IBM 8688 ユーザーズマニュアル
6.
Locate
the
CMOS
recovery
jumper
(J19)
on
the
I/O
board.
The
following
illustration
shows
the
location
of
the
jumper
on
the
I/O
board.
1
2
3
CMOS recovery
jumper (J19)
jumper (J19)
7.
Move
the
CMOS
recovery
jumper
from
pins
1
and
2
to
pins
2
and
3.
8.
Wait
60
seconds;
then,
return
the
CMOS
recovery
jumper
to
pins
1
and
2.
9.
Replace
fans
3
and
4.
10.
Close
the
cover
(see
11.
Connect
the
server
to
a
power
source,
keyboard,
monitor,
and
mouse.
12.
Turn
on
the
server.
The
EFI
Boot
Manager
program
starts.
13.
Follow
the
instructions
to
erase
the
existing
password
or
create
a
new
password.
14.
Select
Save
Settings,
and
press
Enter.
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.
Follow
this
general
procedure
for
troubleshooting
power
problems:
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,
a
loose
screw
might
be
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
the
note
about
minimum
operating
requirements
on
page
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
up
from
the
minimal
configuration,
replace
FRUs
of
the
minimal
configuration
one
at
a
time
until
the
problem
is
isolated.
To
use
this
method,
it
is
important
to
know
the
minimum
configuration
required
for
a
system
to
start
(see
the
minimum
configuration
requirements
at
74
IBM
xSeries
450
Type
8688:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide