Audio international PA-9075-101-1 User manual

7300 Industry Drive, North Little Rock, AR 72117
Phone: [phone] Fax: [phone]
www.audiointl.com
Installation Manual
PA-9075-101-x
Serial Digital Cabin Audio Amplifier
Document # 540312
a DeCrane Aircraft Company

Audio International, Inc. PA-9075-101-x Installation Manual
Document # 540312, Rev IR, 07/2005 Page 1 of 13
Document Revision History
Rev. Level Date Description
IR 07/2005 Initial Release
Reference Documents
Document # Description
525271 Rev IR PA-9075-101-x Outline Drawing
Service Bulletin List
Service
Bulletin # Subject Manual Revision
Revision
Date
Table of Illustrations
Section # Description Page #
2.3 Typical Application 5
7.0 Reference Drawings 12-13
PROPRIETARY NOTICE: Despite any other copyright notice, this document and information
disclosed herein contains confidential, proprietary designs owned by Audio International, Inc.
Neither this document nor the data contained herein shall be reproduced, used, or disclosed to
anyone without the written authorization of Audio International, Inc.

Audio International, Inc. PA-9075-101-x Installation Manual
Document # 540312, Rev IR, 07/2005 Page 2 of 13
Table of Contents
Section Description Page
1.0 General Information ……………………………………………. 3
1.1 Introduction ……………………………………………………….. 3
1.2 Purpose of the Equipment ………………………………………. 3
1.3 Optional Equipment ……………. .…………………………….. 3
2.0 Application ……………………………………………………….. 4
3.0 Installation ……………………………………………………….. 6
3.1 Prior to Installation ……………………………………………….. 6
3.2 Unpacking and Inspection ………………………………………. 7
3.3
Cautions & Warnings …………………………………………….. 7
3.4 Wiring Requirements …………………………………………….. 8
3.5 Electrical Characteristics…………………………………………. 9
3.6 Mating Connector Information ……………..……………………. 10
3.7 Pinout Assignment Descriptions ………………………………... 10
4.0 Troubleshooting………………………………..……………….. 11
4.1 Instructions for Continued Airworthiness……………………..… 11
4.2 General Troubleshooting Procedures ………………………….. 11
5.0 Specifications …………………………………………………… 12
6.0 Reference Drawings ……………………………………………. 12

Audio International, Inc. PA-9075-101-x Installation Manual
Document # 540312, Rev IR, 07/2005 Page 3 of 13
PA-9075-101-x
Serial Digital Cabin Audio Amplifier
1.0 General Information
1.1 Introduction
This manual contains information for the proper installation of the Audio
International, Inc. (AI) Serial Digital Cabin Audio Amplifier, Model No:
PA-9075-101-x. The “-x” suffix in the model number designates the type
of connector utilized; “-1” = Positronic and “-2” = D-Subminiature. Also
included are physical and electrical characteristics of the unit.
1.2 Purpose of the Equipment
Audio International’s PA-9075-101-x serial digital cabin audio amplifier
provides public address and chimes amplification as well as amplification
of cabin entertainment audio.
The cabin audio amplifier has the ability to prioritize audio inputs in the
following order:
1. Passenger address;
2. Briefer;
3. All other audio sources.
Lower priority sources will mute in the presence of higher priority signals.
The cabin audio amplifier is capable of providing passenger address audio
in the event of a loss of normal aircraft electrical power, independent of
the cabin management system.
1.3 Optional Equipment
Audio International, Inc. offers a comprehensive family of Cabin Control
Modules and Source Equipment, such as DVD players and Videocassette
Players. These modules provide convenient solutions for a variety of
frequently encountered interfacing needs or special requirements and are
an important part of AI’s “building block” system for configuring total cabin
management.
Contact your AI representative for details.

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2.0 Application
2.1 Each unit has a single digital audio input, analog cabin briefer audio input,
discrete key inputs, 4 full range speaker outputs, PA audio output, RS-485
data bus interface, and power/ground inputs.
2.2 Function control is accomplished via the RS-485 data bus interface to the
Master Control Unit switch located in the aircraft cabin.
2.3 Three (3) selectable ID inputs providing the capability to have eight (8)
units per installation.
2.4 The module is designed to interface with typical cockpit audio systems as
a stand-alone Passenger Address Amplifier, or to be integrated with Cabin
Management Systems as part of an integrated cabin entertainment
system.
2.4.1 Audio Input (Digital)—Typical interfaces include various types of
audio source equipment. This unit is capable of interfacing and
accepting input from all Audio International and standard COTS
(Commercial-Off-The-Shelf) audio source equipment using the
AES-3 digital audio standard.
2.4.2 Audio Input (Analog)—The module is designed to interface with
typical analog cockpit audio systems as a stand-alone Passenger
Address Amplifier.
2.4.3 Discrete Interface(s)—Typical interfaces include existing aircraft
and COTS (Commercial-Off-The-Shelf) control and/or indication
devices and/or systems. This unit is capable of interfacing,
accepting, and/or providing input to and/or from all such devices
and/or systems incorporating similar interfaces for communication,
control, and/or status indication.

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2.5 Typical Application—Block Diagram

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3.0 Installation
3.1 Prior to installation, the following items should be considered:
3.1.1 During the design and layout of the aircraft cabin, careful
consideration of the location of this module is necessary. Some of
the items to be considered include:
• Space
• Available power supply
• Environmental conditions (temperature, humidity, etc.)
• Length of cable runs
3.1.2 The PA-9075-101-x shall be installed to conform to the standards
designated by the customer, installing agency, and existing
conditions as to the unit location and type of installation.
3.1.3 The chassis material is brushed aluminum with a gold irridite finish
to provide electrical conductivity to ground from any point on the
chassis. Each connector location shall have the respective
connector ID designation etched into chassis above connector
attachment location to chassis in a contrasting manner for easy
readability.
3.1.4 Installation recommendation requires 2" spacing from other
equipment, modules, and structures except the mounting surface
for which the unit should be in direct contact.
3.1.5 Mounting points consist of four (4) 0.28 in. diameter mounting holes
(2 on each end).
3.1.6 This unit is capable of being mounted in any orientation whether it
be horizontal, vertical, inverted, or at an angle.

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3.2 Unpacking and Inspection
3.2.1 Carefully open the packaging and remove the PA-9075-101-x.
Verify that all components have been included in the package per
the packing list. Inspect the unit for damage. Retain the packing
materials and packing list.
3.2.2 If damage has occurred during shipping, a claim should be filed
with Audio International WITHIN 24 hours and a Return Request
Authorization Number shall be obtained from AI by contacting the
Repair Department at 501.801.0640. Repackage the unit in its
original packaging materials and return it to AI following instructions
given by the AI representative. Refer to the front cover of this
manual for address. If no return is necessary, retain the packing
list and the packing materials for storage.
3.3 Cautions and Warnings
3.3.1 It is important to do a pin-to-pin power and ground check on all
connectors. Ensure that power and ground are applied only where
specified. Damage to the unit may result if power or ground is
applied to the wrong points.
3.3.2 DO NOT connect or disconnect the monitor while power is applied.
3.3.3 DO NOT remove any factory-installed screws. Damage to the unit
may result and void any warranties.
3.3.4 DO NOT expose to moisture.
3.3.5 ESD (Electro Static Discharge) guidelines shall be followed.

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3.4 Wiring Requirements
3.4.1 Introduction
The installing agency shall supply and fabricate all external cables
and mating connectors. The length and routing of external cables
should be carefully studied and planned before attempting
installation of the equipment. Allow adequate space for installation
of cable and connectors. Avoid sharp bends and placing cables
near aircraft control cables. Maintain a minimum clearance of three
(3) inches from any control cable. If wiring is run parallel to
combustible fluid or oxygen lines, maintain a separation of six (6)
inches between the lines.
3.4.2 Power Wires
The PA-9075-101-x can consume 13 Amps (maximum), which
should NOT be routed through one (1) 22 AWG wire. Audio
International recommends that all five (5) power supply wires use
22 AWG (minimum) in accordance with MIL-W-22759.
Circuit/chassis ground connection shall be bonded to an electrically
conductive chassis mounting point or frame ground with less than
0.01 Ωresistance using less than 50 Ωimpedance cable.
3.4.3 Serial Digital Audio Wiring
All digital audio wire connections must be twisted shielded cable
with the shield properly grounded to the dedicated pin at the source
end to the dedicated pin at the load end. Twisted shielded cable
shall be 22 AWG (minimum) for digital audio signals and shall be in
accordance with NEMA WC 27500 or equivalent. Cable
impedance must be 110 Ω+/- 10%.

Audio International, Inc. PA-9075-101-x Installation Manual
Document # 540312, Rev IR, 07/2005 Page 9 of 13
3.5 Electrical Characteristics
3.5.1 Electrical Specifications, PA-9075-101-x:
Electrical Maximum Power 13.0 A @ +28 VDC
Nominal Power 1.0 A @ +28 VDC
Operating Range +18 to +32 VDC
PA Microphone Bias 35 mA (max)
Interface
PA Microphone
Unbalanced, 600 Ωinput
impedance; 3.5 VRMS max
input; 30 dB max gain
Briefer Audio
Balanced, 20 kΩinput
impedance; 3.5 VRMS max
input; 30 dB max gain
Entertainment Audio
in AES-3 Digital audio
PA Audio Output
Balanced, 600 Ω(min)
output impedance;7 VRMS
(max) drive
PA Sidetone Output 7 VRMS (max) drive
Amplifier Class D audio
amplifier 20 Hz – 18 kHz
Output Power 70 WRMS x 4 Channels
3.5.2 Discrete Interfaces—Active and inactive states for each input are
defined below as follows:
PA Microphone Key GND (< 0.7 V)
Briefer Key GND (<0.7 V)
PA Key Output Open collector GND, 100 mA
(max) drive
Chime In +28 VDC
TT Chime In +28 VDC
Call In GND (< 0.7 V)
Hook In GND (<0.7 V)
Low Tone Chime In GND (<0.7 V)
Weight On Wheels
Input GND (<0.7 V)
3.5.3 This unit incorporates an RS-485 serial data bus interface for
communication purposes to other network-connected devices.
3.5.4 This device has three (3) selectable ID inputs providing the
capability to have eight (8) units per installation.

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3.5.5 An LED is provided for each of the four (4) amplifiers that will light
to indicate when the applicable amp is in the ON state, and will
blink at 4 Hz whenever the amplifier is in an overload condition.
See Section 6.0 for details.
3.6 Mating Connector Information
All wiring harnesses to the unit shall be supplied and fabricated by the
installing agency.
Model # Connector Mating Connector
PA-9075-101-1 J1 RD25F10JVL0 (Positronic Industries)
PA-9075-101-2 J1 DBMA-25S
PA-9075-101-1 J2 RD37F10JVL0 (Positronic Industries)
PA-9075-101-2 J2 DCMA-37S
3.7 Pinout Assignment Descriptions
J1
Pin Description Pin Description
1 Left Speaker 1 HI 14 Left Speaker 2 HI
2 Reserved 15 Emergency Bus +28 VDC In
3 Left Speaker 1 LO 16 +28 VDC
4 Reserved 17 +28 VDC
5 Left Speaker 2 LO 18 GND
6 +28 VDC 19 GND
7 +28 VDC 20 GND
8 +28 VDC 21 GND
9 Right Speaker 2 LO 22 Chassis GND
10 Right Speaker 1 LO 23 GND
11 Reserved 24 GND
12 Right Speaker 1 HI 25 Right Speaker 2 HI
13 Reserved

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J2
Pin Description Pin Description
1 MIC Bias 20 PA MIC Audio LO
2 PA MIC Audio HI 21 Reserved
3 Weight On Wheels Input (GND) 22 Briefer Audio LO
4 Briefer Audio HI 23 Reserved
5 Reserved 24 PA MIC KEY (Active GND)
6 AES-3 Input + 25 Briefer KEY (Active GND)
7 AES-3 Input - 26 PA Audio Output HI
8 AES-3 Shield 27 PA Audio Output LO
9 ID Common 28 PA KEY Output
10 Data bus SH (Maintenance Port) 29 Databus A In (CMS)
11 +28 VDC Output (Maintenance Port) 30 Databus B In (CMS)
12 GND Output (Maintenance Port) 31 Chime In (+28V)
13 Data bus A Output (Maintenance Port) 32 TT Chime In (+28V)
14 Data bus B Output (Maintenance Port) 33 Call In (Active GND)
15 ID0 34 Hook In (Active GND)
16 ID1 35 PA Sidetone Out HI
17 ID2 36 PA Sidetone Out LO
18 Reserved 37 Low Tone (Active GND)
19 Reserved
4.0 Troubleshooting
4.1 Instructions for Continued Airworthiness
No periodic scheduled maintenance or calibration is required for continued
airworthiness of the PA-9075-101-x. If the unit fails to perform to
specifications, it must be removed and serviced by a qualified service
facility.
4.2 General Troubleshooting Procedures
• Verify power to the unit by rechecking +28 VDC power is applied to the
proper pins on the unit. Use a voltmeter to verify correct level.
• Remove power from the unit for at least one (1) minute and reapply
power.
• Recheck all connections to the unit for security. Check all harness
runs for possible pinching. Recheck all pinouts for application
accuracy.

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5.0 Specifications
Physical Specifications – PA-9075-101-x
Weight Approx. 2.02 lb / 0.92 kg
Dimensions
(l x w x h)
9.3" x 4.9" x 2.0"
24 cm x 12 cm x 5.1 cm
6.0 Reference Drawings
The following diagrams show the unit dimensions, mounting locations, and
connector locations for the PA-9075-101-x.

Audio International, Inc. PA-9075-101-x Installation Manual
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