Daktronics DF-4000 - Manual (Page 21)

Maintenance and 4-3
Troubleshooting
4.5 Troubleshooting
This section lists potential problems with the display, indicates possible causes, and
suggests corrective action. This list does not include every possible problem, but it
does represent some of the more common situations that may occur. (Refer to the
appropriate manual for a list of potential problems with add-on or separately
mounted message centers.
Symptom/Condition Possible Cause
Garbled display Internal driver logic malfunction
Control console malfunction
Digit will not light Broken black wire to digit
Poor contact at driver connection
Driver malfunction
Segment will not light Broken LED or connection
Driver shift register failure
Broken wire between driver and digit
Poor contact at driver connector
Segment stays lit Driver shift register failure
Short circuit on digit
Data appears in the wrong place
on the display, wrong data on a
particular line of the display
Incorrect address settings on drivers
(Refer to “Power On Self-Test” in the
following section, and consult tables to set
correct addresses.)
Some DataMaster displays have their own built-in troubleshooting mechanism.
Failures that may occur in the display driver are described using codes. In the event
a sign malfunctions, a failure code registers by displaying an “Ex” value on the first
two digits of the display. “E” simply indicates an error, and the letter “x” represents
the actual code number. Refer to the following table for a description of each failure
code and for possible solutions.
Note: The LCD screen on the DataMaster 100 controller will not show the
failure codes described in the table below. Failure codes will only be
displayed on the DataMaster sign.
Failure Code Description Possible Solution
E4 No Message Error: This code is
shown when there are no
messages downloaded to the
display
Download a new message to the
display using the < UPDATE
DISPLAY > key on the DataMaster
100 controller.