Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 39)

Diagnostics and Troubleshooting
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Section 7: Diagnostics and Troubleshooting
Safety Precautions
• Disconnect power when servicing the display.
• Do not modify the display structure or attach any panels or coverings to the display
without written consent of Daktronics.
7.1 Controller Diagnostics
The controller is located in the left end of Face A, second row from bottom, as labeled in
Figure 32. Since the controller is inside the display, a module will need to be removed to
view the diagnostic LEDs. To access the interior of the display, refer to Section 6.1 for
instructions.
Remember to turn off power to the display before accessing the interior.
However, once the modules are removed and wires are found to be safe, power can be
turned back on to view the diagnostic LEDs.
The controller is the component that receives communication from the computer and then
sends data to the modules. A typical controller is illustrated in Figure 33. Diagnostic LEDs
are located at various places on the controller. The following table details some essential
LEDs to monitor and the information that each LED provides. The LED name and number
are noted in Figure 33.
Figure 32: Interior Component Locations