IBM 8840 Hardware Maintenance Manual - Page 78

System-board, switches, jumpers

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System-board switches and jumpers The following illustration shows the switches and jumpers on the system board. Any switches or jumpers on the system board that are not shown in the illustration are reserved. See "Recovering the BIOS code" on page 18 for information about the boot block recovery jumper. System board switch block (SW2) SW2 ON 1 2 3 4 5 6 7 8 Boot block recovery jumper (J60) Table 7 describes the function of each switch on the switch block. Table 7. Switches 1-8 Switch number Default value 8 On 7 Off 6 Off 5 Off 4 Off 3 Off 2 Off Switch description Reserved. Reserved. Reserved. Reserved. Reserved. Reserved. Power-on password override. Changing the position of this switch bypasses the power-on password check the next time the server is turned on and starts the 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. 1 Off Changing the position of this switch does not affect the administrator password check if an administrator password is set. Power-on override. When toggled to On, this switch forces the power on, overriding the power-on button. Note: Before changing any switch settings or moving any jumpers, turn off the server; then, disconnect all power cords and external cables. (Review "Installation 68 xSeries 346 Types 8840 and 1880: Hardware Maintenance Manual and Troubleshooting Guide

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System-board
switches
and
jumpers
The
following
illustration
shows
the
switches
and
jumpers
on
the
system
board.
Any
switches
or
jumpers
on
the
system
board
that
are
not
shown
in
the
illustration
are
reserved.
See
“Recovering
the
BIOS
code”
on
page
18
for
information
about
the
boot
block
recovery
jumper.
Boot block
recovery jumper (J60)
System board
switch block
(SW2)
1
2
3
4
5
6
7
8
SW2
ON
Table
7
describes
the
function
of
each
switch
on
the
switch
block.
Table
7.
Switches
1-8
Switch
number
Default
value
Switch
description
8
On
Reserved.
7
Off
Reserved.
6
Off
Reserved.
5
Off
Reserved.
4
Off
Reserved.
3
Off
Reserved.
2
Off
Power-on
password
override.
Changing
the
position
of
this
switch
bypasses
the
power-on
password
check
the
next
time
the
server
is
turned
on
and
starts
the
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
check
if
an
administrator
password
is
set.
1
Off
Power-on
override.
When
toggled
to
On,
this
switch
forces
the
power
on,
overriding
the
power-on
button.
Note:
Before
changing
any
switch
settings
or
moving
any
jumpers,
turn
off
the
server;
then,
disconnect
all
power
cords
and
external
cables.
(Review
“Installation
68
xSeries
346
Types
8840
and
1880:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide