Power Supply Verification
To power on, the server's logic board requires a "trickle" power of +5V. If the system fails to power on, first reset the PMU. Then follow the procedure outlined below to determine whether the problem is related to the power supply.
Note: To verify the power supply, you need a volt meter. When connecting the volt meter leads to specific pins, make sure the power supply remains securely plugged into its connector on the logic board.
The following figure shows the pins and voltage on the server's power supply connector, as viewed from above when it is connected to the logic board.
|
Pin |
1 |
+12VDC |
□ |
□ |
+12VDC |
Pin |
13 |
|
Pin |
2 |
GND |
□ |
□ |
GND |
Pin |
14 |
|
Pin |
3 |
+12VDC |
□ |
□ |
GND |
Pin |
15 |
|
Pin |
4 |
+5VDC |
□ |
□ |
GND |
Pin |
16 |
|
Pin |
5 |
+5VDC |
□ |
□ |
GND |
Pin |
17 |
|
Pin |
6 |
+5VDC |
□ |
□ |
GND |
Pin |
18 |
|
Pin |
7 |
+3.3VDC |
□ |
□ |
GND |
Pin |
19 |
|
Pin |
8 |
+3.3VDC |
□ |
□ |
GND |
Pin |
20 |
|
Pin |
9 |
+3.3VDC |
□ |
□ |
GND |
Pin |
21 |
|
Pin |
10 |
-12VDC |
□ |
□ |
GND |
Pin |
22 |
|
Pin |
11 |
Power On |
□ |
□ |
GND |
Pin |
23 |
|
Pin |
12 |
+5VSB |
□ |
□ |
GND |
Pin |
24 |
- Plug a known-good power cord into the server. Do not turn on the server.
- Connect the black lead of the volt meter to pin 14 of the power supply connector; connect the red lead of the volt meter to pin 1. The volt meter should measure approximately +12V.
If you do not get a reading of +12V, recheck the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply.
If you do measure +12V on pin 1, the power supply is likely OK. Go to the next step for further verification.
3. Start up the server by pressing the power button on the front panel.
If the server starts up normally, the power supply is OK. If the server does not start up, go to the next step.
4. Check to see if the power supply fan is spinning.
If the fan spins, the power supply is OK. If the fan does not spin, go to the next step.
5. Connect the black lead of the volt meter to pin 14 of the power supply connector; connect the red lead to pin 9. The volt meter should measure approximately +3.3V.
If you do not get a reading of +3.3V, recheck the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply.
If you do measure +3.3V on pin 9, the power supply is likely OK. Go to the next step for further verification.
6. Connect the black lead of the volt meter to pin 14 of the power supply connector; connect the red lead to pin 4. The volt meter should measure approximately +5V.
If you do not get a reading of +5V, recheck the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply.
If you do measure +5V on pin 4, the power supply is likely OK. Go to the next step for further verification.
7. Connect the black lead of the volt meter to pin 14 of the power supply connector; connect the red lead to pin 3. The volt meter should measure approximately +12V.
If you do not get a reading of +12V, recheck the volt meter connections and measure the voltage again. If voltage is still not present, replace the power supply.
If you do measure +12V on pin 3, the power supply is OK and the testing is complete. You have verified that the power supply is not the cause of the "no apparent power" symptom.
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