51
50
Chapter 4: Motherboard Connections
SuperServer 1019S-MC0T User's Manual
4.4 Jumpers
Explanation of Jumpers
To modify the operation of the motherboard, jumpers are used to choose between optional
settings. Jumpers create shorts between two pins to change the function associated with it.
Pin 1 is identified with a square solder pad on the printed circuit board. See the motherboard
layout page for jumper locations.
Note:
On a two-pin jumper, "Closed" means the jumper is on both pins and "Open" indicates
the jumper is either on only one pin or has been completely removed.
Connector
Pins
Jumper
Setting
3 2 1
3 2 1
CMOS Clear
JBT1 is used to clear CMOS, which will also clear any passwords. Instead of pins, this jumper
consists of contact pads to prevent accidentally clearing the contents of CMOS.
To Clear CMOS
1. First power down the system and unplug the power cord(s).
2. Remove the cover of the chassis to access the motherboard.
3. Remove the onboard battery from the motherboard.
4.
Short the CMOS pads with a metal object such as a small screwdriver for at least four
seconds.
5. Remove the screwdriver (or shorting device).
6. Replace the cover, reconnect the power cord(s) and power on the system.
Notes:
Clearing CMOS will also clear all passwords.
Do not use the PW_ON connector to clear CMOS.
JBT1 contact pads
VGA Enable/Disable
JPG1 allows you to enable or disable the VGA port using the onboard graphics controller.
The default setting is Enabled.
VGA Enable/Disable
Jumper Settings
Jumper Setting
Definition
Pins 1-2
Enabled
Pins 2-3
Disabled
10Gb LAN Enable/Disable
JPTG1 allows you to enable or disable the 10Gb LAN. The default setting is Enabled.
10Gb LAN Enable/Disable
Jumper Settings
Jumper Setting
Definition
Pins 1-2
Enabled
Pins 2-3
Disabled
BIOS Recovery
Close pins 2 and 3 of jumper JBR1 for BIOS recovery. The default setting is on pins 1 and 2
for normal operation. See the table below for jumper settings. The default setting is Normal.
BIOS Recovery
Jumper Settings
Jumper Setting
Definition
Pins 1-2
Normal
Pins 2-3
BIOS Recovery
Watch Dog
JWD1 controls the Watch Dog function. Watch Dog is a monitor that can reboot the system
when a software application hangs. Jumping pins 1-2 will cause Watch Dog to reset the
system if an application hangs. Jumping pins 2-3 will generate a non-maskable interrupt
signal for the application that hangs. Watch Dog must also be enabled in BIOS. The default
setting is Reset.
Note:
When Watch Dog is enabled, the user needs to write their own application software
to disable it.
Watch Dog
Jumper Settings
Jumper Setting
Definition
Pins 1-2
Reset
Pins 2-3
NMI
Open
Disabled
