Replacing internal cables (S3400-H)

You can replace the following internal cables or components on an S3400-H:

• Interface cable
• RMB ribbon cable
• SCSI drive activity indicator cable

Replacing the interface cable

The interface cable links several internal systems, including fan power and tachometer cable, and a 3-pin connector to the SCSI RAID backplane.

To replace the interface cable:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious damage.
2. Shut down the system and unplug the AC power cords.
3. Remove the front bezel and top cover.
4. Remove the circuit card hold-down bracket.
5. Remove the old interface cable as follows. See Replacing the interface cable.
   1. Unplug the 4-pin power cable.
   2. Unplug the two 3-pin connectors to the fans.
   3. Remove any cable ties as needed to remove the interface cable.
   4. Unplug the 5-pin fan monitor cable to the RMB.
   5. Unplug the 3-pin J6 cable to the SCSI RAID backplane. See S3400-H drive cage cabling.
6. Install the new interface cable by reversing the removal steps (see step 5).
7. Replace the circuit card hold-down bracket.
8. Replace the top cover and front bezel.
9. Restore power to the system.

If the system boots correctly, the new cable should be working.

Replacing the RMB ribbon cable

The S3400-H uses a Remote Maintenance Board (RMB) for diagnostics and troubleshooting. The ribbon cable for this board can be replaced.

To replace the RMB ribbon cable:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious damage.
2. Shut down the system and unplug the AC power cords.
3. Remove the front bezel and top cover.
4. Remove the circuit card hold-down bracket.
5. Remove the old RMB ribbon cable as follows. See Replacing an RMB ribbon cable.
   1. Unplug the flat ribbon cable from the 10-pin connector near the top of the RMB board.
   2. Unplug the 5-pin fan monitor cable (press the clip on the connector to release it).
   3. Open the tie-down strap that dresses the cables to the front LED panel.
   4. Remove the 4-pin RMB interface cable from the tie-down clip.
   5. Unplug the 4-pin RMB interface cable from the LED panel (J7).
   6. Remove the RMB ribbon cable. Set it aside.
6. Install the new RMB ribbon cable by reversing the removal steps (see step 5).
7. Replace the circuit card hold-down bracket.
8. Replace the top cover and front bezel.
9. Restore power to the system.
10. After the system boots, verify that the new cable is working correctly by checking RMB operation.

Replacing the S3400-H SCSI drive activity indicator cable

The S3400-H contains an additional replaceable cable that allows SCSI drive activity to be displayed on the front LED panel.

To replace the SCSI drive activity indicator cable:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious damage.
2. Shut down the system and unplug the AC power cords.
3. Remove the front bezel and top cover.
4. Remove the circuit card hold-down bracket.
5. Remove the old SCSI drive activity indicator cable as follows.
   1. Open the tie-down strap that dresses the cables to the front LED panel.
   2. Unplug the 10-pin SCSI drive activity indicator cable (J8).
      See Replacing the S3400-H LED panel.
   3. Undress the cable from the tie-down clip.
   4. Unplug the other end of the 10-pin cable from the SCSI RAID backplane (J7).
      See S3400-H drive cage cabling.
   5. Remove the SCSI drive activity indicator cable. Set it aside.
6. Install the new SCSI drive activity indicator cable by reversing the removal steps (see step 5).
7. Replace the circuit card hold-down bracket.
8. Replace the top cover.
9. Restore power to the system.
10. After the system boots, verify that the new cable is working correctly by checking the SCSI drive activity indicator lights on the front LED panel.
11. When finished, replace the front bezel.

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