IBM x3655 Service Guide - Page 177

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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 +5V critical over voltage fault 1. Remove the following devices, which are powered by 5 volts: v All PCI adapters v USB devices v CD-RW/DVD drive v Tape drive, if one is installed v Hard disk drive backplane 2. Reinstall each I/O device removed in step 1, one at a time, restarting the server each time, to isolate a defective device. Replace any defective device. 3. If the error continues, replace the power backplane. Restart the server. 4. If the error continues, (trained service technician only) replace the system board. +5V critical under voltage fault 1. Remove the following devices, which are powered by 5 volts: v All PCI adapters v USB devices v CD-RW/DVD drive v Tape drive, if one is installed v Hard disk drive backplane 2. Reinstall each I/O device removed in step 1, one at a time, restarting the server each time, to isolate a defective device. Replace any defective device. 3. If the error continues, replace the power backplane. Restart the server. 4. If the error continues, (trained service technician only) replace the system board. 5V fault 1. Remove the following devices, which are powered by 5 volts: v All PCI adapters v USB devices v CD-RW/DVD drive v Tape drive, if one is installed v Hard disk drive backplane 2. Reinstall each I/O device removed in step 1, one at a time, restarting the server each time, to isolate a defective device. Replace any defective device. 3. If the error continues, replace the power backplane. Restart the server. 4. If the error continues, (trained service technician only) replace the system board. +2.5V critical over voltage fault Information only. +2.5V critical under voltage fault Information only. +1.8V critical over voltage fault Information only. Chapter 5. Diagnostics 159

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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
+5V
critical
over
voltage
fault
1.
Remove
the
following
devices,
which
are
powered
by
5
volts:
v
All
PCI
adapters
v
USB
devices
v
CD-RW/DVD
drive
v
Tape
drive,
if
one
is
installed
v
Hard
disk
drive
backplane
2.
Reinstall
each
I/O
device
removed
in
step
1,
one
at
a
time,
restarting
the
server
each
time,
to
isolate
a
defective
device.
Replace
any
defective
device.
3.
If
the
error
continues,
replace
the
power
backplane.
Restart
the
server.
4.
If
the
error
continues,
(trained
service
technician
only)
replace
the
system
board.
+5V
critical
under
voltage
fault
1.
Remove
the
following
devices,
which
are
powered
by
5
volts:
v
All
PCI
adapters
v
USB
devices
v
CD-RW/DVD
drive
v
Tape
drive,
if
one
is
installed
v
Hard
disk
drive
backplane
2.
Reinstall
each
I/O
device
removed
in
step
1,
one
at
a
time,
restarting
the
server
each
time,
to
isolate
a
defective
device.
Replace
any
defective
device.
3.
If
the
error
continues,
replace
the
power
backplane.
Restart
the
server.
4.
If
the
error
continues,
(trained
service
technician
only)
replace
the
system
board.
5V
fault
1.
Remove
the
following
devices,
which
are
powered
by
5
volts:
v
All
PCI
adapters
v
USB
devices
v
CD-RW/DVD
drive
v
Tape
drive,
if
one
is
installed
v
Hard
disk
drive
backplane
2.
Reinstall
each
I/O
device
removed
in
step
1,
one
at
a
time,
restarting
the
server
each
time,
to
isolate
a
defective
device.
Replace
any
defective
device.
3.
If
the
error
continues,
replace
the
power
backplane.
Restart
the
server.
4.
If
the
error
continues,
(trained
service
technician
only)
replace
the
system
board.
+2.5V
critical
over
voltage
fault
Information
only.
+2.5V
critical
under
voltage
fault
Information
only.
+1.8V
critical
over
voltage
fault
Information
only.
Chapter
5.
Diagnostics
159