Mainboard KM51G-754
12
The following steps explain how to reset your CMOS configurations
when you forgot a system password.
Case Open Warning Header: JCI1
This header is used to warn the user when the computer case has been previously opened. To
use this function, you have to enable the CASE OPEN warning function in the BIOS Setup
Utility. When your computer case is opened, your system will show alert messages during the
boot up. To use this function, your computer case must be equipped with a “case open” cable.
Pin
Assignment
1
Case open signal
JCI1
2 Ground
USB Power Selection Header: JUSBV1/JUSBV2
USB devices attached to the back panel USB ports can awaken the system from sleep mode.
In order to enable this functionality, you must adjust the jumper caps on JUSBV1/JUSBV2
header for +5V or +5VSB mode depending on which USB port that the USB device is attached
to.
JUSBV1/JUSBV2
Assignment
Description
1
Pin 1-2 Close
+5V
JUSBV1:
+5V for JUSB1and
JUSBLAN1.
JUSBV2:
+5V for JUSB2 and JUSB3.
1
Pin 2-3 Close
+5V Standby
Voltage
JUSBV1:
JUSB1 and JUSBLAN1are
powered with +5V standby
voltage.
JUSBV2:
JUSB2 and JUSB3 are
powered with +5V standby
voltage.
Note:
Close stands for putting a jumper cap onto two header pins.
Clear CMOS Jumper: JCMOS1
The “Clear CMOS” function is used when you are unable boot your system and need to reset
the BIOS settings (CMOS settings) back to the manufacturer’s original settings. This is also a
way to reset the system password if you have forgotten it.
JCMOS1
Assignment
Pin 1-2 Close
Normal (Defult)
Pin 2-3 Close
Clear CMOS Data
Note:
Close stands for putting a jumper cap onto two header pins.
1. Turn off your system and disconnect the AC power cable.
2. Set JCMOS1 header to OFF (2-3 Closed).
3. Wait several seconds.
4. Set JCMOS1 header to ON (1-2 closed).
5. Connect the AC power cable and turn on your system.
6. Reset your new password.
