Daktronics AB-1600-1.5,2.5 - Manual (Page 73)

Maintenance & Troubleshooting
4-29
4.20 Troubleshooting Checklist – Data Distributor Displays
If the display has a data distributor, the following table covers a few possible problems that might be
encountered while operating the display, along with a cause/solution. While this list does not cover
every possible problem, it does list those that are most likely to occur.
Problem Possible Cause/Solution
One or more lamps will not light. • Replace the lamp.
• Replace the socket.
• Replace the lampbank
One or more lamps will not turn off. • Check for metallic foreign objects on the
lampbank causing a short.
• Check for foreign objects on PC board.
• Replace the lampbank
None of one row of modules across the
entire display is working. • Check output card at data distributor.
• Replace output card at data distributor.
• Check signal cables to the first column
director in that row.
• Replace column director.
A section of the display is not working
(multiple rows in a group up to 4
modules long.) • Check signal cables to the column director for
that section.
• Replace the column director.
A row of modules up to 4 modules long
is not working. • Check the signal cable to the line controller in
that row.
• Replace the line controller.
Garbled display or shifted sequence. • Check Cat-5 network cable
• Check output on data distributor output card
• Set computer and line receiver to high line
feed.
Single module does not work • Check signal connection (ribbon cable).
• Check power connections.
• Check appropriate breaker in panelboard.
• Replace lampbank.
Group of 2 modules does not work. • Check appropriate breaker in panelboard.
• Check transformer for correct output (24
VAC).
Entire display does not respond to any
source of data. • Check clear LED on receiver board (if red,
data distributor is not getting signal)
• Controller may be off
• Fiber optic connection may be bad or broken
Display works for a short time and then
blanks. • Check that all fans are operational and
running at full RPM.
• Check that filters are not plugged and limiting
airflow.