Daktronics BA-1518, Display Manual, Page: 74 / 204

9.2 Maintenance and Troubleshooting Overview
Standard Daktronics outdoor LED scoreboards typically are front-accessible, but some models
may be ordered with rear service access. For that reason, Daktronics team name message centers
have been designed so that they may be accessed from both the front
and rear for easy
maintenance and repair of internal components.
This section provides the following TNMC information:
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Signal routing summary: provides a basic explanation of signal travel through the
TNMC display.
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Power routing summary: provides a basic explanation of power travel through the
display.
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Service and diagnostics: provides instructions for removing various display components
and explains the functions of circuit board connectors as well as the meanings of
diagnostic LEDs.
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Maintenance: lists a number of steps to take to keep the team name message centers in
safe, working order.
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Troubleshooting: lists possible display malfunctions and suggests a number of causes
and corrections for each malfunction.
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Replacement parts list: includes the part description and number of display components
that may have to be replaced during the life of this display.
9.3 Signal Summary
Reference Drawings:
Schematic, Amber TNMC, Gen IV ............................... Drawing A-252645
Schematic, Red TNMC, Gen IV ................................... Drawing A-252681
Component Locations; 832/848
Red/Amb Led TNMC, G-4 ..................................... Drawing A-257029
Refer to your schematic, Drawings A-252645 or A-252681 , for complete information on TNMC
signal routing. Drawing A-257029 indicates the locations of the internal electronic components.
From signal input from the All Sport controller, routing can be summarized as follows:
1. Data from the display controller travels via cable harness into the scoreboard.
2. The signal then travels through the driver/power enclosure to the J1 connector on the
current loop interface card.
3. Data exits at J42 via current loop harness, and connects with P43 at the TNMC controller
assembly. An interconnect harness carries the signal to the first module, and the signal
relays from module to module, in daisy-chain style, until it reaches the last module on
the message center.
9.4 Power Summary
Reference Drawings:
9-2 TNMC Maintenance