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-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. Click here for pinouts. |
| 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 |