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VB9001 User Manual
4.1 Clear CMOS Jumper
The VB9001 comes with a Clear CMOS jumper. The onboard CMOS RAM stores system configuration data and
has an onboard battery power supply. To reset the CMOS settings, set the jumper on pins 2 and 3 while the
system is off, then return the jumper to pins 1 and 2 afterwards. Setting the jumper while the system is on will
damage the mainboard. The default settings are on pins 1 and 2.
Figure 26: Clear CMOS jumper diagram
Table 17:
Clear CMOS jumper settings
Note:
Except when clearing the RTC RAM, never remove the cap from the CLEAR_CMOS jumper default position.
Removing the cap will cause system boot failure. Avoid clearing the CMOS while the system is on; it will damage the
mainboard.
Setting
Pin 1 Pin 2 Pin 3
Normal
Short Short Open
Clear CMOS Open Short Short
1
CMOS1
1
