Audio International PA-9075 301-x Serial Digital Cabin Audio Amplifier Installation Manual
Below you will find brief information for Serial Digital Cabin Audio Amplifier PA-9075 301-x. This is a six-output Class T amplifier that accepts both analog stereo and stereo AES-3 digital audio, analog PA microphone and briefer audio, and can generate chime and ring tones. Operational control is handled through Audio International’s proprietary RS-485 data bus and discrete inputs. The unit has six (6) channels out @ 75 Watts/channel. Two (2) channels are mid-high frequency stereo out, and two (2) channels are low frequency stereo out. The remaining two (2) channels are mono channels for FWD and AFT LAV speakers, which provide mono entertainment audio and PA audio to the LAV, with volume control of the entertainment audio.
Advertisement
Advertisement
Installation Manual
PA-9075-301-x
Serial Digital Cabin Audio Amplifier
Document # 540343
7300 Industry Drive, North Little Rock, AR 72117
Phone: 501-955-2929 Fax: 501-955-2988 www.audiointl.com
Audio International, Inc.
PA-9075-301-x Installation Manual
Document Revision History
Rev. Level
IR
A
Date
11/2006
08/2007
Description
Initial Release
Fixed discrepancies with PTT activation levels and clarified operation of programmable chimes in section
2.11. Two-tone, High-tone, and Low-tone chimes activation statement changed from active low to active high. Mounting holes and bonding requirements changed to reflect outline drawing. Corrected values for
Mic bias, input impedance, max input values, frequency response, and output power in section 3.5.1. Corrected outline drawing document #.
Reference Documents
Document #
525870
Description
PA-9075-301-x Outline Drawing
Service Bulletin List
Service
Bulletin #
Subject
Manual
Revision
Revision
Date
Table of Illustrations
Section #
2.6
7.0
Description
Typical Application
Reference Drawings
Page #
8
16-17
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.
Document # 540343, Rev A, 08/2007 Page 1 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
4.0
3.0
5.0
6.0
Section
1.0
2.0
Table of Contents
Description Page
General Information …………………………………………….
3
1.1 Introduction ……………………………………………………….. 3
1.2 Purpose of the Equipment ………………………………………. 3
1.3 Optional Equipment ……………. .…………………………….. 4
Application ……………………………………………………….. 4
2.1 Function Control…………………………………………………... 4
2.2 State Priorities…………………………………………………….. 5
2.3 ID inputs…………………………………………………………… 5
2.4 Typical Interfaces…………………………………………………. 5
2.5 Typical Application………………………………………………... 8
Installation ……………………………………………………….. 9
3.1 Prior to Installation ……………………………………………….. 9
3.2 Unpacking and Inspection ………………………………………. 10
3.3
Cautions & Warnings ……………………………………………..
10
3.4 Wiring Requirements …………………………………………….. 11
3.5 Electrical Characteristics…………………………………………. 12
3.6 Mating Connector Information ……………..……………………. 13
3.7 Pinout Assignment Descriptions ………………………………... 14
Instructions for Continued Airworthiness ……..…………...
15
4.1 Airworthiness Limitations………………..……………………..… 15
4.2 General Troubleshooting Procedures ………………………….. 15
Specifications ……………………………………………………
15
Reference Drawings ……………………………………………. 16
Document # 540343, Rev A, 08/2007 Page 2 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
PA-9075-301-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-9075-301-x. The “-x” suffix 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-9075-301-x Serial Digital Cabin Audio Amplifier is a six-output Class T amplifier that accepts both analog stereo and stereo
AES-3 digital audio, analog PA microphone and briefer audio, and can generate chime and ring tones. Operational control is handled through
Audio International’s proprietary RS-485 data bus and discrete inputs.
Each unit has 3 microphone inputs, mic bias outputs, mic sidetone outputs, analog cabin briefer audio input, discrete key inputs for microphones, briefer, and cockpit and cabin chime tones, a single digital audio input and single analog audio input, left and right low frequency
(woofer) speaker outputs, left and right high (mid-tweet) frequency speaker outputs, and 2 mono speaker outputs with independent volume control that can be used to drive lavatory or galley speakers, Analog and
AES3 digital PA audio outputs, RS-485 data bus interface, and power/ground inputs.
The unit has six (6) channels out @ 75 Watts/channel. Two (2) channels are mid-high frequency stereo out, and two (2) channels are low frequency stereo out. The remaining two (2) channels are mono channels for FWD and AFT LAV speakers, which provide mono entertainment audio and PA audio to the LAV, with volume control of the entertainment audio. The
PA-9075-301-x also incorporates an integrated tone control and a 10-band
Equalizer.
Document # 540343, Rev A, 08/2007 Page 3 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
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.
2.0 Application
2.1 The unit itself has no active controls. Functional control of the PA-9075-
301-x is accomplished via the RS-485 data bus interface from a controlling device located in the aircraft cabin. A series of LEDs monitors functionality. These LEDs monitor Main Power, Emergency Power, Amp 1 and 2 ON/OFF, Amp 3 and 4 ON/OFF, Amp 5 and 6 ON/OFF, thermal overtemp condition, amplifier overload, and amplifier fault condition. See
Section 6.0, Reference Drawings for LED location and format.
2.1.1 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, provided the emergency power input is connected.
2.1.2 Cockpit Chime input causes a programmable cockpit chime to be generated on the Pilot and Co-Pilot cockpit chime outputs. If the
Cockpit Chime Inhibit input is active, a chime is not generated.
2.1.3 Unit designed with separate volume controls for the lavatory speaker outputs.
2.1.4 Four active high (+28Vdc) inputs and 3 active low inputs used to activate chime tones, Weight-on-Wheels, Ring tones, and Cockpit
Chime.
2.1.5 Software selectable Tone (Bass/Treble) or 10-Band Equalizer for cabin audio channel.
2.1.6 Audio input is software selectable between analog and AES3 digital audio inputs.
2.1.7 Note that speaker ON/OFF functionality actually turns the amplifier section on and off, reducing the power requirement of the module.
Document # 540343, Rev A, 08/2007 Page 4 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
PA, briefer, chime and ring functions will turn on cabin speakers regardless of whether they were on for normal cabin audio.
2.2 State Priorities
Pilot Microphone — Highest Priority. Activating the PA system (PA KEY) overrides all other states, so that the passenger address is the only thing transmitted through the speakers.
Co-Pilot Microphone — 2 nd
highest Priority. Activating the PA system
(PA KEY) overrides all other states with lower priority, so that the passenger address is the only thing transmitted through the speakers.
Cabin Microphone — 3 rd
highest Priority. Activating the PA system (PA
KEY) overrides all other states with lower priority, so that the passenger address is the only thing transmitted through the speakers.
Cabin Briefer — 4 th
highest Priority. Activating the cabin briefer
(BRIEFER KEY) will override all lower priority states.
Call in, Chime in, TT Chime in, and Low Tone are next in priority.
Activation of one of these functions overrides any previous state except
Passenger Address or Briefer. If the previous state has equal priority, the new state assumes priority.
If none of the above states are active, Cabin Entertainment Audio is routed to the amplifier.
2.3 Three (3) selectable ID inputs providing the capability to independently address up to eight (8) units on the same data bus network.
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.
•
Entertainment Audio Input (Analog and 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 or standard analog audio.
•
Chime/PAGE Audio Input (Analog)—The module is designed to interface with typical cockpit audio systems as a stand-alone
Passenger Address Amplifier.
Document # 540343, Rev A, 08/2007 Page 5 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
•
Chime/PAGE Audio Output (Analog and Digital)—The module is designed to output chime/page audio using the AES-3 digital audio standard or standard analog audio.
•
Discrete Inputs — Activation of Microphones for Passenger
Address, Cabin Briefer, Weight-On-Wheels (WOW), High Tone
Chime In, Low Tone Chime In, Two -tone Chime In, and Call In can be done with a standard switch/relay/etc.
Pilot and Cabin MIC KEYs — Pulling these discrete input pins to power ground (<3.5V) routes balanced microphone audio from the MIC INPUTS to the speakers. Additionally, microphone audio is preampified and routed to the Sidetone Out and PA Out pins as balanced audio. An open-collector status pin, PA Key Output, is actively pulled to ground and can sink up to 150mA. If not active, this pin appears as a high impedance. Upon deactivation of the PA MIC KEY input, audio returns to the previous state.
Upon activation of mic key inputs a chime is generated. This chime is programmable and can either be a low, high, two -tone, or no-tone. Upon deactivation of mic key inputs, a chime is generated. This chime is programmable and can either be a low, high, two-tone, or no-tone.
Cockpit Chime and Cockpit Chime Inhibit — Upon activation of cockpit chime, a chime is generated. This chime is programmable and can either be a low, high, two-tone, or notone. Upon deactivation of cockpit chime, a chime is generated.
This chime is programmable and can either be a low, high, twotone, or no-tone.
If the Cockpit Chime Inhibit is active, a chime is not generated when the Cockpit Chime inp ut becomes active or inactive.
Briefer Key — Pulling this discrete input pin to power ground
(<0.7V) routes balanced audio from the BRIEFER INPUTS to the speakers (unless PA is active). Upon deactivation of the
BRIEFER KEY input, audio returns to the previous state.
Upon activation of Briefer key input a chime is generated. This chime is programmable and can either be a low, high, two -tone, or no-tone. Upon deactivation of Briefer key input, a chime is generated. This chime is programmable and can either be a low, high, two-tone, or no-tone.
Document # 540343, Rev A, 08/2007 Page 6 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
Weight On Wheels Input — Pulling this discrete input pin to power ground (<0.7 V) causes a reduction in volume
(approximately 6dB) of the PA audio. This level of reduction is programmable.
Two Tone 0 and 1 Chime Input — Applying an active high
(+28 VDC) to either of these pins cause a two-tone (high/low) chime to sound from the cabin speakers. After the chime sound completes, audio returns to the previous state. The pin must be deactivated before another TT chime tone can be sounded using this input. Upon deactivation, a high-tone chime is generated.
High Tone — Applying an active high (+28 VDC) to this pin causes a single high tone to sound. After the sound completes, audio returns to the previous state. The pin must be deactivated before another tone can be sounded.
Low Tone — Applying an active high (+28 VDC) to this pin causes a single low tone to sound. After the sound completes, audio returns to the previous state. The pin must be deactivated before another tone can be sounded.
Ring — Pulling this discrete input pin to power ground (<0.7 V) causes a telephone-like ringing tone to sound for approximately
2 seconds followed by an off period of approximately 4 seconds
This tone continues until the pin is deactivated. Upon deactivation, audio returns to the previous state. During the
Ring off period, any cockpit chimes that become active will be generated.
Document # 540343, Rev A, 08/2007 Page 7 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
2.5 Typical Application—Block Diagram
Document # 540343, Rev A, 08/2007 Page 8 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
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-9075-301-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 twelve (12) 0.188 in. diameter mounting holes (6 on each end).
3.1.6 This unit is capable of being mounted in any orientation whether horizontal, vertical, inverted, or at an angle.
Document # 540343, Rev A, 08/2007 Page 9 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
3.2 Unpacking and Inspection
3.2.1 Carefully open the packaging and remove the PA-9075-301-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 speakers 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.
Document # 540343, Rev A, 08/2007 Page 10 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
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.
3.4.3 Grounding / Bonding
All power input and power ground connections to the unit must be
22AWG (minimum) wiring. Power circuit ground shall be referenced to pins 18, 19, 20, 21, 22, 23, & 24 of connector J1.
Chassis ground is referenced to the power ground pins on connector J1. A grounding stud is provided.
3.4.4 Power Interruption
The electronics internal to the unit are capable of maintaining full normal operation during power interruptions not greater than
200msec. The power amp output of this device will not withstand a
200msec dropout.
3.4.5 Product Wire Bundle and Supply Harness Wire Type / Gauge
The PA-9075-301-x can consume 20 Amps (maximum), so for proper operation of this device, all six (6) power supply wires must use 20 AWG (minimum) MIL-W-22759. Circuit/chassis ground connection shall be bonded to an electrically conductive chassis mounting point or frame ground with less than 0.1 O resistance using less than 50 O impedance cable.
All multiple and/or differential signal connections (i.e., analog audio,
AES3 digital audio, RS-485 data bus communication, etc) are recommended to use 22AWG (minimum) shielded twisted pair or shielded three-conductor as necessary in accordance with NEMA
WC 27500 or equivalent.
Document # 540343, Rev A, 08/2007 Page 11 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
3.5 Electrical Characteristics
3.5.1 Electrical Specifications, PA-9075-301-x:
Electrical
PA
Interface
Maximum Power
Nominal Power
Operating Range
Microphone Bias
Micropho ne Inputs
Briefer Audio
20.
0 A @ +28 VDC
1.00 @ +28 VDC
+18 to +32 VDC
36mA@12VDC (nominal)
Unbalanced, 10KO input impedance; 3.5 V
RMS
max input; 30 dB max gain
Balanced, 10 kO input impedance; 3.5 V
RMS
max input; 30 dB max gain
Digital Entertainment
Audio in
AES-3 Digital audio
Amplifier
Analog Entertainment
Audio in
Analog PA Audio
Output
Digital PA Audio
Output
Mic Sidetone Outputs
Class T audio amplifier
Output Power
Balanced, 10 kO input impedance; 3.5 V
RMS
max input; 30 dB max gain
Balanced, 600 O (min) output impedance;7 V
RMS
(max) drive
Balanced, 110-ohm (nom) output impedance
AES-3 Digital audio
7 V
RMS
(max) drive
20 Hz – 20 kHz
75W
RMS
x 6 Channelsp
3.5.2 This unit incorporates an RS-485 serial data bus interface for communication purposes to other network-connected devices.
3.5.3 This device has three (3) selectable ID inputs providing the capability to have eight (8) units per installation.
3.5.4 An LED is provided for each amplifier section that will light to indicate when the applicable amp is in the ON state. Additional
LEDs give indication of a fault condition, i.e. thermal overload, amplifier overload, and other fault conditions. See Section 6.0 for details.
Document # 540343, Rev A, 08/2007 Page 12 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
3.5.5 Active and inactive states for each Discrete Interface input are defined below as follows:
Microphone PTT Keys
Briefer Key
GND (< 3.5V) (x 3)
GND (<0.7V)
PA Key Output Open collector GND, 150 mA (max) drive
Weight On Wheels causes cabin audio levels to decrease by an amount set by configuration of the PA-9075-301during initial installation. Factory default configuration is –6dB.
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-9075-301-1
PA-9075-301-2
PA-9075-301-1
PA-9075-301-2
J1
J1
J2
J2
RD37F10JVL0 (Positronic Industries)
DCMA-37S
RD50F10JVL0 (Positronic Industries)
DDMA-50S
Document # 540343, Rev A, 08/2007 Page 13 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
3.7 Pinout Assignment Descriptions
Pin
1
2
3
4
Description
Left Channel Amplifier Hi-Pass Output +
Left Channel Amplifier Hi-Pass Output -
Left Channel Amplifier Lo-Pass Output +
Left Channel Amplifier Lo-Pass Output -
5
6
7
Rt Channel Amplifier Hi-Pass Output +
Rt Channel Amplifier Hi-Pass Output -
Rt Channel Amplifier Lo-Pass Output +
8
9
Rt Channel Amplifier Lo-Pass Output -
Mono Channel Full Range Output 0 +
10 Mono Channel Full Range Output 0 –
11 Mono Channel Full Range Output 1 +
12 Mono Channel Full Range Output 1 –
13 Left Channel Analog Input +
14 Left Channel Analog Input -
15 Analog Input Shield
16 Rt Channel Analog Input +
17 Rt Channel Analog Input -
18 +28 VDC Common
19 +28 VDC Common
J1
Pin Description
20 +28 VDC Common
21 +28 VDC Common
22 +28 VDC Common
23 +28 VDC Common
24 +28 VDC Common
25 +28 VDC Main
26 +28 VDC Main
27 +28 VDC Main
28 +28 VDC Main
29 +28 VDC Main
30 +28 VDC Main
31 Emergency +28 VDC
32 Emergency +28 VDC
33 Reserved
34 Reserved
35 AES3 Input +
36 AES3 Input -
37 AES3 Input Common
J2
4
5
6
7
Pin
1
2
3
Description
ID 0 Active Lo Input
ID 1 Active Lo Input
ID 2 Active Lo Input
Briefer Input +
Pilot’s MIC Input +
Co-Pilot’s MIC Input +
Cabin MIC Input +
8
9
PA Chimes Output +
Pilot’s Chime Output +
10 Co-Pilot’s Chime Output +
11 Pilot’s Sidetone Output +
12 Co-Pilot’s Sidetone Output +
13 Databus RS485 A
14 AES3 Output +
15 Cockpit Chime Inhibit Active Lo Input
16 Cockpit Chime Active Lo Input
17 PA Key OUT Common
18 Two Tone 1 Active HI Input
19 Lo Tone Active HI Input
20 Briefer Shield
21 Pilot’s MIC Input -
22 Co-Pilot’s MIC Input -
23 Cabin MIC Input -
24 PA Chimes Shield
25 Pilot’s Chime Shield
Pin Description
26 Co-Pilot’s Chime Shield
27 Pilot’s Sidetone Shield
28 Co-Pilot’s Sidetone Shield
29 Databus Shield
30 AES3 OUT Shield
31 Weight On Wheels Active Lo Input
32 Briefer Key Active Lo Input
33 PA KEY OUT 0 (Open Collector)
34 Two Tone 0 Active HI Input
35 Hi Tone Active HI Input
36 Active HI Input Common
37 Briefer Input -
38 Pilot’s PTT Active Lo Input
39 Co-Pilot’s PTT Active Lo Input
40 Cabin PTT Active Lo Input
41 PA Chime Output -
42 Pilot’s Chime Output -
43 Co-Pilot’s Chime Output -
44 Pilot’s Sidetone Output -
45 Co-Pilot’s Sidetone Output -
46 Databus RS485 B
47 AES3 Output -
48 Ring Tone Active Lo Input
49 Active Lo Input Common
50 PA Key Output 1 (Open Collector)
Document # 540343, Rev A, 08/2007 Page 14 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
4.0 Instructions for Continued Airworthiness
4.1 Airworthiness Limitations
No periodic scheduled maintenance or calibration is required for continued airworthiness of the PA-9075-301-x. If the unit fails to perform to specifications, it must be removed and serviced by a qua lified 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.
5.0
Specifications
Physical Specifications – PA-9075-301-x
Weight
Dimensions
(l x w x h)
Approx. 2.32 lb / 1.05 kg
9.3" x 4.9" x 2.0"
24 cm x 12 cm x 5.1 cm
Document # 540343, Rev A, 08/2007 Page 15 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
6.0 Reference Drawings
The following diagrams show the unit dimensions, mounting locations, and connector locations for the PA-9075-301-x.
Document # 540343, Rev A, 08/2007 Page 16 of 17
Audio International, Inc.
PA-9075-301-x Installation Manual
Document # 540343, Rev A, 08/2007 Page 17 of 17

Public link updated
The public link to your chat has been updated.
Advertisement
Key features
- Six-output Class T amplifier
- Accepts analog stereo and stereo AES-3 digital audio
- Analog PA microphone and briefer audio
- Generates chime and ring tones
- Operational control via RS-485 data bus and discrete inputs
- Six channels out @ 75 Watts/channel