Troubleshooting
Overview
Troubleshooting is the process of isolating and diagnosing
problems with the system. When the system does not operate
as described in the VAXstation 4000 Model 90 Owner’s Guide (EK-
PVAX2-OM), use the information in this section to help diagnose
the problem.
If the power-up tests complete, you can use the console error
messages to identify the failed FRU, or you can run the self-
test, system test, and utility tests in Digital Services mode to
help isolate the failing FRU. The console error messages are
interpreted in Appendix A.
Use the diagnostic LEDs (listed in Appendix B) on the front of the
system to help diagnose problems when the system is unable to
set up the console.
The troubleshooting techniques described in Table C–1 do
not identify all possible problems with the system, nor do the
suggested corrective actions remedy all problems.
System
Problems
Table C–1 System Problems
Symptom
Possible Cause
Corrective Action
System fan is off
Power cord is not
connected.
Check the power cord
connections at both ends.
Faulty power
cord.
Replace power cord.
Power supply fan
has failed.
Replace the power supply.
Power light is
off.
Power cord is not
connected.
Check the power cord
connections at both ends.
Continued on next page
C–2
