cover

   Loosen the two thumbscrews (A) located at the back of the cover. Slide the cover (B) toward the back of the system unit. When the front of the service access cover has cleared the upper frame ledge, lift the cover up and off the system unit. Attention: For proper cooling and airflow, replace the cover before turning on the system. Operating the system without the cover for more than 30 minutes could damage the system components.

9. Remove the fans

   While squeezing the latch (A), reach through the hole of the fan and pull the fan out of the fan cage. Repeat these steps until all system fans are removed from the fan cage.

10. Remove the air baffles

    Grasp the air baffles and pull them out of the fan cage.

11. Remove the fan cage

    Loosen the two retaining thumbscrews (A) that secure the fan cage to the system board. Lift the fan cage (B) up and out of the enclosure.

12. Disconnect the cables, if any, from the back of the disk drive backplane

    Media device cable connector (A) can remain connected. Squeeze the media device cable connectors (B) and (C)as shown and disconnect them from their connector sockets on the disk unit backplane. Note: Some systems might have additional cables attached to the disk unit backplane; not all cabling options appear in the illustration. If there are other cables connected to the disk unit backplane, disconnect them from their connector sockets on the disk unit backplane, noting their attachment points.

13. Remove the media device

    While pushing the media device release latches (A), grasp the device (B) and begin to pull it out of the system unit. Disconnect the cable attached to the back of the media device. Finish pulling the media device out of the system unit.

14. Remove the disk unit cage

    Rotate the handles outward in the direction shown to release the disk unit cage. Slide the disk unit cage out of the system unit.

15. Install the disk unit cage

    Slide the replacement disk unit cage into the system until you feel it lock. Rotate the handles in the direction shown to secure the disk unit cage.

16. Install the media device

    Connect the cable to the back of the media device (A). Push the media device (A) into the system unit until you feel the latches (B) lock.

17. Install the disk units and fillers

    Slide the disk units back into the disk unit cage. Push in the handles of each disk unit to lock them into place. Repeat these steps for any disk unit fillers that are present.

18. Connect the cables, if any, to the back of the disk unit backplane

    Media device cable (A) does not need to be touched. Connect the media device cables (B) and (C) to their connectors on the disk unit backplane. Reconnect any other cables that were detached previously. The illustration does not contain all cabling options.

19. Install the fan cage

    Lower the fan cage (A) into its location on the system board, aligning the locator pins through the holes. Tighten the two retaining thumbscrews (B) securing the fan cage to the system board.

20. Install the air baffles

    Lower the air baffles into their location in the fan cage. Push down on the air baffles until they lock into place.

21. Install the fans

    Lower the fan into its location in the fan cage. Push down on the fan until it locks into place. Repeat these steps until all system fans are installed.

22. Install the service access cover

    Place the service access cover (A) on the top of the system, about 25 mm (1 in.) from the front of the system. Hold the service access cover against the system unit and slide it toward the front of the system. The tabs of the service access cover slide beneath the upper chassis ledge. Align the two thumbscrews (B) located on the back of the service access cover with the two holes on the back of the system chassis. Tighten the thumbscrews to secure the service access cover.

23. Place into operating position

    To unlock the rail safety latches (B), slide the latches towards the front of the system. Push the system unit (A) back into the rack until both system-unit release latches have locked into position. Note: Ensure that the cables at the back of the system do not catch or bind as you push the system unit back into the rack.

24. Place into operating position (continued)

    Replace and tighten the two screws (B) that secure the system unit (A) to the rack.

25. Install the control panel

    Carefully slide the control panel partially into the control panel bay. Connect the control panel cables (A) to the control panel. Continue sliding the control panel into the bay until you feel the control panel lock into place.

26. Install the front cover

    Position the cover on the front of the system unit so that the two thumbscrews (C) align with the screw holes on the front of the system unit (A). Push the cover release latches (B) in the direction of the arrows to attach the cover to the front of the system unit as shown in the following figure. The latches should hold the cover in place. Tighten the thumbscrews. Close the front rack door.

27. Reconnect the external cables

    Reconnect the external cables you previously removed, to the FRU you are servicing.

28. Connect the power cords

    If you removed the power cords, connect all power cords to the unit you are servicing.

29. Go to Verifying a repair .