IBM 8840 Hardware Maintenance Manual - Page 27

Power, supply, Light, diagnostics - specs

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Configuration/Setup Utility program so that you can change or delete the power-on password. You do not have to move the switch back to the default position after the password is overridden. Changing the position of this switch does not affect the administrator password. Power supply LEDs The ac and dc power LEDs on the power supply provide status information about the power supply. The following illustration shows the location of the ac and dc power LEDs. AC power LED (green) DC power LED (green) For more information about power supply LEDs, see "Power-supply LED errors" on page 99. Light path diagnostics Use light path diagnostics to diagnose system errors. The light path diagnostics panel is inside the light path diagnostics drawer, on the right front of the server. To access the light path diagnostics panel, slide the latch to the left on the front of the light path diagnostics drawer. The following illustration shows the controls and LEDs on the light path diagnostics panel. Light Path Diagnostics REMIND OVER SPEC PS1 PS2 CPU VRM CNFG MEM NMI S ERR SP DASD RAID FAN TEMP BRD PCI A PCI B PCI C To acknowledge a system error but not take immediate action, press the remind button and place light path diagnostics in remind mode. When the server is in remind mode, the system-error LED on the front of the server flashes. If a new failure occurs, the system-error LED is lit again. Chapter 3. Diagnostics 17

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Configuration/Setup
Utility
program
so
that
you
can
change
or
delete
the
power-on
password.
You
do
not
have
to
move
the
switch
back
to
the
default
position
after
the
password
is
overridden.
Changing
the
position
of
this
switch
does
not
affect
the
administrator
password.
Power
supply
LEDs
The
ac
and
dc
power
LEDs
on
the
power
supply
provide
status
information
about
the
power
supply.
The
following
illustration
shows
the
location
of
the
ac
and
dc
power
LEDs.
DC power
(green)
LED
AC power
(green)
LED
For
more
information
about
power
supply
LEDs,
see
“Power-supply
LED
errors”
on
page
99.
Light
path
diagnostics
Use
light
path
diagnostics
to
diagnose
system
errors.
The
light
path
diagnostics
panel
is
inside
the
light
path
diagnostics
drawer,
on
the
right
front
of
the
server.
To
access
the
light
path
diagnostics
panel,
slide
the
latch
to
the
left
on
the
front
of
the
light
path
diagnostics
drawer.
The
following
illustration
shows
the
controls
and
LEDs
on
the
light
path
diagnostics
panel.
PCI C
DASD
NMI
PCI A
PS1
SP
PCI B
PS2
CNFG
RAID
MEM
CPU
FAN
VRM
OVER SPEC
TEMP
BRD
REMIND
S ERR
Light Path
Diagnostics
To
acknowledge
a
system
error
but
not
take
immediate
action,
press
the
remind
button
and
place
light
path
diagnostics
in
remind
mode.
When
the
server
is
in
remind
mode,
the
system-error
LED
on
the
front
of
the
server
flashes.
If
a
new
failure
occurs,
the
system-error
LED
is
lit
again.
Chapter
3.
Diagnostics
17