Daktronics SPORTSOUND 500HD, Installation Manual

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Troubleshooting
18
Driver Part Number Resistance
A-2302 (High Frequency) 8.5 Ω
A-2305 (Mid Frequency) 6.6 Ω
A-1903 (Low Frequency) 6.5 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.
It’s possible that the coil is perfectly fine on cone drivers (mids and lows), but the spider,
diaphragm, or surround is damaged, eliminating or restricting the cone from moving
in and out. Visually check the surround and make sure it is in good condition. It may
be necessary to remove the driver from the speaker assembly. Carefully push on the
diaphragm and see if it can move in and out to verify the driver is not seized. Apply a 9V
battery to the driver terminals and listen for any rubbing or stuck coils.
If the driver checks out fine, further troubleshooting of the system is required.
Note: Daktronics speaker assemblies have drivers wired in parallel. Use the following
chart when measuring the DC resistance of a harness. Refer to Figure 26 for
harness connector pinout. Be sure to disconnect any field-terminated wires from
the speaker cable terminal block, located in the lower-left corner of the control
enclosure ( Figure 27 ) before measuring the resistance.
Harness Channel 1 Channel 2 Channel 3
Amp 1 Pins 1-2 / WHT/BLK = 3.2 Ω Pins 3-4 / RED/BLK = 3.2 Ω Pins 5-6 / BLU/BLK = 4.2 Ω
*Amp 2 Pins 7-8 / ORG/BLK = 3.2 Ω Pins 9-10 / GRN/BLK = 4.2 Ω -
* Amplifier 2 harness will only read values in dual-sided systems, where there are two
amplifiers in the control enclosure.
6
Amp 1
Channel 1
5 4
1 2 3
Channel 3
Channel 2
6
Amp 2
Channel 1
5 4
1 2 3
Channel 2
Figure 26: Harness Connector Pinout
1
TBL2
WHT
BLK
RED
BLK BLU BLK
ORG
BLK
GRN
BLK
2 34 56 78 910
Remove these
wires prior to
measuring
resistance
Figure 27: Speaker Cable Terminal Block