IBM iSeries 270 Service Manual page 574

Power off the system: Attention: Powering off and powering on a system with multiple partitions is
different than a system with a single partition. Read and understand the power off and power on
procedures referenced when a procedure directs you to power on or power off a system or partition.
Choose one of the following:
v If the system is operating under Dedicated Service Tools (DST), perform the following:
1. Power off the system by selecting Power off the system on the Start a Service Tool display.
2. To completely remove power from the system, turn off the UEPO switch, then disconnect both
power cords from the customer's receptacle.
v If the system is operating under OS/400:
1. Choose from the following:
– For consoles that run iSeries Access, a delayed power-off is required. Enter the PWRDWNSYS
command. You must stop all applications, including console applications, and subsystems that
are running, before the delayed power-off operation is complete.
– All others, enter the PWRDWNSYS command to power off the system.
2. To completely remove power from the system, turn off the UEPO switch, then disconnect both
power cords from the customer's receptacle.
v If you cannot use these methods, you can power off the system by using the "Control panel power
button" procedure below.
Control panel power button: Attention: Using the control panel Power push-button to power off the
system may cause unpredictable results in the data files, and the next IPL will take longer to complete.
1. Open the control panel cover.
2. Select Manual mode if it is not already selected. See iSeries Service Functions
.
3. Press the Power button (white) on the control panel. The Data-Function display shows O? (the
international power-off symbol).
4. Press the Power button (white) on the control panel again.
Note: To cancel the power-off operation, do not press the Power button a second time. Instead, press
any other control panel button.
5. The Power On light starts blinking at the fast rate of one blink per second as the system powers off.
The light starts blinking at the slow rate of one blink per three seconds when the power-off operation is
complete.
Does the system power off successfully?
v Yes: This ends the procedure.
v No: Perform the following:
a. Press the ^ or the V button until function 08 is shown in the Function display.
b. Press Enter. An SRC A100 8008 will appear on the Data display.
c. Press the Power button (white) on the control panel. The Data-Function display shows O? (the
international power-off symbol).
d. Press the Power button (white) on the control panel again. The system powers off and the
Power On light blinks at the slow rate of one blink per three seconds.
Note: To cancel the power-off operation, do not select function 08. Instead, press any other
control panel button.
This ends the procedure.
Power off a system with multiple logical partitions: Use the following table to determine if the system
must be powered off, or if only the secondary partition that you are servicing must be powered off.
562
Hardware (Remove and Replace; Part Locations and Listings)