Daktronics Galaxy AF-3050 Series, Display Manual

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Section 4: Maintenance and Troubleshooting
Important Notes:
1. Power must be turned off before any repair or maintenance work is
done on the display.
2. Qualified service personnel must make any access to internal display
electronics.
3. The Daktronics engineering staff must approve ANY changes made to
the display. Before altering the display, detailed drawings for the
proposed modifications must be submitted to the Daktronics
engineering staff for evaluation and approval or the warranty will be
rendered null and void.
4.1 Maintenance and Troubleshooting Overview
The 20mm Galaxy displays are front accessible; meaning access to the internal components can be
gained only from the front of the display.
This section provides the following Galaxy display information:
· Signal Routing Summaries: Provide a basic explanation of the power travel through the display.
· Power Routing Summaries: Offer a basic explanation of the power travel through the display.
· Service and Diagnostics: Give instructions for removing various display components and
explains the functions of circuit board connectors and the meanings of any diagnostic LEDs.
·
Maintenance: Records a number of steps to take to keep this Galaxy display in safe, working
order.
·
Troubleshooting: Supplies some possible display malfunctions and provides a number of
possible causes for that malfunction.
·
Replacement Parts List: Recommends the descriptions and numbers of display components that
could possibly need replacing during the life of this display.
· Daktronics Exchange and Repair and Return Programs: Explain the Daktronics component
return policy.
4.2 Signal Summary
The signal routing for the display can be summarized as follows:
1. Data from the controller computer travels via an RS422 cable into face “A” of the display.
2. RS422 cable relays signal between the face “A” controller and the face “B” controller.
3. The signal then travels over a 40-conductor ribbon cables from J11/J12 on the controller to P2 on
the driver of the first column of modules in each display face.
4. Data exits at J1 and is relayed to J2 of the next driver board. The data from the controller jack
travels down the entire row of modules. The drivers use this display data to control the LEDs.
Modem
If a modem was ordered with the display, it will be mounted inside the display cabinet, near the
controller. The modem is used in lieu of a direct communication line with the computer.
Maintenance and Troubleshooting 4-1