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5-9
Jumper Settings
Explanation of
Jumpers
To modify the operation of the
motherboard, jumpers can be used
to choose between optional set-
tings.
Jumpers create shorts be-
tween two pins to change the
function of the connector. Pin 1 is
identified with a square solder pad
on the printed circuit board.
the motherboard layout pages for
jumper locations.
Note:
On
a
"Closed" means the jumper is on
both pins and "Open" means the
jumper is either on only one pin or
completely removed.
CMOS Clear
JBT1 is used to clear CMOS (which will also clear any passwords). Instead of
pins, this jumper consists of contact pads to prevent accidentally clearing the
contents of CMOS.
To clear CMOS, 1) First unplug the power cord(s) 2) With the power disconnected,
short the CMOS pads with a metal object such as a small screwdriver 3) Remove
the screwdriver (or shorting device) 4) Reconnect the power cord(s) and power on the
system.
Note: Do not use the PW_ON connector to clear CMOS.
Chassis/Overheat Fan
Select
JP3 allows you to select between
use of the Chassis fan and the
Overheat fan.
is open (Overheat fan).
jumper setting forces the chassis
fan to always be on. See the table
on the right for jumper settings.
See
two-pin
jumper,
The default position
A closed
Chapter 5: Advanced Motherboard Setup
Connector
Chassis/Overheat Fan
Select Jumper Settings
Jumper
Position
Open
Closed
5-17
Pins
3
2
1
Jumper
Cap
3
2
1
Setting
Pin 1-2 short
(JP3)
Definition
Chasis Fan
Overheat Fan
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