Audio international PA-7500A Troubleshooting guide

Guide to Installation &
rL
Operations
Cabin Audio Amplifier
Model #: PA-7500A
Document #540056
7300 Industry Drive, North Little Rock, AR 72117
Phone: 501-955-2929 Fax: 501-955-2988
AUDIO INTERNATIONAL, INC.
10/97
Revision History
Rev. Level
Date
Description
Approved
IR
Applicable Documents
Document
#
Drawing
#
520754
Description
PA-7500A Outline Drawing
2
Document #540056, Rev. IR, Model No.: PA-7500A
Rev.
#
IR
AUDIO INTERNATIONAL, INC.
10/97
Service Bulletin List
Service
Bulletin #
Subject
Manual
Revision
#
Manual
Revision
Date
List of Illustrations
Section
No.
Description
3
Document #540056, Rev. IR, Model No.: PA-7500A
Page
No.
AUDIO INTERNATIONAL, INC.
10/97
Table of Contents
Section
Description
Page
1.0
1.1
1.2
1.3
1.4
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose of the Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5
5
5
5
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prior to Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cautions & Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pinouts / Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector / Mating Connector Information . . . . . . . . . . . . . . . . . . . . . . .
Post-Installation Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
6
6
7
7
8
8
8
9
9
3.0
3.1
3.2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading the Audio Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Control Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
9
9
4.0
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
5.0
5.1
5.2
Specification and Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applicable Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
10
10
9
4
Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
10/97
MODEL NO.
PA-7500A
Cabin Audio Amplifier
1.0
General Information
1.1
Introduction
This manual contains information for the installation and operation of the Audio
International, Inc. (AI) Cabin Audio Amplifier, Model No. PA-7500A
Information within this publication includes relative physical, mechanical, and
electrical characteristics. Also included within this publication are additional
references needed for installation and operation.
1.2
Purpose of the Equipment
The PA-7500A is an audio amplifier that takes low audio signal and magnifies it.
The audio amplifier can be utilized to form standard, basic building blocks that
can be arranged in almost any configuration for any size aircraft. The audio
amplifier is built to rugged aircraft standards and is easily incorporated into new
or existing cabin audio systems. It features compact size, solid state circuitry,
lightweight aluminum housing, and an attractive, durable anodized finish.
1.3
Operational Features
The PA-7500A is a professional cabin audio amplifier that delivers high
performance, excellent frequency response, and clear sound quality. This unit has
a small footprint and generates little heat yet it can produce dual output, highpower, high fidelity sound.
The PA-7500A will produce stereo audio output for the entertainment system and
monaural audio for page / chime. The amplifier is designed to interface with the
RS-485 data bus allowing all entertainment switch panels to communicate with
the audio amplifier
1.4
Optional Equipment
Audio International, Inc. carries a complete line of speaker systems to enhance
any aircraft entertainment system. As an industry leader in aviation entertainment
systems, Audio International, Inc. can offer the perfect combination for the
quietest listening and the highest quality in personal audio entertainment.
5
Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
2.0
10/97
Installation
2.1
Prior to Installation
The PA-7500A is a simple module to use and install. All audio input and output
cables on the units should be twisted shielded pair (20 AWG minimum, 16 – 18
preferred) unless otherwise specified. The module must be attached to conform to
the standards designated by the customer, installing agency, and existing
conditions as to the unit location and type of installation. The following should
be carefully considered before installing:
2.1.1 Select a mounting location for the unit. For best results, the unit must be
located as close to source equipment as possible. Long low-level runs
may introduce noise into the audio signal. Allow a minimum of ½ inch air
space around the amplifier due to the amount of heat generated by the unit.
Refer to section 5.0 for unit dimensions and mounting hole locations.
2.1.2 Select a mounting location where 28 VDC power and audio signal has
been previously installed.
2.1.3 The purpose of the audio amplifier is to compensate for low level audio
signals and “amplify” them to a high level. The amplifier will be most
effective when the interior is thoroughly furnished and all pieces of
furniture are in place
2.2
Unpacking and Inspection
2.2.1 Carefully open the packaging and remove the Amplifier. Inspect the unit
for damage. Retain the packing materials and packing list. Verify that all
components have been included in the package. The components should
arrive in good condition. However, occasionally damage does occur in
shipping.
If damage has occurred, a claim must be filed with AI within 24 hours
after unpacking and a “Return Request Authorization Number” must be
obtained from AI. Refer to the front cover of this manual for address and
telephone number of the Audio International, Inc. authorized dealership.
Repackage the unit in its original packaging materials and return it to AI
following instructions given. If no return is necessary, retain the packing
materials for storage or reshipment if necessary.
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Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
2.3
10/97
Cautions & Warnings
2.3.1 All audio connections to the PA-7500A should be shielded and properly
grounded. Perform a pin-to-pin check to confirm that all wires terminate in
their proper location. It is important to do a power and ground check on
the pin connections. Ensure that power and ground are applied only where
required.
2.3.2 DO NOT connect or disconnect the PA-7500A while power is applied.
2.3.3 DO NOT connect or disconnect any speaker when power is applied to the
amplifier.
2.3.4 DO NOT remove any factory-installed screws. Damage to the unit may
result and void any warranties.
2.4
Wiring Requirements
2.4.1 The installing agency must supply and fabricate all external cables. The
length and routing of external cables must 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.
2.4.2 All power and ground wires must be 18 AWG minimum. All input and
output lines require twisted, shielded cable with the cable shields
grounded. Power ground wires must be grounded within twelve (12)
inches of the unit. All wires must be in accordance with MIL-W-22759 or
equivalent. Twisted, shielded cable must be in accordance with MIL-W27500 or equivalent. Protect power wires with circuit breakers or fuses
located close to the electrical power source bus.
2.4.3 The PA-7500A is designed to interface with other AI equipment via the
RS-485 data bus. This is a bi-directional data bus that allows multiple
units to be connected simultaneously. The lines are daisy-chained
between units with 120-ohm resistors installed at both ends of the wiring
harness. Cable designed specifically for data bus use with 120-ohm
nominal impedance should be utilized. Contact AI for recommended
cables.
2.5
Physical Requirements
2.5.1 Refer to Section 5.1 for unit dimensions.
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Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
2.6
10/97
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
2
3
4
5
6
7
8
9
10
11
12
13
Left Speaker 1 - High
Left Speaker 2 – High
Left Speaker 1 – Low
Left Speaker 2 – Low
Woofer 1 – Low
28 VDC
28 VDC
28 VDC
Woofer 2 – Low
Right Speaker 1 – Low
Right Speaker 2 – Low
Right Speaker 1 – High
Right Speaker 2 – High
14
15
16
17
18
19
20
21
22
23
24
25
Woofer 1 – High
Emergency Bus 28 VDC In
28 VDC
28 VDC
Ground
Ground
Ground
Ground
Chassis Ground
Ground
Ground
Woofer 2 – High
8
Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
Pin #
10/97
Description
Pin #
Description
P2
1
2
3
4
5
6
7
8
9
10
11
12*
13*
14*
15
16
17
18
19
2.8
No Connection
PA MIC +
Wgt-On-Wheels Input (Ground)
Briefer +
No Connection
Left In +
Left In Right In +
Right In Data Bus Shield
+ 28 VDC (Adj)
Ground (Adj)
SER + (Adj)
SER – (Adj)
No Connection
No Connection
No Connection
No Connection
No Connection
*Serial Data Bus
20
21
22
23
24
25
26
27
28
29*
30*
31
32
33
34
35
36
37
PA MIC No Connection
Briefer No Connection
PA MIC Key
Briefer Key
+ PA Output
- PA Output
PA Key Out
SER Data +
SER Data Chime In (+28 VDC)
TT Chime In (+28 VDC)
Call In (Grnd)
Hook In (Grnd)
PA Sidetone +
High Tone
Low Tone
Connector / Mating Connector Information
Mating connector part numbers are as follows:
Pin #
2.9
Connector
Mating Connector
P1
SD25M10HVL0
SD25F10HVL0
P2
SD37M10HVL0
SD37F10HVL0
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.
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Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
10/97
2.9.3 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.
3.0
4.0
Operations
3.1
To operate the PA-7500A, load an audio source with selected material. Verify
that all of the audio inputs are available to the system and that selected audio
sources can be heard through the speaker system. All audio sources that interface
with this amplifier unit must be checked for proper operation. Use the switch
panel controls to verify that audio entertainment units are operating in a proper
manner.
3.2
Key and speak into a microphone and verify that the page / chime and briefer
overrides the entertainment audio. When a microphone key is activated, all other
audio source signals are overridden and PA audio should be present in the speaker
system.
Troubleshooting Guide
Problem
Possible Cause
No sound
PA-7500A is improperly
installed.
Solution
Verify 28 VDC power and audio
input is present
Contact AI for assistance
5.0
Specifications and Drawings
5.1
Amplifier Unit Specifications
Physical Specifications
Housing
Dimensions
Weight
Lightweight Aluminum
Length-8.8”, width-4.9”, height-2.0”
3.2 lbs.
Electrical Specifications
Power
Emergency Power
Data Bus Type
Electric Crossover
Channel Output Power
Minimum Load Impedance
Input Impedance
28 VDC @ continuous power output (2 channel)
28 VDC Page / Chime
RS-485
Audio Specifications
Low Range: 135 Hz
High Range: 135 Hz
4-Channel 100 Watts Peak Output
Maximum per Channel
4 Ω per Channel
10K Briefer, 1VRMS (nominal)
10
Document #540056, Rev. IR, Model No.: PA-7500A
AUDIO INTERNATIONAL, INC.
5.2
10/97
Applicable Drawings
5.2.1 The following diagram shows the unit dimensions and mounting hole
locations on the PA-7500A audio amplifier.
11
Document #540056, Rev. IR, Model No.: PA-7500A
Guide to Installation &
rL
Operations
Cabin Audio Amplifier
Model #: PA-7500A
Document #540056
Response Due By: 2/9/98
APPROVAL SYSTEM
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Released By:
Signature
Date
J. Roll, Ed Smith
Jeff Honeycutt
Lee Bailey
Mike Halter
Keith Satterfield
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Andrew Eros
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REVISION HISTORY
Rev. Level
IR
Date
Description
Initial Release
Approved