Troubleshooting; Diagnosing And Solving Problems - NEC POWERMATE ENTERPRISE NETPC Service Manual

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.
Problem
No power
Table 4-2 Problems and Solutions
Symptom
Power lamp on computer
status panel does not light.
Maintenance and Troubleshooting
Solution
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 card.
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 supply.
6. Replace the system board.
4-9