IBM 8676 Hardware Maintenance Manual - Page 38

Power, checkout

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Page 38 highlights

The flash memory of the server consists of a primary page and a backup page. The J38 jumper controls which page is used to start the server. If the BIOS code in the primary page is damaged, you can use the backup page to start the server; then, start the BIOS flash diskette to restore the BIOS code to the primary page. Complete the following steps to recover the BIOS code: 1. Turn off the server and peripheral devices and disconnect all power cords and external cables; then, remove the cover. 2. Locate jumper J38 (flash-ROM page swap) on the system board. Flash ROM jumper (J38) 3. Move the jumper to pins 2 and 3 to enable BIOS recovery mode. 4. Reconnect all external cables and power cords and turn on the peripheral devices. 5. Insert the BIOS flash diskette into the diskette drive and restart the server. The system begins the power-on self-test (POST). 6. The Flash Update Utility program displays the Flash Update Menu. Select 1 - Update POST/BIOS. 7. When prompted as to whether you want to save the current code to a diskette, press N. 8. When prompted to choose a language, select a language (from 0 to 7) and press Enter to accept your choice. 9. Attention: Do not restart the server at this time. Remove the flash diskette from the diskette drive. 10. Turn off the server. 11. Move the jumper on J38 to pins 1 and 2 to return to normal startup mode. 12. Replace the cover and restart the server. The system should start up normally. 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. A general procedure for troubleshooting power problems is as follows: 28 xSeries 335 Type 8676, Type 8830: Hardware Maintenance Manual and Troubleshooting Guide

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The
flash
memory
of
the
server
consists
of
a
primary
page
and
a
backup
page.
The
J38
jumper
controls
which
page
is
used
to
start
the
server.
If
the
BIOS
code
in
the
primary
page
is
damaged,
you
can
use
the
backup
page
to
start
the
server;
then,
start
the
BIOS
flash
diskette
to
restore
the
BIOS
code
to
the
primary
page.
Complete
the
following
steps
to
recover
the
BIOS
code:
1.
Turn
off
the
server
and
peripheral
devices
and
disconnect
all
power
cords
and
external
cables;
then,
remove
the
cover.
2.
Locate
jumper
J38
(flash-ROM
page
swap)
on
the
system
board.
Flash ROM
jumper (J38)
3.
Move
the
jumper
to
pins
2
and
3
to
enable
BIOS
recovery
mode.
4.
Reconnect
all
external
cables
and
power
cords
and
turn
on
the
peripheral
devices.
5.
Insert
the
BIOS
flash
diskette
into
the
diskette
drive
and
restart
the
server.
The
system
begins
the
power-on
self-test
(POST).
6.
The
Flash
Update
Utility
program
displays
the
Flash
Update
Menu.
Select
1
-
Update
POST/BIOS
.
7.
When
prompted
as
to
whether
you
want
to
save
the
current
code
to
a
diskette,
press
N.
8.
When
prompted
to
choose
a
language,
select
a
language
(from
0
to
7)
and
press
Enter
to
accept
your
choice.
9.
Attention:
Do
not
restart
the
server
at
this
time.
Remove
the
flash
diskette
from
the
diskette
drive.
10.
Turn
off
the
server.
11.
Move
the
jumper
on
J38
to
pins
1
and
2
to
return
to
normal
startup
mode.
12.
Replace
the
cover
and
restart
the
server.
The
system
should
start
up
normally.
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.
A
general
procedure
for
troubleshooting
power
problems
is
as
follows:
28
xSeries
335
Type
8676,
Type
8830:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide