mP4G/mP4GL Series Motherboard

The BIOS-Related Jumper

Jumper JCMOS1: Clear CMOS Memory

JCMOS1 is a jumper switch, but it does not set a hardware configuration setting. The BIOS CMOS Setup Utility creates a system configuration record that is stored in CMOS memory in the real-time clock chip. If the configuration record data becomes corrupted or is destroyed, or if the CMOS Setup Utility settings are changed to an unusable configuration, the motherboard may not run properly or at all. JCMOS1 provides a means to delete the configuration data stored in CMOS memory and reset the configuration to the CMOS Setup Utility’s Optimized De- faults.

Follow this procedure to clear CMOS memory. If neces- sary, refer to the motherboard diagram and key in Chapter 2 for the jumper location.

1.Turn off and unplug the system. Remove the system housing cover (see documentation if necessary).

2.Set JCMOS1 to the Clear CMOS position by placing the jumper cap over pins 2 and 3 for one minute.

3.Return the jumper cap to the Normal position.

4.Replace the system housing cover, plug in the sys- tem and turn it on.

5.Run the CMOS Setup utility and load the Optimized Defaults. You can then enter any custom settings you require.

6.Save the settings as you exit the program and restart the computer.

The system should now operate normally.

JCMOS1: Clear CMOS Memory

Setting

 

Function

Short 1-2

 

 

Normal operation [Default]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Short 2-3

 

Clear CMOS memory – see instructions

 

 

 

 

 

 

 

 

 

3•2

User’s Manual