Maintenance and Troubleshooting 4-9
TROUBLESHOOTING
This subsection provides information that helps isolate and repair system malfunctions at the
field level. Step-by-step instructions for diagnosing and solving system hardware problems
are provided.
If disassembly is required, see Section 5. Connector pin assignments are given in
Appendix A. Jumper settings are given in Appendix B.
Diagnosing and Solving Problems
One beep indicates that the system has completed its POST test. If intermittent beeping
occurs, power off the system and try again. If the beeping persists, see Table 4-2. The table
summarizes problems that may develop during system operation and lists (in sequential
order) suggested corrective actions.
Table 4-2 Problems and Solutions
Problem
Symptom
Solution
No power
Power lamp on computer
status panel does not light.
1.Check that the power cord is
plugged into the power socket on the
computer.
Check that the other end of the cord is
plugged into a live, properly grounded
AC power outlet.
2.Check cable connections between
the power supply and riser board and
between the riser board and power
switch.
3.Systematically eliminate possible
shorted PCBs by removing cables and
expansion boards.
4.Check the +5 and +12 power supply
voltages (see Appendix A, "Connector
Pin Assignments"). Measure voltages
with the system board installed.
5.Replace the power switch assembly.
6.Replace the power supply.
7.Replace the system board.