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
power routing. Drawing A-257029 indicates the location of the internal electronic components.
Note that 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.
9.5 Service and Diagnostics
The following subsections address servicing of these display components:
TNMC Controller
Modules and Drivers
Power Supplies
The subsections also address diagnostic LEDs and signal/power connectors found on the TNMC
controller.
Remember: Disconnect power before servicing internal components!
TNMC Controller
Reference Drawings:
4 Column MASC LED Driver Specifications .......... Drawing A-166216
Component Locations; 832/848
Red/Amb LED TNMC, G4 ............................... Drawing A-257029
The TNMC controller, located on the rear-access panel, receives signal directly from the control
console and sends data to the modules. Refer to the signal summary in
Section 9.3 for more information and to Drawing A-257029 for the location of the controller
board in the TNMC. The controller itself is detailed in Drawing A-166216, and Figure 17 below
illustrates a typical controller assembly. The card and transformer are mounted to a tray, which in
turn is mounted to the back panel of the TNMC cabinet.
TNMC Maintenance 9-3
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