16
Maintenance and Troubleshooting
4.2 Troubleshooting
This section lists potential problems with the display, indicates possible causes, and suggests corrective
actions. 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 an add-on or
separately mounted Galaxy
®
display.)
Symptom/Condition
Possible Cause
Entire display fails to work
•
Check for proper line voltage at power termination panel
•
Check connections from power supply to driver.
•
Check power LED on driver.
Cannot communicate with display
•
Check connections at J-box and display.
•
Make sure DataMaster controller is receiving power.
•
Check serial wires from J-box to host driver.
No display on client sign
•
Check for power on client.
•
Check signal wires from host to client.
•
Make sure protocol plug is not connected. (Protocol plug for host
driver only.)
•
Check addressing of client display.
Client drivers will continually cycle through
the power-on self-test host driver.
•
Make sure address is set on the
Garbled display
•
Power down and power display back up.
•
Check connections from driver to digits.
•
Re-send message from DM-100.
Digit will not light
•
Test using different digit board in display.
•
Test using a different output from the driver.
•
Black wire to digit broken.
•
Poor contact at driver connection.
•
Driver malfunction.
Segment will not light
•
Test using output to different segment.
•
Check for broken LED or connection.
•
Check wires between driver and digit.
•
Poor contact at driver connector.
•
Driver shift register failure.
Segment stays lit
•
Test using output to different segment.
•
Check for shorts on wires.
•
Driver shift register failure.
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.)
•
Incorrect connection from driver to digits.
