I-S71
3
1.4 Checking Jumper Settings
For a 2-pin jumper, plug the jumper cap on both pins will make it
CLOSE (SHORT). Remove the jumper cap, or plug it on either pin
(reserved for future use) will leave it at OPEN position.
SHORT
OPEN
OPEN
For a 3-pin jumper, pin 1~2 or pin 2~3 can be shorted by plugging the
jumper cap in.
Pin 1~2 SHORT
Pin 2~3 SHORT
1.4.1 CMOS Memory Clearing Header and Backup
Battery
The time to clear the CMOS memory occurs when (a) the CMOS data
becomes corrupted, (b) you forgot the supervisor or user password
preset in the BIOS menu, (c) you are unable to boot-up the system
because the CPU ratio/clock was incorrectly set in the BIOS menu, or (d)
whenever there is modification on the CPU or memory modules.
This header uses a jumper cap to clear the CMOS memory and have it
reconfigured to the default values stored in BIOS.
•
Pin-2 and pin-3 shorted (Default):
Normal operation.
•
Pin-1 and pin-2 shorted:
Clear CMOS memory.
To clear the CMOS memory and load in the default values:
1. Power off the system.
2. Set pin-1 and pin-2 shorted by the jumper cap. Wait for a few
seconds. Set the jumper cap back to its default settings --- pin-2
and pin-3 shorted.
3. Power on the system.
4. For incorrect CPU ratio/clock settings in the BIOS, press <Del> key
to enter the BIOS setup menu right after powering on system.
5. Set the CPU operating speed back to its default or an appropriate
value.
6. Save and exit the BIOS setup menu.
CMOS Backup Battery:
An onboard battery saves the CMOS memory to keep the BIOS
information stays on even after disconnected your system with power
source. Nevertheless, this backup battery exhausts after some five
years. Once the error message like “
CMOS BATTERY HAS FAILED
”
or “
CMOS checksum error
” displays on monitor, this backup battery
is no longer functional and has to be renewed.
