Daktronics SPORTSOUND 2000HD, Installation Manual

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Troubleshooting
17
Indicator Lights
Audio Control Rack
Refer to the troubleshooting section of a specific audio control rack manual for more
information about the indicator lights that show signal output to the audio cabinet.
Fiber Conversion Box
Within the fiber conversion box, indicator lights on the equipment help verify proper
connection with the sound cabinet. Refer to Media Converters (p�23) and Input/
Output Expander (p�24) .
System Testing
Use the audio system’s Monitor Application to verify all channels of amplifiers and drivers
are functioning correctly. Refer to the Sportsound Amplifier Field Guide (DD3318172) ,
available online at www.daktronics.com/manuals , for more information.
1� With a full-range audio source (music) playing at a moderate level through the
system, click the Start Monitoring button.
2� Click the Standby Protect button next to each channel to mute them.
3� After muting every channel, un-mute one channel at a time and listen for audio.
4� Un-mute all channels, and stop all source audio from the control rack.
5� Click the Test Tone button for AMP1 and compare the Impedance value (in ohms Ω)
to the reference ranges shown beneath the Channel #.
6� Repeat Step 5 for all remaining amplifiers. If any impedance values are out of the
reference ranges by half or double, test the individual drivers connected to the
suspect amplifier(s). Refer to Driver Troubleshooting (p�17) .
Driver Troubleshooting
Tools Required: Multi-meter, 9V battery
To access the driver, follow Steps 1-2 in the appropriate driver type section under Driver
Replacement (p�19) .
Before removing the driver, verify correct DC
resistance of the driver using a multi-meter
( Figure 21 ). Check the DC resistance of each
driver separately, or check the DC resistance
at the harness. Connect each lead of the multi-
meter to the terminals of the driver (or proper pins
on the harness), and make sure the multi-meter is
set to measure the DC resistance.
Driver Part Number Resistance
A-2302 (High Frequency) 8.5 Ω
A-2305 (Mid Frequency) 6.6 Ω
A-2306 (Low Frequency) 6.0 Ω
Depending on site conditions, the measurements may fluctuate up and down slightly so
don’t be alarmed; figure out an average. If the resistance is showing near 0 or open, this
indicates the coil of the driver is bad and needs to be replaced.
Figure 21: Mid-Frequency Driver & Meter