System-board switches and jumpers, System-board, Switches – IBM 4190 User Manual
Page 30: Jumpers
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System-board
switches
and
jumpers
The
following
illustration
shows
the
switches
and
jumpers
on
the
system
board.
Boot block
recovery jumper
Clear CMOS jumper
SAS/SATA
controller
card
The
following
illustration
identifies
the
pins
on
a
jumper
and
shows
the
location
of
pin
1.
3
2
1
Pin 1 mark
Table
2.
Switch
and
jumper
settings
Component
Settings
Clear
CMOS
jumper
(JP3)
v
Pins
1
and
2:
Keep
CMOS
data
(default)
v
Pins
2
and
3:
Clear
the
CMOS
data,
which
clears
the
power-on
password
and
administrator
password
Boot
block
jumper
(JP4)
v
Pins
1
and
2:
Normal
(default)
v
Pins
2
and
3:
Boot
from
boot
block
16
IBM
System
x3250
M2
Types
4190
and
4194:
User’s
Guide
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