DP400 Motherboard
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User’s Manual
3•4
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Jumper JP6: Clear CMOS Memory
JP6 is a jumper switch, but it does not set a hardware
configuration setting. The BIOS CMOS Setup Utility cre-
ates 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. JP6 provides a means to delete the configuration
data stored in CMOS memory and reset the configuration
to the CMOS Setup Utility’s Optimized Defaults.
JP6: Clear CMOS Memory
Setting Function
Short 1-2 Normal operation [Default]
Short 2-3 Clear CMOS memory – see instructions
Follow this procedure to clear CMOS memory. The jumper
is beside the coin battery. If necessary, refer to the board
diagram and key in Chapter 2 for the location of the JP6
jumper.
1. Turn off and unplug the system. Remove the system
housing cover (see documentation if necessary).
2. Set JP6 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.
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