Power Problems - HP server rx4610 Service Manual

Chapter 5
8. Remove one accessory board at a time and reboot the HP Server. Verify the problem.
9. Once a suspect part has been found, verify that it is the problem by reinstalling the part and
duplicating the error.

Power Problems

Symptoms:
•
A fan is not working
•
The power LED does not light
To isolate and resolve the power outage, complete the following procedures:
1. Review the Troubleshooting Checklist before you continue.
2. Verify the AC power source is good:
a. If the HP Server fans are audible or a control panel light is on, the power is on.
b. Verify the circuit breaker for the AC power outlet.
c. If the breaker was off, check that all devices connected the HP Server share the same circuit
breaker and are the only devices on it. Reset the circuit breaker after reconfiguring the
devices, if need be.
d. Verify the AC power outlet is not faulty. Test it by plugging in a known-good device.
e. Verify the third-wire ground is isolated from other grounds and is at ground potential.
3. Verify all cable connections:
AC power cords from AC source outlet to server
◊ ◊ ◊ ◊
DC Power supply cables to all HP Server PCBs
◊ ◊ ◊ ◊
DC power supply cables to disk drives and/or mass storage cages
◊ ◊ ◊ ◊
4. If the fans aren't audible and the above steps are verified, check that power is getting to all fans.
Servers have multiple fans. All fans run when power is turned on; all are off when the power is
off.
5. With the power supply connected to the system board, check the power supply's voltages.
If voltages are not present:
a. Turn off AC power.
b. Disconnect the power cords for 5 minutes in order to reset the power supply's circuitry.
Turn on AC power again. If power is still not getting to the system board, replace the power
supply (or power supply module on some HP Server models).
6. If power is getting to the fan but the fan isn't working, replace the fan (or replace the power
supply in HP Server models with fans incorporated in the power supply).
7. If the problem continues, replace the power supply module.
8. If, after replacing the power supply, the problem persists:
a. Remove all accessory boards, including any hard disk drive controller board or the video
board the customer might have installed, and reboot the HP Server.
b. Disconnect all mass storage power cords and cables (except those to the boot device) and
reboot the HP Server.
9. If the problem goes away, reinstall the original suspected part to verify that it is causing the
problem.
Troubleshooting
65