Maintenance and Troubleshooting
24
One module is garbled, too
bright or too dim, erratic, etc.
The signal plug terminals are
not seated well, or the wire is
bad.
Inspect all wires and terminals.
Repair as needed.
The module is bad.
Replace the module.
One pixel does not turn off, or
one pixel does not light.
The module is bad.
Replace the module.
One string (half the LEDs) in
one pixel does not light.
The module is bad.
Replace the module.
The LED brightness is wrong—
LED panels are too bright or
too dim.
The light sensor on the module
is obstructed.
Clear the obstruction.
The light sensor is not
configured correctly.
Correct the settings. Refer to
the ACP Operation Manual.
The light sensor on the leftmost
module is bad.
Replace the module.
The DDMS controller is bad.
Replace the DDMS controller.
A pixel test shows all pixels
on all LED panels as bad. The
LED panels play messages
correctly.
The fiber or RS422 LED
panel connections are not
terminated properly.
Re-terminate the LED panel
connections.
The DDMS controller is bad.
Replace the DDMS controller.
The internal temperature
sensor is not reading.
The temperature sensor is not
configured correctly.
Correct the settings. Refer to
the ACP Operation Manual.
Signal or power wiring is bad.
Repair the wiring as needed.
The temperature sensor on the
leftmost module is bad.
Replace the module.
One power supply indicates
“bad” from the operator
software or the DDMS
controller. All others indicate
OK.
AC power to the power supply
is bad—the circuit breaker
tripped or wiring is bad.
Reset the circuit breaker or
repair wiring.
The isolation board on the
power supply is bad.
Replace the isolation board.
The power supply is bad.
Replace the power supply.