Service manual

Power Cabinet Component Removal and Replacement 5-19
Removal
1. If the operating system in control of the PCI containing the target FRU
supports hot-swap I/O and taking the I/O resources away from it will allow
it to continue to operate, follow operating system procedures to put the local
I/O riser into the hot-swap state. See Section 4.3.1 and skip to step 4.
2. If the system is not partitioned, shut down the operating system and issue
the SRM power off command. Put the OCP switch in the Off position.
Skip to step 4.
3. If the system is partitioned, from the console connected to the partition to
which the PCI box containing the target FRU is attached, shut down the
operating system and power it off using the SRM power off command.
Put
the OCP switch in the Secure position.
4. Unplug the power supplies in the target PCI box.
5. In systems that have two or more master PCI boxes, access to a particular
SCSI disk depends on whether it is in the PCI box at the top of a cabinet or
underneath another PCI box. If the broken disk is in the top PCI box, you
may be able to get to it without taking the box out of the cabinet. If, on the
other hand, the broken device is in a PCI box underneath another box,
determine whether you need to remove the box from the cabinet or not.
Follow the appropriate procedure described in Section 5.1 step 7 or 8.
6. Unplug the power and signal cables from the SCSI disk and fold them out of
the way.
7. Unscrew the two captive screws that hold the bracket with the SCSI disk in
place.
8. Remove the SCSI disk and bracket by sliding it toward the front of the PCI
box and once its tab is free lifting it from the box.
9. Unscrew the four screws holding the disk to the bracket.
Replacement
Reverse the steps outlined in the removal procedure.
Verification
Power up the system and check that the SCSI device powers up without error.