4-10 Troubleshooting and Repair
TROUBLESHOOTING
This subsection provides information that helps isolate and repair computer malfunctions at
the field level. Step-by-step instructions on diagnosing and solving computer hardware
problems are provided.
If disassembly is required, see Sections 5 and 6. Connector pin assignments are explained
in the Appendix B. Jumper settings are explained in Section 2.
Diagnosing and Solving Problems
One beep indicates that the computer has completed its power-on self-test. If intermittent
beeping occurs, power off the computer and try again. If the beeping persists, see
Table Section 4-5. Table Section 4-3 summarizes problems that may develop during com-
puter operation and lists (in sequential order) suggested corrective actions.
Table Section 4-3 Problems and Solutions
Problem
Symptom
Solution
No power
Power lamp on computer status
panel will not light.
1
. Check that the power cord is
plugged into the AC connector 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
power supply and system board.
3
. Systematically eliminate possibly
shorted PCBs by removing cables and
expansion boards.
4
. Check the +5 and +12 power supply
voltages (see Appendix B, Connector
Pin Assignments). Measure voltages
with the system board installed.
5
. Replace power supply.
6
. Replace system board.