IBM i 830 Repair Manual page 945

Note: If the system has logical partitions and multiple logical partitions
own IOPs on the bus, then you must do the power off from the
Primary partition's console. When instructed to power on the
expansion tower or unit, do it from the console of the Primary
partition.
e. The "Confirm Power Off" display appears. Follow the instructions on the
display.
Note: You may be directed to perform a function 68 to power the tower
down and a function 69 to power the tower back on, or you may be
directed to do only a function 69 to power the tower back on. Make
a note of what you were instructed to do at this time! You will
need this information to complete the repair.
Ensure that the frame ID displayed is correct for the expansion tower or
unit that you intend to power off, and press the Enter key.
f. Wait for the expansion tower or unit to power off. This may take up to 15
minutes depending on the I/O configuration and number of buses in the
system power control network.
When the power off action is initiated, DST reports that the expansion
tower or unit is powered off successfully. However, to ensure that the
expansion tower or unit is actually powered off; verify that one of the two
air moving devices (AMD) in the expansion tower or unit has stopped and
that the power LED indicator on the expansion tower or unit control panel
is off.
Note: If the expansion tower or unit contains disk IOPs, an attention SRC
may appear on the control panel. Note the following:
v Ignore the SRCs if the expansion tower or unit completes the power
off procedure.
v If the expansion tower or unit does not power off in the maximum
time allowed, the system may be hung. You must power off the
entire system from the control panel to do the repair.
18. Were you directed to power off the tower to set the SPCN configuration ID?
No Yes
↓
You can now set the configuration ID in the Tower Card. When you
are instructed to power the tower on, go to step 28b on page 932 of
this procedure.
19. Is this an expansion tower with AC power cords connected from this tower's
AC input/charger to an SPCN controlled expansion unit? (For example: an FC
5078/0578 PCI expansion unit)?
Yes No
↓
This expansion tower or unit can be serviced without affecting an
SPCN controlled expansion unit. Go to step 26 on page 932 of this
procedure.
20. Servicing this expansion tower may affect an SPCN controlled expansion unit
that is receiving AC power from this tower. Continue with the next step in
this procedure.
21. You may be able to maintain AC power to the expansion unit and remove
power from this expansion tower so that you can service this tower. The
following steps will help you to determine what you can do.
Chapter 6. Data Recovery Procedures and General System Information
Data Recovery and General System Information
931