Digital Equipment DEC 3000 Series Service Information page 188

Troubleshooting Tables,
6–20
Continued
Table 6–20 (Continued) System Problems
Symptom
The power-up
display is not
displayed, and the
diagnostic LEDs
display the DD
code.
The system does
not boot at power-
up.
Possible Cause
The monitor is
turned off.
The monitor
brightness and
contrast controls
are too dark to see
the screen display.
The monitor fuse is
blown.
Software is not
installed.
Corrective Action
Reseat the I/O
module system
module.
Reseat memory
motherboards.
Turn on the monitor.
Adjust the monitor
brightness and
contrast controls.
Check the monitor
cable and video
connections.
See the monitor's
documentation for
fuse replacement
instructions.
Install the system
software. See
the software
documentation
for installation
instructions.
Continued on next page