Audio International PA-7500A Installation Manual - page 11
Audio International, Inc. PA-7500A Installation
Document # 540056A, Rev. A, 7/2000
Page 10 of 11
4.0
Troubleshooting Guide
4.1
General Troubleshooting Procedures
Many problems can be isolated with the following general techniques:
•
To verify power to the unit, recheck +28 VDC power is applied to the
proper pins on the unit. Use a voltmeter to verify correct level.
•
Reset by removing power from the unit for at least one
(1)
minute and
reapply power. Verify the problem still exists.
•
Recheck all connections to the unit for security. Check all harness
runs for possible pinching. Recheck all pinouts for application
accuracy.
4.2 Troubleshooting Chart
Problem Possible
Cause
Solution
No sound
Unit improperly installed
Verify +28 VDC power and audio
input is present
No audio material in
source unit
Insert audio material in source unit
Poor
audio
quality
Audio controls are not
adjusted properly
Contact AI
5.0
Specifications
Physical Specifications
Housing
Aluminum
Dimensions
(l x w x h)
9.3" x 4.9"
x 2.0"
23.62cm x 12.45cm x 5.0cm
Weight
2.7 lb / 1.22 kg
Electrical Specifications
Power
+ 28 VDC at continuous power output
@ 12 amps,
3.5 amps MINIMUM, 17.5 amps MAXIMUM
Emergency Power
+ 28 VDC Page / Chime
Data Bus Type
AI Proprietary RS-485
Electric Crossover
Low Range: 20 Hz to 135 kHz
High Range: 135 Hz to 20 kHz
Channel Output Power
4-Channel, 75 watts peak output
Input Impedance
10-k briefer, 1 VRMS (NOMINAL)
Output Impedance
4-ohms per channel