Power PIPs
Overview
This section contains the procedures necessary to isolate a failure in the system
power.
Unless instructed otherwise, always power off the system or expansion tower
where the FRU is located, (see “Powering On and Powering Off the System and
Logical Partitions” on page 922) before removing, exchanging, or installing a
field-replaceable unit (FRU).
The following safety notices apply throughout this section.
Read all safety procedures before servicing the system. Observe all safety
procedures when performing a procedure. Unless instructed otherwise, always
power off the system or expansion tower where the FRU is located, (see “Powering
On and Powering Off the System and Logical Partitions” on page 922) before
removing, exchanging, or installing a field-replaceable unit (FRU).
DANGER
To prevent a possible electrical shock from touching two surfaces with
different electrical grounds, use one hand, when possible, to connect or
disconnect signal cables. (RSFTD004)
DANGER
To prevent a possible electrical shock during an electrical storm, do not
connect or disconnect cables or station protectors for communications lines,
display stations, printers, or telephones. (RSFTD003)
DANGER
To prevent power from switching on automatically during service procedures,
select manual or secure mode on the system unit control panel or disconnect
the cables that connect to J15 and J16 on the frame being serviced.
(RSFTD211)
Power PIP3
This section contains the procedures necessary to isolate a failure in the system
power.
Attention: Disconnecting or removing the cryptographic I/O processor causes the
loss of the master encryption key.
The following safety notices apply throughout this section.
Read “Overview” before servicing the system.
This procedure tests the battery power unit for correct operation.
Note: Determine if the system has logical partitions. Go to “Determining if the
System Has Logical Partitions” on page 943, before continuing with this
procedure.
Power PIPs
Chapter 3. Problem Isolation Procedures (PIPs), Failing Items, and Symbolic FRU Isolation 387
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