Power Problems - HP netserver e 800 Service Manual

Chapter 5
b. Remove the system board, install a known good memory module, and reboot. If you still
receive an error, replace the system board.
If the error goes away, add another module and reboot again. Continue this process until you
have installed all memory modules or you experience a failure. Replace the defective
module(s).
8. Remove one accessory board at a time and reboot the NetServer. 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
1. Review the Troubleshooting Checklist before you continue.
2. Verify the AC power source is good:
a. If the NetServer 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 NetServer 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 NetServer 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.
HP NetServers have multiple fans. All fans run when power is turned on; all are off when the
power is off.
With the power supply connected to the system board, check the power supply's voltages.
5. 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 NetServer models).
6. If power is getting to the fan but the fan isn't working, replace the fan (or replace the power
supply in NetServer models with fans incorporated in the power supply).
7. If the problem continues, replace the power supply module.
50
Troubleshooting