H8DCE User's Manual Power Supply Fail Alarm Reset The system will notify you in the event of a power supply failure. This feature assumes that Supermicro redundant power supply units are installed in the chassis. Attach a microswitch to this header to turn off the power fail alarm. See the table on the right for jumper settings. 2-7 Jumper Settings Explanation of Jumpers To modify the operation of the serverboard, jumpers can be used Connector Pins 3 2 1 to choose between optional settings. Jumpers create shorts between two pins to change the function of the Jumper connector. Pin 1 is identifi ed with a square solder pad on the printed cir- cuit board.
See the diagram at right 3 2 1 for an example of jumping pins 1 and 2. Refer to the serverboard layout page for jumper locations. Setting Note 1: On two-pin jumpers, "Closed" means the jumper is on and "Open" means the jumper is off the pins. 2-16 Power Supply Fail Alarm Reset Pin Defi nitions (JAR) Pin# Defi nition 2 +5V 1 Ground