IBM 8676 Hardware Maintenance Manual - Page 37

Light Path Diagnostics™

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Level 2 diagnostic LEDs The following illustration shows the error LEDs, light path button, and test LED on Light Path Diagnostics panel on the system board. See "Light Path Diagnostic panel system error LED" on page 82 for information on identifying problems using these LEDs. Light path button (SW1) Test LED (CR82) Light Path Diagnostics™ CPU VRM CNFG MEM SP PS TEMP FAN DASD PCI A PCI B PCI C NMI NON OPT If you remove the server from the rack and you are using the Light Path Diagnostics LEDs to diagnose a problem, you can press the Light Path button to light any LEDs that were lit before you unplugged the server. Recovering the BIOS code If the BIOS code has become damaged, such as from a power failure during a flash update, you can recover the BIOS code using the flash ROM page swap jumper (J38) and a BIOS flash diskette. Note: Use one of the following methods to obtain a BIOS flash diskette: v Use the ServerGuide program to make a BIOS flash diskette. v Download a BIOS flash diskette from the World Wide Web at http://www.ibm.com/pc/support. Chapter 3. Diagnostics 27

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Level 2
diagnostic LEDs
The
following
illustration
shows
the
error
LEDs,
light
path
button,
and
test
LED
on
Light
Path
Diagnostics
panel
on
the
system
board.
See
“Light
Path
Diagnostic
panel
system
error
LED”
on
page
82
for
information
on
identifying
problems
using
these
LEDs.
CPU
MEM
PCI A
PCI B
PCI C
VRM
CNFG
DASD
SP
PS
NON
OPT
NMI
TEMP
FAN
Light Path Diagnostics™
Light path
button (SW1)
Test LED
(CR82)
If
you
remove
the
server
from
the
rack
and
you
are
using
the
Light
Path
Diagnostics
LEDs
to
diagnose
a
problem,
you
can
press
the
Light
Path
button
to
light
any
LEDs
that
were
lit
before
you
unplugged
the
server.
Recovering
the
BIOS
code
If
the
BIOS
code
has
become
damaged,
such
as
from
a
power
failure
during
a
flash
update,
you
can
recover
the
BIOS
code
using
the
flash
ROM
page
swap
jumper
(J38)
and
a
BIOS
flash
diskette.
Note:
Use
one
of
the
following
methods
to
obtain
a
BIOS
flash
diskette:
v
Use
the
ServerGuide
program
to
make
a
BIOS
flash
diskette.
v
Download
a
BIOS
flash
diskette
from
the
World
Wide
Web
at
Chapter
3.
Diagnostics
27