IBM 867282X Maintenance Manual - Page 24

Power checkout, Reconnect the AC cord and power on the server. If the server powers up

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Power checkout Power problems can be difficult to troubleshoot. For instance, a short circuit can exist anywhere on any of the power distribution busses. Usually a short circuit will cause the power subsystem to shut down because of an overcurrent condition. A general procedure for troubleshooting power problems is as follows: 1. Power off the server and disconnect the AC cord(s). 2. Check for loose cables in the power subsystem. Also check for short circuits, for instance if there is a loose screw causing a short circuit on a circuit board. 3. Remove adapters and disconnect the cables and power connectors to all internal and external devices until server is at minimum configuration required for power on (see ″Minimum operating requirements″ on page 70). 4. Reconnect the AC cord and power on the server. If the server powers up successfully, replace adapters and devices one at a time until the problem is isolated. If server does not power up from minimal configuration, replace FRUs of minimal configuration one at a time until the problem is isolated. To use this method it is important to know the minimum configuration required for a server to power up (see page 70). 16 Hardware Maintenance Manual: xSeries 300

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Power checkout
Power problems can be difficult to troubleshoot. For instance, a short circuit can
exist anywhere on any of the power distribution busses. Usually a short circuit will
cause the power subsystem to shut down because of an overcurrent condition.
A general procedure for troubleshooting power problems is as follows:
1.
Power off the server and disconnect the AC cord(s).
2.
Check for loose cables in the power subsystem. Also check for short circuits, for
instance if there is a loose screw causing a short circuit on a circuit board.
3.
Remove adapters and disconnect the cables and power connectors to all
internal and external devices until server is at minimum configuration required
for power on (see
″
Minimum operating requirements
″
on page 70).
4.
Reconnect the AC cord and power on the server. If the server powers up
successfully, replace adapters and devices one at a time until the problem is
isolated. If server does not power up from minimal configuration, replace FRUs
of minimal configuration one at a time until the problem is isolated.
To use this method it is important to know the minimum configuration required
for a server to power up (see page 70).
16
Hardware Maintenance Manual: xSeries 300