Troubleshooting,
Continued
Table C–1
(Continued) System Problems
Symptom
Possible Cause
Corrective Action
Alternate console
switch is in
wrong position.
Turn the power off. Move
the alternate console
switch to the down (off)
position. Use a small
pointed object. Do NOT
use a pencil to set the
switch. Turn the power
back on.
Monitor fuse is
blown.
See the monitor guide
for fuse replacement
instructions.
Wall socket may
not be operative.
Try a different wall socket,
or try an electrical device
that you know works in
the wall socket.
Check the diagnostic LED
code. Compare the code
to the LED error code
tables in the VAXstation
4000 Service Information
Kit Model 90 Base System
manual. Replace the
monitor failed FRU. Refer
to the monitor service
manual for instructions on
how to replace the FRU.
Color monitor is
installed, but the
color graphics
board is not
installed.
Verify the graphic module
part number, and that
the monitor is designed to
work with that graphics
module.
Continued on next page
C–4
