Chapter 2: Installation Overheat LED Connect an LED to the JOH1 header to provide warning of chassis overheating. See the table on the right for pin defi nitions. Power LED/Speaker On the JD1 header, pins 1~3 are used for power LED indication, and pins 4-7 are for the speaker. See the tables on the right for pin defi nitions. If you wish to use the onboard speaker, you should close pins 6~7 with a jumper. Connect a cable to pins 4~7 of JD1 to use an external speaker. Unit Identifi er Button There is a Unit Identifi er (UID) button on the rear I/O of the board. There is another UID button located on the control panel.
When you push either UID button, both Rear UID and Front Panel UID Indicators will illuminate. Push either button again to turn off both indicators. These UID indicators provide easy identifi cation of a system unit that may be in need of service. Compact Flash Card PWR Connector A Compact Flash Card Power Connector is located at JWF1.
2-19 Overheat LED Pin Defi nitions (JOH1) Pin# Defi nition 1 3.3V 2 OH Active PWR LED Connector Pin Defi nitions (JD1) Pin Setting Defi nition Pin 1 Anode (+) Pin2 Cathode (-) Pin3 NA Speaker Connector Pin Defi nitions Pin Setting Defi nition Pins 4~7 External Speaker Pins 6~7 Internal Speaker UID Button Pin Defi nitions Pin# Defi nition 1 Ground 2 Ground 3 Button In 4 Ground