Table 1–1 Basic Troubleshooting
Symptom
Possible Cause
Suggested Solution
System Problems
The system unit fan is off
or the power light is off.
The power cord is not
connected. The power cord
may be faulty. The power
socket may not be working.
The system breaker or wall
outlet may have blown.
Make sure that all the power cords
are connected correctly at both
ends. Try a known good power cord
or test the power socket with an
appliance that works.
The overload protection
circuitry of the power
supply may have shut down
because of an abnormal
condition on the power line.
Turn the system off and then turn
it back on.
The power supply unit
(PSU) is faulty.
Contact your Digital Services
representative.
The power-up display does
not show after 20 seconds.
The terminal cable is not
correctly connected.
Make sure that all the cables are
connected at both ends.
The terminal cable is not
connected to the correct
MMJ port.
Check the MMJ port to which the
terminal cable is connected. If this
port is not MMJ port 3, remove the
terminal cable and connect it to
MMJ port 3.
The power cord is not
connected. The power cord
may be faulty. The wall
outlet may not be working.
Make sure that all the power cords
are connected correctly at both
ends. Try a known good power cord
or test the power socket with an
appliance that works.
The terminal fuse may have
blown.
Replace the blown terminal fuse.
See the terminal documentation.
The terminal settings may
be incorrect.
See the
MicroVAX 3100 Model 90
Operator Information
manual for
the list of correct terminal settings.
See the terminal documentation for
information on how to set up the
terminal.
(continued on next page)
Troubleshooting and Diagnosing Problems 1–3
