Chapter 2
7
2-5 Connector and Jumper Settings
Connectors are used to link the system board with other parts of the system, including
the power supply, the keyboard, and the various controllers on the front panel of the
system case.
The power supply connector is the last connection to be made while installing a
motherboard. Before connecting the power supply, please make sure it is not
connected to the power source.
Note
:
All cables are
security-proof
.
PW1 (ATX Power Supply Connector)
The power cord leading from the system's power supply to the external power source
must be the very last part connected when assembling a system. The ATX power
supply provides a single 20-pin connector interface, which incorporates st/-5V,
+/-12V, optional 3.3V and soft-power signals. The soft-power signal, a 5V trickle
supply is continuously supplied when AC power is available. When the system is in the
Soft-Off mode, this trickle supply maintains the system in its minimum power state.
Power-On By Modem
While in Soft-Off state, if an external modem ring-up signal occurs, the system wakes
up and can be remotely accessed. You may enable this function in BIOS's Power
Management Setup menu. (See section
3.5
)
Blinking LED in Suspend Mode
While in Suspend mode, the LED light on the front panel of your computer will flash.
Suspend mode is entered by pressing the Override Power Button, pushing the Green
button on your ATX case, or enabling the Power Management and Suspend Mode
options in BIOS's Power Management menu. (See section
3.5
)
Poly-fuse Over Current Protection
The poly-fuse protects the system from dangerous voltages that the system might be
exposed to via the keyboard or USB connector. In case of such exposure, the poly-fuse
will immediately be disconnected from the circuit, just like a normal fuse. After being
disconnected for a certain period of time, the poly-fuse will return to its normal state.
Then the keyboard or USB connector can function properly again. Unlike conventional
fuses, the poly-fuse does not have to be replaced, relieving the user wasted time and
inconvenience.
Chapter 2
8
CN1A (Front Panel Connector) A through F
A. PWR-SW (Over-ride Power Button Connector)
The power button on the ATX chassis can be used as a normal power switch as well
as a device to activate Advanced Power Management Suspend mode. This mode is
used for saving electricity when the computer is not in use for long periods of time.
The Soft-OFF by PWR-BTN function in BIOS's Power Management Setup menu
must be set to [
Delay 4 Sec
.] to activate this function.
When the Soft-OFF by PWR-BTN function is enabled, pushing the power button
rapidly will switch the system to Suspend mode. Any occurrence of external
activities such as pressing a key on the keyboard or moving the mouse will bring the
system back to Full-On. Pushing the button while in Full-On mode for more than [
4
seconds
] will switch the system completely off. See Over-ride Power Button
Operation diagram.
B. P-LED (Power LED Connector)
The power indicator LED shows the system's power status. It is important to pay
attention to the correct cables and pin orientation (i.e., not to reverse the order of these
two connectors.)
C. G-BTN/G-LED (Green Button Switch/LED Connector)
Some ATX cases provide a Green button switch, which is used to put the system in
Suspend mode. In Suspend mode, the power supply to the system is reduced to a
trickle, the CPU clock is stopped, and the CPU core is in its minimum power state.
The system is woken up whenever the keyboard or mouse is touched. The system
resumes in different ways as defined by Power Management Setup screen in BIOS.
D. RESET (System Reset Switch Connector)
This connector should be connected to the reset switch on the front panel of the
system case. The reset switch allows you to restart the system without turning the
power off.
E. SPEAKER (Speaker Connector)
This 4-pin connector connects to the case-mounted speaker
F. HD-LED (IDE Activity LED Connector)
The IDE activity LED lights up whenever the system reads/writes to the IDE
devices.
