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Maintenance and Troubleshooting 35
Controller
The controller sends data to the modules. Refer to the signal summary in Section 4.2 for more
information and to the component location drawings for the position of the controller board. Figure 34
below illustrates a typical controller.
The Rotary switches set the hardware address, which the software uses to identify that particular
display. When replacing a controller board, be sure to set the Rotary switches in the same address
configuration as the defective controller. Each controller in a network needs a unique address.
Note: Setting the Rotary switches to address 0 (set the switches to 0 by rotating them counter
clockwise until the arrow points to 0) can activate a test mode. The display’s power must be turned off
and then turned back on to run the test mode.
Figure 34: Controller Component Layout