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84 Chapter 3—Diagnostics and Troubleshooting
3.4.8 General Power Checkout
Power problems can be difficult to troubleshoot. For instance, a short circuit can
exist anywhere on any of the power distribution buses. Usually a short circuit causes
the power subsystem to shut down because of an over-current condition.
A general procedure for troubleshooting power problems is as follows:
1. Turn off the system and disconnect the AC power cord(s).
2. Check for loose cables in the power subsystem. Also check for short circuits.
For example, 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 the system is at the minimum configuration
required for operation.
4. Reconnect the AC cord and turn on the system. If the system starts
successfully, replace adapters and devices one at a time until the problem is
isolated. If the system does not turn on from the minimal configuration, replace
FRUs of minimal configuration one at a time until the problem is isolated.
3.4.9 Temperature Checkout
Accurate cooling of the system is important for proper operation and system
reliability.
Confirm the following:
•
Each of the drive bays has either a drive or a filler panel installed.
•
The cover is in place during normal operation.
•
There is at least 50 mm (2 inches) of ventilated space at the sides of the IC-304
print controller and 127 mm (5 inches) of space around the front and rear of the
server.
•
The cover is removed for no longer than 30 minutes while the server is
operating.
•
The fans are operating correctly and the air flow is good.
•
A failed fan is replaced within 48 hours.
3.4.10 Error Messages
There are four types of error messages:
•
System
•
Hardware
•
Software
•
Connection
Each error message indicates a problem and sometimes also a recovery action. If the
problem is not resolved after performing the recovery action, perform a diagnostics
test and replace the problematic part.
The following tables contain examples of different error messages.