The 300-Watt power supply provides six regulated outputs to the system: +3.3V, +5.0V, +12.0V, -5.0V, -12.0V, and +5VSB (See power pinouts). An output signal, POK_H, is asserted when the +5V output exceeds an undervoltage threshold. A DC remote ON/OFF signal pin is used to enable or disable all the outputs except +5VSB. The power supply contains one 80-mm DC fan.
NOTE: When powering off the system, ensure that it remains off for at least 45 seconds before you reapply power.
| Symptom | Check |
|---|---|
| Power indicator is OFF. | Front-panel power switch was not pressed. Power at wall receptacle. AC cord. Voltage selection switch. |
| Power indicator is ON for a few seconds and then goes OFF. | There are three fans in the a/au-Series system: two are at the front of the system (one near the 21164 CPU and one near the expansion cards), and one is in the power supply. CAUTION: The power supply shuts OFF within 1 second if its internal fan fails. |
| Power indicator is ON, and the display monitor is blank. | Monitor power indicator is ON. Raster present if brightness is turned up. Fuses and circuit breakers. Video controller cable is properly connected. Power is present at system board. |
| Power Supply Connector |
Pin Number | Wire Color | Voltage |
|---|---|---|---|
| P10 and P11 Disk Drives |
1 2 3 4 |
Red Black Black Blue |
+5V Common Common +12V |
| P12, P13, P14, P15, and P16 Disk Drives |
1 2 3 4 |
Blue Black Black Red |
+12V Common Common +5V |
| P1 Riser Card | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
Brown Brown Black Red Black Red Black White Purple Blue Brown Yellow Black Green Black Black Black Gray Red Red |
+3.3V Sense +3.3V Common +5V Common +5V Common POK_H +5VSB +12V +3.3V -12V Common DC_ENABLE Common Common Common -5V +5V +5V Sense |
| P2 Riser Card | 1 2 3 4 5 6 7 8 9 10 |
Green Black Black Brown Brown Green Black Red Red Red |
Jumper (to pin 6) Common Common +3.3V +3.3V Jumper (to pin 1) Common +5V +5V +5V |