IBM x3655 Service Guide - Page 176

event/error

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v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See Chapter 4, "Parts listing, System x3655, Type 7985," on page 97 to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU). v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a trained service technician. System event/error log message Action +12V critical over voltage fault 1. If the OVER SPEC LED on the light path diagnostics panel is lit, or any of the four power channel error LEDs (A, B, C, or D) on the system board are lit, see the entries about power-channel error LEDs in "Power problems" on page 135. (See "System-board LEDs" on page 15). 2. If the actions in "Power problems" on page 135do not identify a defective component, complete the following steps: a. Remove the power supplies. Replace the power supplies one at a time, restarting the server each time, to isolate a failing power supply. b. If the server fails to start, replace the power backplane. Restart the server. c. If the server fails to start, (trained service technician only) replace the system board. +12V critical under voltage fault 1. If the OVER SPEC LED on the light path diagnostics panel is lit, or any of the four power channel error LEDs (A, B, C, or D) on the system board are lit, see the entries about power-channel error LEDs in "Power problems" on page 135. (See "System-board LEDs" on page 15). 2. If the actions in "Power problems" on page 135do not identify a defective component, complete the following steps: a. Remove the power supplies. Replace the power supplies one at a time, restarting the server each time, to isolate a failing power supply. b. If the server fails to start, replace the power backplane. Restart the server. c. If the server fails to start, (trained service technician only) replace the system board. +12V planar fault 1. If the OVER SPEC LED on the light path diagnostics panel is lit, or any of the four power channel error LEDs (A, B, C, or D) on the system board are lit, see the entries about power-channel error LEDs in "Power problems" on page 135. (See "System-board LEDs" on page 15). 2. If the actions in "Power problems" on page 135do not identify a defective component, complete the following steps: a. Remove the power supplies. Replace the power supplies one at a time, restarting the server each time, to isolate a failing power supply. b. If the server fails to start, replace the power backplane. Restart the server. c. If the server fails to start, (trained service technician only) replace the system board. 158 IBM System x3655 Type 7985: Problem Determination and Service Guide

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v
Follow
the
suggested
actions
in
the
order
in
which
they
are
listed
in
the
Action
column
until
the
problem
is
solved.
v
See
Chapter
4,
“Parts
listing,
System
x3655,
Type
7985,”
on
page
97
to
determine
which
components
are
customer
replaceable
units
(CRU)
and
which
components
are
field
replaceable
units
(FRU).
v
If
an
action
step
is
preceded
by
“(Trained
service
technician
only),”
that
step
must
be
performed
only
by
a
trained
service
technician.
System
event/error
log
message
Action
+12V
critical
over
voltage
fault
1.
If
the
OVER
SPEC
LED
on
the
light
path
diagnostics
panel
is
lit,
or
any
of
the
four
power
channel
error
LEDs
(A,
B,
C,
or
D)
on
the
system
board
are
lit,
see
the
entries
about
power-channel
error
LEDs
in
“Power
problems”
on
page
135.
(See
“System-board
LEDs”
on
page
15).
2.
If
the
actions
in
“Power
problems”
on
page
135do
not
identify
a
defective
component,
complete
the
following
steps:
a.
Remove
the
power
supplies.
Replace
the
power
supplies
one
at
a
time,
restarting
the
server
each
time,
to
isolate
a
failing
power
supply.
b.
If
the
server
fails
to
start,
replace
the
power
backplane.
Restart
the
server.
c.
If
the
server
fails
to
start,
(trained
service
technician
only)
replace
the
system
board.
+12V
critical
under
voltage
fault
1.
If
the
OVER
SPEC
LED
on
the
light
path
diagnostics
panel
is
lit,
or
any
of
the
four
power
channel
error
LEDs
(A,
B,
C,
or
D)
on
the
system
board
are
lit,
see
the
entries
about
power-channel
error
LEDs
in
“Power
problems”
on
page
135.
(See
“System-board
LEDs”
on
page
15).
2.
If
the
actions
in
“Power
problems”
on
page
135do
not
identify
a
defective
component,
complete
the
following
steps:
a.
Remove
the
power
supplies.
Replace
the
power
supplies
one
at
a
time,
restarting
the
server
each
time,
to
isolate
a
failing
power
supply.
b.
If
the
server
fails
to
start,
replace
the
power
backplane.
Restart
the
server.
c.
If
the
server
fails
to
start,
(trained
service
technician
only)
replace
the
system
board.
+12V
planar
fault
1.
If
the
OVER
SPEC
LED
on
the
light
path
diagnostics
panel
is
lit,
or
any
of
the
four
power
channel
error
LEDs
(A,
B,
C,
or
D)
on
the
system
board
are
lit,
see
the
entries
about
power-channel
error
LEDs
in
“Power
problems”
on
page
135.
(See
“System-board
LEDs”
on
page
15).
2.
If
the
actions
in
“Power
problems”
on
page
135do
not
identify
a
defective
component,
complete
the
following
steps:
a.
Remove
the
power
supplies.
Replace
the
power
supplies
one
at
a
time,
restarting
the
server
each
time,
to
isolate
a
failing
power
supply.
b.
If
the
server
fails
to
start,
replace
the
power
backplane.
Restart
the
server.
c.
If
the
server
fails
to
start,
(trained
service
technician
only)
replace
the
system
board.
158
IBM
System
x3655
Type
7985:
Problem
Determination
and
Service
Guide