System-board
switches
The
following
illustration
shows
the
SW4
switch
(Boot
block/Clear
CMOS)
on
the
system
board.
1
2
3
4
5
6
7
8
9
10
11
12
DIMM LEDs
SW4 (Boot block/Clear CMOS)
The
following
table
describes
the
function
of
each
pin
on
the
SW4
switch
(Boot
block/Clear
CMOS)
on
the
system
board.
Table
3.
System
board
SW4
switch
Switch
pin
number
Description
1
Boot
block:
v
When
this
switch
is
on
1
,
this
is
normal
mode.
v
When
this
switch
is
toggled
to
On
,
this
enables
the
system
to
recover
if
the
BIOS
code
becomes
damaged.
See
the
Problem
Determination
and
Service
Guide
for
information
about
recovering
from
a
BIOS
update
failure.
2
Clear
CMOS:
v
When
this
switch
is
on
2
,
this
is
normal
mode.
This
keeps
the
CMOS
data.
v
When
this
switch
is
toggled
to
On
,
this
clears
the
CMOS
data,
which
clears
the
power-on
password
and
administrator
password.
Chapter
2.
Installing
options
19
Summary of Contents for System x3400 Type 7975
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Page 126: ...112 System x3400 Types 7973 7974 7975 and 7976 User s Guide...
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Page 134: ...Part Number 44W2584 Printed in USA 1P P N 44W2584...
