IBM 326m Hardware Maintenance Manual - Page 38

Power, checkout

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Power checkout Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the power distribution buses. Usually, a short circuit will cause the power subsystem to shut down because of an overcurrent condition. A general procedure for troubleshooting power problems is as follows: 1. Turn off the server, and disconnect all ac power cords. 2. Check for loose cables in the power subsystem. Also check for short circuits, for example, if there is a loose screw causing a short circuit on a circuit board. 3. Remove adapters and disconnect the cables and power connectors to all internal and external devices until the server is at the minimum configuration required to start the server (see "Minimum operating requirements" on page 97). 4. Reconnect all ac power cords and turn on the server. If the server starts successfully, replace adapters and devices one at a time until the problem is isolated. If the server does not start from the minimal configuration, replace FRUs of minimal configuration one at a time until the problem is isolated. To use this method, you must know the minimum configuration that is required for the server to start (see page 97). 28 326m Type 7969: Hardware Maintenance Manual and Troubleshooting Guide

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Power
checkout
Power
problems
can
be
difficult
to
solve.
For
example,
a
short
circuit
can
exist
anywhere
on
any
of
the
power
distribution
buses.
Usually,
a
short
circuit
will
cause
the
power
subsystem
to
shut
down
because
of
an
overcurrent
condition.
A
general
procedure
for
troubleshooting
power
problems
is
as
follows:
1.
Turn
off
the
server,
and
disconnect
all
ac
power
cords.
2.
Check
for
loose
cables
in
the
power
subsystem.
Also
check
for
short
circuits,
for
example,
if
there
is
a
loose
screw
causing
a
short
circuit
on
a
circuit
board.
3.
Remove
adapters
and
disconnect
the
cables
and
power
connectors
to
all
internal
and
external
devices
until
the
server
is
at
the
minimum
configuration
required
to
start
the
server
(see
“Minimum
operating
requirements”
on
page
97).
4.
Reconnect
all
ac
power
cords
and
turn
on
the
server.
If
the
server
starts
successfully,
replace
adapters
and
devices
one
at
a
time
until
the
problem
is
isolated.
If
the
server
does
not
start
from
the
minimal
configuration,
replace
FRUs
of
minimal
configuration
one
at
a
time
until
the
problem
is
isolated.
To
use
this
method,
you
must
know
the
minimum
configuration
that
is
required
for
the
server
to
start
(see
page
97).
28
326m
Type
7969:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide