Power Problems - IBM totalstorage 326 User Reference

Table 9. Engine troubleshooting symptoms and actions (continued)
Error Symptom
Monitor problems (general).
Fixed disk diagnostic does not recognize
drives. Test shows fewer drives than are
actually installed.
Fixed disk diagnostic freezes when run.

Power problems

Power problems can be difficult to troubleshoot. For example, a short circuit can
exist anywhere on any of the power distribution busses. Usually a short circuit
causes the power subsystem to shut down because of an overcurrent condition.
Table 10 lists the power error messages that you might encounter.
A general procedure for troubleshooting power problems is as follows:
1. Power off the system and disconnect the AC cord(s).
2. Check for loose cables in the power subsystem. Also check for short circuits, for
3. Remove adapters and disconnect the cables and power connectors to all
4. Reconnect the AC cord and power on the Model 326 engine. If the engine
Table 10. Power error messages
Message
Power supply X current share fault
(level-critical; excessive current demand on
power supply X)
Power supply X DC good fault
(level-critical; power good signal not detected
for power supply X)
Power supply X temperature fault
Power supply X removed
CRU/action
Note: Some monitors have their own self-tests. If you suspect a problem
with the monitor, refer to the information that comes with the monitor for
adjusting and testing instructions.Suggested action:
1. Monitor.
2. Run video diagnostics.
Note: If the diagnostics complete successfully, the problem might be
a video driver.
3. Display adapter/system board.
Remove first drive that does not appear and rerun diagnostic. If the
remaining drives show up, replace the removed drive.
Remove the drive being tested at the time of the freeze and rerun the
diagnostic. If the diagnostic completes successfully, replace the removed
drive.
Attention: Note the special considerations when powering off and powering
on the Model 326 engine. See "Powering off and powering on the Model 326"
on page 49 for details.
example, if there is a loose screw causing a short circuit on a circuit board.
internal and external devices until the Model 326 engine is at minimum
configuration required for power on.
powers up successfully, replace adapters and devices one at a time until the
problem is isolated. If the engine does not power up from minimal configuration,
replace FRUs of minimal configuration one at a time until the problem is
isolated.
Action
1. See "Power problems"
1. Replace power supply X
1. Replace fan X
1. No action required - information only
Chapter 8. Troubleshooting
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