IBM x3655 Service Guide - Page 32

Notes - review

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Table 2 describes the function of the jumpers on the system board. Table 2. System Board Jumpers Jumper number Jumper description J33 Wake on LAN: The default position is pins 1 and 2. Change the position of this jumper to pins 2 and 3 to prevent a Wake on LAN packet from waking the system when the system is in the power-off state. J35 BIOS recovery: The default position is pins 1 and 2 (use the primary page during startup). Move the jumper to pins 2 and 3 to use the secondary page during startup (see "Recovering the BIOS code" on page 156 for additional information about BIOS recovery mode). J37 Power-on password: The default position is pins 1 and 2. Changing the position of this jumper to pins 2 and 3 bypasses the power-on password check the next time the server is turned on and starts the Configuration/Setup Utility so that you can change or delete the power-on password. Changing the position of this jumper does not affect the administrator password check if an administrator password is set. If you forget the administrator password, you must replace the system board. Notes: 1. Before moving any jumpers, turn off the server; then, disconnect all power cords and external cables. (Review the information in "Safety" on page vii, "Installation guidelines" on page 35, and "Handling static-sensitive devices" on page 37.) 2. Any system-board jumper blocks that are not shown in the illustrations in this document are reserved. 14 IBM System x3655 Type 7985: Problem Determination and Service Guide

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Table
2
describes
the
function
of
the
jumpers
on
the
system
board.
Table
2.
System
Board
Jumpers
Jumper
number
Jumper
description
J33
Wake
on
LAN
:
The
default
position
is
pins
1
and
2.
Change
the
position
of
this
jumper
to
pins
2
and
3
to
prevent
a
Wake
on
LAN
packet
from
waking
the
system
when
the
system
is
in
the
power-off
state.
J35
BIOS
recovery
:
The
default
position
is
pins
1
and
2
(use
the
primary
page
during
startup).
Move
the
jumper
to
pins
2
and
3
to
use
the
secondary
page
during
startup
(see
“Recovering
the
BIOS
code”
on
page
156
for
additional
information
about
BIOS
recovery
mode).
J37
Power-on
password
:
The
default
position
is
pins
1
and
2.
Changing
the
position
of
this
jumper
to
pins
2
and
3
bypasses
the
power-on
password
check
the
next
time
the
server
is
turned
on
and
starts
the
Configuration/Setup
Utility
so
that
you
can
change
or
delete
the
power-on
password.
Changing
the
position
of
this
jumper
does
not
affect
the
administrator
password
check
if
an
administrator
password
is
set.
If
you
forget
the
administrator
password,
you
must
replace
the
system
board.
Notes:
1.
Before
moving
any
jumpers,
turn
off
the
server;
then,
disconnect
all
power
cords
and
external
cables.
(Review
the
information
in
“Safety”
on
page
vii,
“Installation
guidelines”
on
page
35,
and
“Handling
static-sensitive
devices”
on
page
37.)
2.
Any
system-board
jumper
blocks
that
are
not
shown
in
the
illustrations
in
this
document
are
reserved.
14
IBM
System
x3655
Type
7985:
Problem
Determination
and
Service
Guide