Installation manual

Audio International, Inc. PA-475-A (-B) (-C) Installation
Document #540021, Rev. C, 4/2000 Page 10 of 12
3.9 Post-Installation Test
With the aircraft power “ON”, test the audio amplifier. Any unit connected
to the RS485 data bus may be used to test proper operation of the unit.
While an entertainment audio unit is sending audio signals through the
amplifier, key and speak into a microphone to ensure that the page /
chime overrides the entertainment audio. Ensure all microphones are
tested. Verify that the briefer audio can be heard through the speakers.
Remove power from the amplifier and verify that the +28 VDC emergency
power is supplied to the amplifier. Verify that the subwoofers are disabled
while emergency power is applied. Ensure that PA audio can be heard in
the speaker system from all respective microphones.
4.0 Troubleshooting Guide
General Troubleshooting Procedures
Many problems can be isolated with the following general techniques:
• To verify power to the unit, recheck 115 VAC and +28 VDC 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 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.
Should difficulties arise in the installation or operation of the unit, contact Audio
International, Inc. product support.