Technical Product Specification

Intel Desktop Board DX79SR Technical Product Specification

1.13.2.10 Power Supervisor

The Power Supervisor actively monitors the input voltages from the power supply and

protects the board and any attached peripherals from electrical overstress and possible

physical damage. The Power Supervisor will activate if it detects the power supply

voltage rails have deviated outside the current ATX power supply specification and safe

operating levels.

If the Power Supervisor detects an out of spec voltage, the following will happen:

1. The board will be powered down immediately to protect circuits from electrical

overstress and possible physical damage.

2. A red warning LED on the board will activate as a visual cue.

3. During the next power on, a message will be displayed on the screen to notify the

user that the power supply voltage rails have deviated outside the current ATX

power supply specification and safe operating levels.

4. A message will be added to the BIOS Event Log for each event that takes place

until the BIOS Event Log is cleared.

1.13.2.11 +5 V Standby Power Indicator LED

The +5 V standby power indicator LED shows that power is still present even when the

computer appears to be off.

1.14 Board Status LEDs

The Desktop Board provides eight board status LEDs that allow you to monitor the

board’s progress through the BIOS Power-on Self-Test. At initial power on, all the

LEDs are off. When the BIOS starts an activity such as memory initialization, the

corresponding LED starts flashing. Once the activity has completed, the LED will

remain on. Six additional LEDs can be used to monitor board functions such as hard

drive activity, processor errors, and power faults. Refer to Table 9 for a description of

all of the LEDs. Figure 8 shows the location of the LEDs.