Troubleshooting guide

AUDIO INTERNATIONAL, INC. 10/97
9
Document #540056, Rev. IR, Model No.: PA-7500A
Pin # Description Pin # Description
P2
1 No Connection 20 PA MIC -
2 PA MIC + 21 No Connection
3 Wgt-On-Wheels Input (Ground) 22 Briefer -
4 Briefer + 23 No Connection
5 No Connection 24 PA MIC Key
6 Left In + 25 Briefer Key
7 Left In - 26 + PA Output
8 Right In + 27 - PA Output
9 Right In - 28 PA Key Out
10 Data Bus Shield 29* SER Data +
11 + 28 VDC (Adj) 30* SER Data -
12* Ground (Adj) 31 Chime In (+28 VDC)
13* SER + (Adj) 32 TT Chime In (+28 VDC)
14* SER – (Adj) 33 Call In (Grnd)
15 No Connection 34 Hook In (Grnd)
16 No Connection 35 PA Sidetone +
17 No Connection 36 High Tone
18 No Connection 37 Low Tone
19 No Connection
*Serial Data Bus
2.8 Connector / Mating Connector Information
Mating connector part numbers are as follows:
Pin # Connector Mating Connector
P1
SD25M10HVL0 SD25F10HVL0
P2
SD37M10HVL0 SD37F10HVL0
2.9 Post Installation Test
2.9.1 With the aircraft power ON, test the cabin audio amplifier. Any unit
connected to the RS-485 data bus may be used to test proper operation of
the unit.
2.9.2 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.