Daktronics AB-1600-1.5,2.5 - Manual (Page 63)

Maintenance & Troubleshooting
4-27
4.23 Troubleshooting Checklist – Line Receiver Displays
If the display has a line receiver, the following table covers a few problems that you may encounter
while operating the display, along with a cause/remedy. 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.
• = Replace the lampbank.
Not all of one row of modules, or
part of one row of modules, is
working. • = Check for a bad vertical shift board (VSB)
by swapping in a known good vertical shift
board.
• = Replace the ribbon cable from the VSB to
the underlying lampbank.
• = Check appropriate breaker in panelboard.
• = Check for 120 VAC incoming display
power.
• = Replace the last working lampbank in that
row.
Garbled display or shifted
sequence. • = Set computer and line receiver to high line
feed.
• = Double check line receiver is set for correct
display size.
• = Replace line receiver.
Entire display does not work • = Check for 120 VAC incoming display
power.
• = Check fuse in fan control enclosure.
• = Check line receiver indicator LEDs.
• = Check all signal connections.
Single module does not work • = Check signal connection.
• = Check power connections.
• = Check appropriate breaker in panelboard.
• = Check in-line transformer fuse.
• = Replace lampbank.
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.