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Intel Atom Series User’s Manual
Chapter 3 Jumpers & Headers Setup
3.1 Checking Jumper Settings
• 2-pin jumper: Plug the jumper cap onto both
pins will make it CLOSE (SHORT). Remove the
cap or plug it on another pins (keep for future
use) will activate the jumper.
• 3-pin jumper: Plug the jumper cap onto pin
1~2 or pin 2~3 will make it CLOSE (SHORT).
shorted by plugging the jumper cap in.
How to identify the PIN1?
Please check the Motherboard carefully, the PIN1
is marked by "1", white thick line or white triangle.
3.2 Unpluging the CMOS Header
When: (a) the CMOS data demaged, (b) you forgot the supervisor or password of BIOS,
(c) you are unable to boot-up because the frenquency of CPU was incorrectly, or (d) there
have modifications on CPU or memory modules, means you need to unplug the CMOS
header.
It uses a jumper cap to clear the CMOS setup, and reset the BIOS value to default.
• Pins 1 and 2 open circuit (Default): Normal situation
• Pins 2
and 3 shorted: Clear CMOS setup
To clear the CMOS setup and set to default values:
1. Power off the system.
2. Plug the jumper cap to pin 2-3, and wait for 3-5 seconds, then plug the cap back to pin
1-2.
3. Power on the system.
4. If the frequency of CPU set incorrect, please press the <Del> button to enter the BIOS
setup menu after powering on system.
5. Reset the running speed of CPU to default or to suitable value.
6. Save and exit the BIOS setup menu.
Default state
ClearCMOS
