Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 50)

Parts Replacement 42
Light Sensor
The light sensor assembly is mounted inside the top left corner of Face A. Refer to Figure 36
for the location. The entire assembly fits over two screws.
If the light sensor should fail, only the circuit board needs to be replaced (Figure 43). Remove
the top left module on Face A to access the light sensor. To replace a light sensor circuit
board, follow these steps.
Note: The hardware mentioned in each step is given a corresponding number in the drawing.
For instance, the nuts mentioned in step 2 are labeled #2 in the figure.
1. Remove the nuts behind the circuit board plate, and then remove the plate and
circuit board from the assembly.
2.
Remove the nuts securing the circuit board to the plate.
3.
Remove the standoffs and attachment screws from the board.
4.
Disconnect the four electrical wires on the sensor by unscrewing each screw that
holds a wire in place. Note the order that the wires are connected.
5.
The light sensor plug on the controller does not need to be detached.
6.
Reattach the new circuit board, following these steps in reverse.
Note: Align the new circuit board so that the lens lines up with the 1/2" circular opening in
the top edge of the display when the assembly is in place.
Figure 43: Light Sensor Assembly