Troubleshooting guide

AUDIO INTERNATIONAL, INC. 10/97
8
Document #540056, Rev. IR, Model No.: PA-7500A
2.6 Electrical Requirements
2.6.1 The PA-7500A utilizes two connectors. P1 and P2. P1 is a 25 pin
connector. The signals interfaced through P1 are left / right speaker, 28
VDC emergency power and woofer outputs. Power requirement is 28
VDC at continuous power output @ 12 amps (15 amp breaker-4 channel).
2.6.2 P2 is a 37 pin connector. The signals interfaced through P2 are PA /
chime, briefer, stereo left and right (high and low), RS-485 data bus, and
28 VDC power. When the briefer key input is activated, all entertainment
audio will be muted. The PA key input has the highest priority and it will
override all briefer and entertainment audio inputs. When the PA source
is keyed, all other audio will be muted. Chime inputs will operate
simultaneously with the briefer.
2.7 Pinouts / Descriptions
The PA-7500A unit connectors and descriptions are as follows:
Pin # Description Pin # Description
P1
1 Left Speaker 1 - High 14 Woofer 1 – High
2 Left Speaker 2 – High 15 Emergency Bus 28 VDC In
3 Left Speaker 1 – Low 16 28 VDC
4 Left Speaker 2 – Low 17 28 VDC
5 Woofer 1 – Low 18 Ground
6 28 VDC 19 Ground
7 28 VDC 20 Ground
8 28 VDC 21 Ground
9 Woofer 2 – Low 22 Chassis Ground
10 Right Speaker 1 – Low 23 Ground
11 Right Speaker 2 – Low 24 Ground
12 Right Speaker 1 – High 25 Woofer 2 – High
13 Right Speaker 2 – High