Daktronics BB-2140, Display Manual

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Troubleshooting
8
Schematics
Reference Drawings:
Schematic: Control Enclosure- 120/240V AC .................................................. DWG-216653
For advanced display troubleshooting and repair, it may be necessary to consult the
schematic drawings. DWG-216653 shows detailed power and signal wiring diagrams of
internal display components such as drivers, transformers, and horns.
The schematic drawing also shows the DIP switch settings that control when the horn
sounds and when the LED light strips turn on.
LED Drivers
The LED driver performs the task of switching digits on and off. The LED driver for
transparent shot clocks is located inside of a separate control enclosure. Refer to Figure 4
to view the component locations within the control enclosure.
HAZARDOUS VOLTAGE
BEFORE SERVICING
DISCONNECT POWER
Driver Status
Indicators
Shot Clock Driver Horn Interface Card
Transformers
Figure 4: Driver Enclosure Components
When troubleshooting driver problems, three LEDs labeled DS1 , DS2 , and DS3 provide
diagnostic information.
Note: While it is necessary to have the display powered on to check the LED status
indicators, always disconnect power before servicing.
LED Color Function Operation Summary
DS1 Amber Status Blinking
DS1 will be blinking at one second intervals to
indicate the driver is running.
DS2 Green Power Steady on
DS2 will be on and steady to indicate the driver
has power.
DS3 Red Signal RX
Steady on
or Blinking
DS3 will be on or blinking when the driver is
receiving a signal and off when there is no signal.