55
Chapter 4: Motherboard Connections
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 also clears all passwords. Do
not
use the PW_ON connector to clear
CMOS.
JBT1 contact pads
Watch Dog
Watch Dog (JWD1) is a system monitor that can reboot the system when a software
application hangs. Close pins 1-2 to reset the system if an application hangs. Close pins 2-3
to generate a non-maskable interrupt (NMI) signal for the application that hangs. Refer to the
table below for jumper settings. The Watch Dog must also be enabled in the BIOS.
Watch Dog
Jumper Settings
Jumper Setting
Definition
Pins 1-2
Reset
Pins 2-3
NMI
Open
Disabled
VGA Enable/Disable
Jumper JPG1 allows the user to enable the onboard VGA connector. The default setting is
pins 1-2 to enable the connection. Refer to the table below for jumper settings.
VGA Enable/Disable
Jumper Settings
Jumper Setting
Definition
Pins 1-2
Enabled
Pins 2-3
Disabled
