Daktronics DF-12xx - Manual (Page 29)

Maintenance and 3-7
Troubleshooting
3.5 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
Entire Display Fails to Work • Check for proper line voltage at termination
panel
• Check connections from power supply to driver
• Check power LED on driver
Cannot communicate with
Display via Current Loop • Check connections at J-box and display
• Make sure DataMaster is receiving power
• Check serial cable from DataMaster to J-box
• Remove screws and plug DataMaster directly
into the J-box
Cannot communicate with
Display via Radio • Check for power to signal converter connected
to Server
• Check wire connections from signal converter to
Server
• Check connections from Client to display
• Make sure display and DataMaster have power
Cannot communicate with
Display via Modem • Make sure modem at display is connecting via
phone line
• Make sure display and DataMaster have power
Garbled display • Internal driver logic malfunction
• DataMaster malfunction
Digit will not light • Black wire to digit broken
• Poor contact at driver connection
• Driver malfunction
Segment will not light • Broken LED or connection
• 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.)