Daktronics BA-2009, Display Manual

Page: 47 / 120

TNMC Maintenance 6-3
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.
6.4 Power Summary
Reference Drawings:
Schematic, Red LED TNMC, Gen III ........................... Drawing A-187661
Schematic; Amber LED TNMC, Gen III ....................... Drawing A-187662
Component Locations; 832/842
Red/Amb TNMC, G3 ............................................. Drawing A-187987
Use these reference drawings after 11/29/05
Schematic, Amber TNMC, GEN IV .............................. Drawing A-252645
Schematic, Red TNMC, GEN IV .................................. Drawing A-252681
Component Locations; 832/848
Red/Amb
LED TNMC, G4 ..................................... Drawing A-257029
Refer to your schematic,
A-187661 or A-187662 (or A-252645 or A-252681 for
GEN 4) , for complete information on TNMC power routing. Drawing A-187987 for
GEN III only (or A-257029 for GEN 4) indicates the locations of the internal
electronic components.
Note: Amber TNMCs always contain two power supplies, while red TNMCs require
only a single power supply.
Power routing for the display can be summarized as follows:
1. Incoming power terminates at the terminal block in the scoreboard driver
enclosure. Using the same harness and J42-P43 connections as signal,
power is then routed to the TNMC controller where it then travels to both
the power supply assembly and to a transformer on the controller tray.
2. From the power supply assembly, power is relayed to the first module, and
then from module to module.
3. While the modules draw their power directly from the power supply
assemblies (6.5 V for red LED modules, 9 V for amber), the TNMC
controller itself receives 16 V power from the transformer.
6.5 Service and Diagnostics
The following subsections address servicing of these display components: