IBM iSeries 270 Service Manual page 580

b. From the Packaging Hardware Resources display, specify the Concurrent Maintenance option
for the expansion tower or unit that you are powering off, then press the power off PF key.
Note: If resources on the bus or buses are active, you will receive a message indicating which
resources are in use and the expansion tower or unit will not power off. Return to step 16 (See
page 567) of this procedure and ensure that all resources on the bus are varied off. Follow the
instructions on the screen for locating the active resources and varying them off.
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.
c. The Confirm Power Off display appears. Follow the instructions on the display. 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.
Attention: 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 Enter.
d. 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.
If the expansion tower or unit does not power off in the maximum time allowed, the system
v
may be hung. You must power off the entire system from the control panel to do the repair.
17. Were you directed to power off the tower to set the SPCN configuration ID?
v No: Continue with the next step.
v Yes: You can now return to the procedure that sent you here to set the configuration ID in the
tower card. When you are instructed to power the tower on, go to step 23b (See page 569).
18. 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 expansion I/O unit)?
Yes: Servicing this expansion tower may affect an SPCN controlled expansion unit that is
v
receiving ac power from this tower. Continue with the next step.
No: This expansion tower or unit can be serviced without affecting an SPCN controlled expansion
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unit. Go to step 21 (See page 569).
19. 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. Are you here to exchange the ac input/charger, any of the device boards, or the power board?
v Yes: You must search for an alternate ac power source for the expansion unit. An adapter cord for
ac wall power outlets may be available at the customer site or an alternate expansion tower with
ac power outlets may be close enough for the expansion unit's ac power cords to reach. Continue
with the next step.
No: You can maintain ac power to the expansion unit while you are servicing this tower. When the
v
expansion tower is powered off, open the rear cover and trace the ac jumper cords from the three
power supplies to the ac input charger. Then disconnect them at the ac charger. Power is now
removed from the components that you will be working with or near. Go to step 22 (See page 569)
20. Can you find an alternate ac power source for the expansion unit?
No: You must power off the system to service this tower. Do not attempt to power off the
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expansion unit. You must power on this expansion tower and then use dedicated service to power
568
Hardware (Remove and Replace; Part Locations and Listings)