DEC MicroVAX 3100 85 Troubleshooting Instructions page 9

Table 1-1 Basic Troubleshooting
Symptom
System Problems
The system unit fan is
off' or the power light is
off'.
The power-up display
does not show after 20
seconds. .
Possible cause
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.
The overload protection
circuitry of the power
supply may have shut
down because of an
abnormal condition on
the power line.
The power supply unit
(PSU) is faulty.
The terminal cable is
not correctly connected.
The terminal cable is
not connected to the
correct MMJ port.
The power cord is not
connected. The power
cord may be faulty. The
wall outlet may not be
working.
The terminal fuse may
have blown.
The terminal settings
may be incorrect.
Suggested Solution
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.
Tum the system off' and then turn
it back on.
Contact your Digital services
representative.
Make sure that all the cables are
connected at both ends.
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.
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.
Replace the blown terminal fuse.
See the terminal documentation.
See the MicroVAX 3100 Model
85/95 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