Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 40)

Diagnostics and Troubleshooting 32
Note that some LEDs, such as “Run” and “Receive
signal”, have the same number. This occurs because the
controller includes two layers of circuit board which are
not easily shown in an illustration. Be sure to note the
name as well as the number of the LED when looking at
the diagnostics chart.
Temperature Sensor Diagnostic
If the display includes a temperature function, the temperature sensor
board will also provide diagnostic information. The temperature sensor
board is located inside the temperature sensor housing which mounts
near the display (Figure 34). The sensor board diagram shows the red
diagnostic LED (DS2) near the bottom edge of the component.
Temperature Sensor
DS2 Red Run FLASH at variable rates when sending
temperature information; evidence that the unit
has power.
Figure 33: Controller Layout
Figure/ label LED # Color Operation
Run DS4 Red Steady FLASH about once per second indicates controller
is working properly.
Send signal
TX1
DS3 Yellow OFF is the normal state. FLASH when transmitting
communication from the computer.
Receive signal
RX1
DS4 Yellow OFF is the normal state. FLASH when receiving
communication from the computer.
Figure 34: Temperature
Sensor Board