Installation manual | Garmin GMA 240 Stereo Receiver User Manual

GMA 240
Installation Manual
GMA 240
MUS IC
1
2
SQ
OFF/
VOL
P ILO T
190-00917-01
1-2
C OM1
C OM2
C OM1
MIC
C OM2
MIC
MON
NAV1
TE L
P ILOT
IS O
MUTE
June, 2008
NAV2
AUX1
AUX2
IC S
MUTE MUS IC
R ADIO
SQ
1
VOL
TEL
PULL
MUSIC
VOL
C OP ILO T
Revision A
© Copyright 2008
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied,
transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without
the express prior written consent of Garmin. Garmin hereby grants permission to download a
single copy of this manual and of any revision to this manual onto a hard drive or other electronic
storage medium to be viewed and to print one copy of this manual or of any revision hereto,
provided that such electronic or printed copy of this manual or revision must contain the complete
text of this copyright notice and provided further that any unauthorized commercial distribution
of this manual or any revision hereto is strictly prohibited.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: 913.397.8200
Aviation Panel-Mount Technical Support Line (Toll Free) 1.888.606.5482
www.garmin.com
Garmin (Europe) Ltd.
Liberty House, Bulls Copse Road
Hounsdown Business Park
Southampton, SO40 9RB U.K.
+44/ (0) 870.8501241
Garmin AT, Inc.
2345 Turner Rd., SE
Salem, OR 97302 USA
Telephone: 503.581.8101
RECORD OF REVISIONS
Revision
A
Page A
Rev. A
Revision Date
06/09/08
Initial Release
Description
GMA 240 Installation Manual
190-00917-01
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration Regulations
("EAR") issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and
which may not be exported, released, or disclosed to foreign nationals inside or outside of the United
States without first obtaining an export license. The preceding statement is required to be included on
any and all reproductions in whole or in part of this manual.
WARNING
This product, its packaging, and its components contain chemicals known to the State
of California to cause cancer, birth defects, or reproductive harm. This Notice is being
provided in accordance with California's Proposition 65. If you have any questions or
would like additional information, please refer to our web site at
www.garmin.com/prop65.
DOCUMENT PAGINATION
Section
Table of Contents
Section 1
Section 2
Section 3
Section 4
Appendix A
Appendix B
Appendix C
GMA 240 Installation Manual
190-00917-01
Page Range
i – vi
1-1 – 1-6
2-1 – 2-6
3-1 – 3-4
4-1 – 4-8
A-1 – A-6
B-1 – B-8
C-1 – C-2
Page i
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This page intentionally left blank
Page ii
Revision A
GMA 240 Installation Manual
190-00917-01
TABLE OF CONTENTS
PARAGRAPH
PAGE
1
1.1
1.2
1.3
1.4
1.5
GENERAL DESCRIPTION..............................................................................................................1-1
Introduction........................................................................................................................................1-1
Equipment Description ......................................................................................................................1-1
Technical Specifications ....................................................................................................................1-2
Reference Documents ........................................................................................................................1-4
Limited Warranty...............................................................................................................................1-5
2
2.1
2.2
2.3
2.4
2.5
INSTALLATION OVERVIEW ........................................................................................................2-1
Introduction........................................................................................................................................2-1
Installation Materials .........................................................................................................................2-1
GMA 240 Wiring, Configuration, and Adjustment Options .............................................................2-1
Noise ..................................................................................................................................................2-5
GMA 240 Mounting ..........................................................................................................................2-6
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
INSTALLATION PROCEDURE......................................................................................................3-1
Unpacking Unit..................................................................................................................................3-1
Electrical Connections .......................................................................................................................3-1
Audio Shield Termination .................................................................................................................3-2
GMA 240 Installation ........................................................................................................................3-2
Post Installation Checkout .................................................................................................................3-3
Configuration Adjustments................................................................................................................3-4
Continued Airworthiness ...................................................................................................................3-4
4
4.1
4.2
4.3
4.4
4.5
SYSTEM INTERCONNECTS..........................................................................................................4-1
Connector Description .......................................................................................................................4-1
Pin List...............................................................................................................................................4-1
Aircraft Power and Lighting ..............................................................................................................4-4
Configuration Pins .............................................................................................................................4-5
Audio Inputs/Outputs and Mic Keys .................................................................................................4-6
GMA 240 Installation Manual
190-00917-01
Page iii
Revision A
PARAGRAPH
PAGE
APPENDIX A OUTLINE AND INSTALLATION DRAWINGS.......................................................... A-1
APPENDIX B INTERCONNECT DRAWINGS .................................................................................... B-1
APPENDIX C CONFIGURATION JUMPER DRAWINGS.................................................................. C-1
Page iv
Revision A
GMA 240 Installation Manual
190-00917-01
LIST OF ILLUSTRATIONS
FIGURE
1-1
2-1
3-1
3-2
4-1
4-2
A-1
A-2
A-3
B-1
B-1
B-1
B-2
C-1
PAGE
GMA 240 Unit View .........................................................................................................................1-1
GMA 240 Unit Rack (115-00262-00) ...............................................................................................2-4
Audio Shield Termination .................................................................................................................3-2
Access Hole Location (Top View) ....................................................................................................3-5
Backshell Rear Connector Plate.........................................................................................................4-1
Rear Connectors J2401 & J2402, Viewed from Back of Unit...........................................................4-1
GMA 240 Outline Drawing .............................................................................................................. A-1
GMA 240 Connector/Rack Assembly Drawing ............................................................................... A-3
GMA 240 Recommended Panel Cutout Dimensions ....................................................................... A-5
GMA 240 Interconnect Drawing (page 1 of 3)................................................................................. B-1
GMA 240 Interconnect Drawing (page 2 of 3)................................................................................. B-3
GMA 240 Interconnect Drawing (page 3 of 3)................................................................................. B-5
GMA 240, J2401 & J2402 Connector Layout Drawing ................................................................... B-7
GMA 240 Internal Configuration Jumper Layout Drawing ............................................................. C-1
LIST OF TABLES
TABLE
PAGE
3-1 Recommended Crimp Tools ..............................................................................................................3-1
4-1 J2401 Pin Assignments......................................................................................................................4-2
4-2 J2402 Pin Assignments......................................................................................................................4-3
GMA 240 Installation Manual
190-00917-01
Page v
Revision A
GMA 240 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GMA 240 Audio
Panel. Mod Levels are listed with the associated service bulletin number, service bulletin date, and the
purpose of the modification. The table is current at the time of publication of this manual (see date on
front cover) and is subject to change without notice. Authorized Garmin Sales and Service Centers are
encouraged to access the most up-to-date bulletin and advisory information on the Garmin Dealer
Resource web site at www.garmin.com using their Garmin-provided user name and password.
MOD
LEVEL
Page vi
Revision A
SERVICE
BULLETIN
NUMBER
SERVICE
BULLETIN
DATE
PURPOSE OF MODIFICATION
GMA 240 Installation Manual
190-00917-01
1
1.1
GENERAL DESCRIPTION
Introduction
This manual provides the installation instructions for the Garmin GMA 240 Audio Panel. Reference to
GMA 240 throughout this manual refers to all versions of the unit. Information pertaining to the
maintenance of the unit can be found in the GMA 240 Maintenance Manual, P/N 190-00917-02.
Information pertaining to the operation of the unit can be found in the GMA 240 Pilot’s Guide,
P/N 190-00917-00.
1.2
Equipment Description
The Garmin GMA 240 Audio Panel is not a TSO-certified product and has received no FAA approval or
endorsement.
The GMA 240 meets the needs of aircraft owners and operators who require reliability and versatility in
the essential audio switching function. LED-illuminated push-button simplicity and intuitive panel layout
allow audio selection of both NAV and COM audio. Large, single-button activation of the COM
microphone and audio for two COM transceivers simplifies cockpit workload. Photocell dimming
circuitry automatically adjusts the brightness of the annunciators to a level appropriate for ambient
cockpit light. A fail-safe circuit connects the pilot’s headset and microphone directly to COM1 and a failsafe warning audio input in the event that power is interrupted or the unit is turned off.
Additionally, the GMA 240 includes a four-position intercom (ICS) with electronic cabin noise deemphasis, two stereo music inputs, and independent pilot and copilot/passenger volume controls. To
further simplify the cockpit workload, the intercom provides for pilot isolation. One hundred percent
solid state circuitry and extensive use of surface mount technology are employed.
Figure 1-1. GMA 240 Unit View
GMA 240 Installation Manual
190-00917-01
Page 1-1
Rev. A
1.2.1
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Features Summary
User-friendly, intuitive front panel layout
LEDs indicate selected function
Four position intercom: pilot, copilot, two passengers
Two stereo headset amplifiers: one for pilot, one for copilot/passengers
Two differential stereo music source inputs
Front panel music volume control, source selection, and master music on/off switch
Front panel controls for music muting by intercom and selected radios
Two selectable intercom operational modes
Selectable aural pushbutton annunciation (beep)
Independent pilot, copilot/passenger intercom volume and squelch controls
Individual VOX circuits for each of four (4) mic inputs
Automatic selection of COM audio source when corresponding mic is selected
Memory of explicitly selected COM audio source(s) when changing COM mic selection
MASQ™ Processing with configurable mute threshold
COM swap function
PTT indication
Power-off fail-safe to connect Pilot PTT, mic, and Headset to COM 1 if unit is turned off
Power-off fail-safe warning audio input
Full duplex Telephone interface
Front Panel Mini-Jack (MP3 player, cellular phone, etc.)
1.3
Technical Specifications
1.3.1
Physical Characteristics
Characteristic
Specification
Bezel Height
1.30 inches (33 mm)
Bezel Width
6.29 inches (159.77 mm)
Rack Height (Dimple to Dimple)
1.33 inches (34 mm)
Rack Width
6.30 inches (160.02 mm)
Depth Behind Panel with Connectors
(measured from face of aircraft panel to rear
of connector backshells)
7.12 inches (181 mm)
GMA 240 Weight (Unit Only)
15.5 oz (440 g)
GMA 240 Weight (Installed with rack and
connectors)
24 oz (680 g)
Page 1-2
Rev. A
GMA 240 Installation Manual
190-00917-01
1.3.2
Electrical Characteristics
Characteristic
Temperature Range
Specification
-20°C to +55°C (operation)
-55°C to +85°C (storage)
Altitude
55,000 Feet
Audio Panel
Functions
Dedicated Transceiver inputs: 3 (including TEL)
Dedicated Receiver inputs: 4 (all independently selectable)
Alert (unswitched) inputs: 3 (each with configurable volume)
Input impedance: 500 Ω
Input isolation: 60 dB minimum
Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.5 kHz
Special functions: Fail-safe operation
MASQ™ processing (Master Avionics Squelch)
Configurable button push aural annunciation
Intercom Functions
Positions: 4 (pilot, copilot, 2 passengers)
Volume controls: 3 (pilot, copilot/passengers, music)
VOX level controls: 2 (pilot, copilot/passengers)
VOX circuits: 4 (one per mic input)
Microphone input impedance: 450 Ω (compatible with 150 to 600 Ω
mics)
Microphone bias voltage: about 10 Vdc delivered through 450 Ω
Microphone response: 9-pole characteristic cabin noise de-emphasis
Intercom isolation modes: 2 – all, pilot (or configure for all, crew)
Telephone interfaces: 1 full-duplex (use LRU pins or front jack)
Headphone Outputs
Output amplifiers: 2 stereo (pilot, copilot/passengers)
Fidelity:
Load
Power
Distortion (typ.)
150 Ω
50 mW
<0.03% THD+N
150 Ω
100 mW
<0.07% THD+N
50 Ω
150 mW
<0.07% THD+N
50 Ω
300 mW
<0.10% THD+N
Compatible with higher headphone impedances, those shown are for worst-case
distortion and bandwidth
GMA 240 Installation Manual
190-00917-01
Page 1-3
Rev. A
Characteristic
Music Functions
Specification
Music inputs (stereo): 2
Music input impedance: 600 Ω (differential)
Music gain: -20dB @ min volume, +26dB @ max. volume (typ.)
Music input level:<200 mVrms for full power* output @ max music
volume knob position (typ.)
3.5 Vrms max music input level
Music bandwidth: 20 Hz to 20 kHz @ full power output
Music distortion: <0.1% THD+N (typ.) @ full power, full bandwidth
Special Functions: Front panel selection and volume control
Front panel control for muting by radios and ICS
Muting by alerts configurable
*Full power output refers to 300 mW into 50 Ω (three 150 Ω headsets in parallel each
driven to 100 mW)
Front Panel MiniJack Functions
Input Impedance: 5.1 kΩ
Music Input: Auto detection of music source will use jack as Music 1
Telephone Input: Auto detection of TEL source will use jack for TEL
Telephone ring signal is heard without TEL selected
1.3.3
Power Requirements
Characteristic
Specification
Input Voltage Range
11 to 33 Vdc
Power Input
4.3 W normal operation (310mA @ 13.8 V)
7.5 W max. operation (540 mA @ 13.8 V)
1.4
Reference Documents
The following publications are sources of additional information for installing the GMA 240. Before
installing the unit, the technician should read all referenced materials along with this manual.
Part Number
Document
190-00917-00
GMA 240 Pilot’s Guide
190-00917-02
GMA 240 Maintenance Manual
Page 1-4
Rev. A
GMA 240 Installation Manual
190-00917-01
1.5
Limited Warranty
This Garmin product is warranted to be free from defects in materials or workmanship for one year from
the date of purchase. Within this period, Garmin will at its sole option, repair or replace any components
that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or
labor, provided that the customer shall be responsible for any transportation cost. This warranty does not
cover failures due to abuse, misuse, accident or unauthorized alteration or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF
ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY
LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU
SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR
INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not
allow the exclusion of incidental or consequential damages, so the above limitations may not apply to
you.
Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the
purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE
REMEDY FOR ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local Garmin Authorized Service Center. For assistance in
locating a Service Center near you, call Garmin Customer Service at one of the numbers shown below.
Products sold through online auctions are not eligible for rebates or other special offers from Garmin.
Online auction confirmations are not accepted for warranty verification. To obtain warranty service, an
original or copy of the sales receipt from the original retailer is required. Garmin will not replace missing
components from any package purchased through an online auction.
Garmin International, Inc.
1200 East 151st Street
Olathe, Kansas 66062, U.S.A.
Phone: 913/397.8200
FAX:
913/397.8282
GMA 240 Installation Manual
190-00917-01
Garmin (Europe) Ltd.
Liberty House, Bulls Copse Road
Hounsdown Business Park
Southampton, SO40 9RB, U.K.
Phone: +44/0870.851241
FAX:
+44/0870.851251
Page 1-5
Rev. A
Blank Page
Page 1-6
Rev. A
GMA 240 Installation Manual
190-00917-01
2
INSTALLATION OVERVIEW
2.1
Introduction
This section provides the necessary information for the installation and checkout of the GMA 240 Audio
Panel. Installation of the GMA 240 will differ according to equipment location and other factors.
Cabling will be fabricated by the installing agency to fit these various requirements. The appendices
contain interconnect wiring diagrams, mounting dimensions, and information pertaining to installation.
2.2
2.2.1
Installation Materials
Equipment Available
GMA 240 Audio Panel, Ship Level Assembly, P/N 010-00735-() includes the following, depending on
part number:
Item
2.2.2
•
•
•
2.3
Garmin P/N
Connector Kit, GMA 340
011-00652-00
Rack Backplate, GMA 340
011-00678-00
Unit Assembly, GMA 240
011-01988-00
Audio Cables, 2.5 mm RA Stereo Plug
011-02079-00
Install Rack, GMA 340
115-00262-00
Additional Equipment Required
Cables: The installer will fabricate and supply all system cables. Interconnect wiring diagrams
are detailed in Appendix B.
Hardware: #6-32 100° flat head screw (6 ea.) and #6-32 self-locking nut (6 ea.). Hardware
required to mount the installation rack is not provided.
Stereo headphone jacks (up to 4), microphone jacks (up to 4), 3.5mm stereo jacks (up to 2).
Insulating type jacks or insulating washers should be used for all jacks to isolate them from
aircraft chassis.
GMA 240 Wiring, Configuration, and Adjustment Options
The GMA 240 has several configuration/adjustment options, consideration of these options should be
discussed with the end user(s) of the aircraft before wiring begins. These configuration/adjustments are
described in the following sections:
•
•
•
Wiring options – Sections 2.3.1 and 4.4.1
Internal configuration jumpers - Section 2.3.1
Volume/Mute adjustments - Section 2.3.2
GMA 240 Installation Manual
190-00917-01
Page 2-1
Rev. A
2.3.1
Internal Configuration Jumpers
The following internal configuration adjustments may be made by removing or replacing jumpers on the
PCB. The jumper positions are designed to accept a 0 Ω resistor of 0603 size. Refer to Appendix C for
component location.
This service should only be performed by a qualified technician. Garmin is not responsible for damage
caused during adjustment of these internal configuration jumper settings. Refer to the GMA 240
Maintenance Manual for disassembly/reassembly instructions.
The GMA 240 contains static sensitive components. Observe proper anti-static
procedures when performing any solder procedures on the unit.
Component
Name
Default
Description
R0303
Alert Mutes
Music
Populated
If this jumper is removed, music will not be
interrupted by alert audio. Default operation
is recommended.
R0304
COM1 Internal
Sidetone
Empty
R0305
COM2 Internal
Sidetone
Empty
If a jumper is supplied in these positions,
internal sidetone will be heard during PTT to
simulate received sidetone from a radio that
does not provide one during transmission.
This should only be used if a radio does not
perform this function already.
R0308
TEL Internal
Sidetone
Populated
If this jumper is removed, intercom audio
and intercom sidetone will not be heard
when the TEL button is selected. Many
phones supply sidetone when a call is in
session. This causes a noticeable change in
intercom sound quality but it is usually not
disruptive. Default operation is
recommended unless the effect of sidetone
from the telephone is disruptive to intercom
operation.
R0315
TEL jack detect
bypass
Empty
If a jumper is supplied in this position, when
TEL is selected the audio panel will assume
a telephone is in use in the front jack
regardless of phone detection. This should
be used only if the audio panel is not
capable of properly detecting the telephone
that will be used in the installation.
Page 2-2
Rev. A
GMA 240 Installation Manual
190-00917-01
Component
Name
Default
Description
R0314
Only Primary
COM mutes
MUSIC
Empty
If a jumper is supplied in this position, the
RADIO button will mute music only when the
Primary COM (the COM selected for
transmission) is receiving audio. Default
RADIO mutes music operation occurs when
any selected COM / NAV / AUX radio is
receiving audio.
R0313
Enable KEYED
ICS
Empty
If a jumper is supplied in this position, the
intercom system (ICS) will only allow
intercom MIC audio to be heard when the
corresponding ICS KEY for the MIC position
is pressed. When this configuration is used,
the VOX knobs should be set fully CCW (live
MIC). See section 4.5.2 for information on
wiring intercom keys.
R0312
Reserved
Empty
Reserved
R0309
Reserved
Empty
Reserved
R0302
Reserved
Empty
Reserved
R0301
Reserved
Empty
Reserved
R0300
Reserved
Empty
Reserved
2.3.2
VOLUME/MUTE Configuration Adjustments
The following adjustments can be made through access holes in the top cover of the GMA 240:
1.
2.
3.
4.
5.
6.
Alert 1 Volume
Alert 2 Volume
Alert 3 Volume
Rear connector TEL input volume
Front panel jack TEL input volume
MASQ (Master Avionics SQuelch) mute level
Refer to Figure 2-1 for the location of the access holes.
CAUTION
Exercise care when inserting adjustment tools through the top cover.
Damage to the unit may occur if an adjustment tool is accidentally forced
against unintended components or circuit board paths. Use a 2 mm (max
blade width) flat-blade non-conductive screw driver or adjustment tool.
CW adjustment increases the levels for volume inputs and for the mute threshold for radio inputs.
GMA 240 Installation Manual
190-00917-01
Page 2-3
Rev. A
Figure 2-1. Access Hole Location (Top View)
2.3.3
Hardwire Configuration Option
The following configuration options are available by externally wiring pins to aircraft chassis. When
change of operation is desired during flight, these can optionally be wired to chassis through a suitable
switch mounted in reach of the operator. See Section 4.4.1 for connector and pin details for
implementing these configuration options.
MASQ™ INHIBIT: The Master Avionics SQuelch inhibit configuration option allows selected avionics
audio inputs (COM, NAV, AUX) and alerts to be heard even if they do not exceed the MASQ threshold.
This increases background noise during otherwise quiet operation because noise from these inputs is not
squelched. This option is most useful as a troubleshooting tool.
CREW ISO: This input configures the audio panel for crew intercom isolation in place of pilot isolation.
When the PILOT ISO key is selected, the pilot and copilot will hear each other but will be isolated from
the passengers. When the CREW ISO configuration is selected, the copilot’s headphone jack must be
wired in parallel with the pilot headset output. Microphones are wired as normal.
PILOT ISO MUSIC: This input configures music to be heard by the pilot during PILOT ISO mode (or
by the pilot and copilot if crew isolate mode is configured). Normally, the isolated ICS positions do not
hear music.
Page 2-4
Rev. A
GMA 240 Installation Manual
190-00917-01
BUTTON PRESS TONE ENABLE: This input enables an audible tone to be heard when a button press
is detected.
MUTE ON COM TX: This input configures the audio panel to mute all selected radios (COM, NAV,
AUX) except the mic selected COM (COM selected for transmission) when a PTT key is activated for
COM transmit.
2.4
Noise
Because the audio panel is a point in the aircraft where signals from many pieces of equipment are
brought together, care must be taken to minimize effects from coupled interference and ground loops.
Coupled interference can sneak into audio system interconnecting cables when they are routed near large
AC electric fields, AC voltage sources, and pulse equipment (strobes, spark plugs, magnetos, EL displays,
CRTs, etc). Interference can also couple into audio system interconnecting cables by magnetic induction
when they are routed near large AC current-carrying conductors or switched DC equipment (heaters,
solenoids, fans, autopilot servos, etc).
Ground loops are created when there is more than one path in which return currents can flow, or when
signal returns share the same path as large currents from other equipment. These large currents create
differences in ground potential between the various equipment operating in the aircraft. These differences
in potential can produce an additive effect at an audio panel signal input.
The audio panel may “see” the desired input signal plus an unwanted component injected by ground
differentials, a common cause of alternator-related noise. This is the main reason why all audio jacks
should be isolated from ground. Terminating audio shields just at one end eliminates another potential
ground loop injection point.
Single-point grounding cannot be overstressed for the various avionics producing and processing audio
signals. Single-point, in this context, means that the various pieces of equipment share a single common
ground connection back to the airframe. Good aircraft electrical/charging system ground bonding is also
important.
The wiring diagrams and accompanying notes in this manual should be followed closely to minimize
noise effects.
GMA 240 Installation Manual
190-00917-01
Page 2-5
Rev. A
2.5
GMA 240 Mounting
The GMA 240 mounting surface must be capable of providing structural support and electrical bond to
the aircraft to minimize radiated EMI and provide protection from High-Intensity Radiation Fields
(HIRF).
The GMA 240 is mounted using a GMA 340 unit rack. Figure 2-2 shows the GMA 340 unit rack. See
Section 3.4 for installation instructions.
NOTE
Rear support is recommended to ensure a sturdy mount.
Figure 2-2. GMA 340 Unit Rack (115-00262-00)
Page 2-6
Rev. A
GMA 240 Installation Manual
190-00917-01
3
3.1
INSTALLATION PROCEDURE
Unpacking Unit
Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred
during shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the
original shipping container and all packing materials. Do not return the unit to Garmin until the carrier
has authorized the claim.
Retain the original shipping containers for storage. If the original containers are not available, a separate
cardboard container should be prepared that is large enough to accommodate sufficient packing material
to prevent movement.
3.2
Electrical Connections
All electrical connections to the GMA 240 are made through two 44-pin D-subminiature connectors (see
Figure 3-1). Section 4 defines the electrical characteristics of all input and output signals. Required
connector and associated hardware are supplied in the connector kit (P/N 011-00652-00). See Appendix
B for interconnect wiring diagrams.
Check wiring connections for errors before inserting the GMA 240 into the rack. Incorrect wiring could
cause internal component damage.
Table 3-1. Pin Contact Part Numbers
Manufacturer
22-28 AWG
Garmin P/N
Military P/N
AMP
Positronic
ITT Cannon
336-00021-00
M39029/58-360
204370-2
MC8522D
030-2042-000
Table 3-2. Recommended Crimp Tools
Manufacturer
Hand
Crimping Tool
Military P/N
Positronic
ITT Cannon
AMP
Daniels
Astro
M22520/2-01
9507
995-0001-584
601966-1
AFM8
615717
High Density 20-28 AWG
Insertion/
Positioner
Extraction Tool
M22520/2-09
9502-3
995-0001-739
601966-6
K42
615725
M81969/1-04
M81969/1-04
N/A
91067-1
M81969/1-04
M81969/1-04
NOTE
1. Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject
to change without notice.
2. Extracting the #16, #18 and #20 contact requires that the expanded wire barrel be cut off from
the contact. It may also be necessary to push the pin out from the face of the connector when
using an extractor due to the absence of the wire. A new contact must be used when
reassembling the connector.
3. For applications using 16 AWG wire, contact Garmin for information regarding connector
crimp positioner tooling.
GMA 240 Installation Manual
190-00917-01
Page 3-1
Rev. A
3.3
Audio Shield Termination
The audio shield wires should be terminated at the rear of the unit to the screws between J2401 and J2402
as shown in Figure 3-1.
Rear View of backplate and rack
J2402
J2401
Audio shields daisy chained and
terminated using a lug attached to
either of these screws.
Figure 3-1. Audio Shield Termination
3.4
GMA 240 Installation
NOTE
Avoid installing the unit near heat sources. If this is not possible, ensure
that additional cooling is provided. Allow adequate space for installation
of cables and connectors. The installer will supply and fabricate all of
the cables.
1. Assemble the connector/rack kit according to Tables 4-1, 4-2; and Figures B-1 and B-2. Install
the rack assembly according to the dimensions given in Figures A-1 and A-3. Mounting brackets
are not supplied due to the wide range of mounting configurations available. Suitable mounting
brackets may be fabricated from sheet metal or angle stock. To ensure a sturdy mount, rear
support for the unit should be provided.
2. Slide the unit into the rack until the jackscrew makes contact with the receptacle located in the
back plate.
3. Insert a 3/32” Allen wrench into the jackscrew access hole on the faceplate.
4. Turn the Allen wrench clockwise until the unit is secured in the rack. Continue turning until
tight, but do not over-tighten.
CAUTION
Do not use excessive force when inserting the GMA 240 into the rack.
This may damage the connectors, unit, and/or unit rack. If heavy
resistance is felt during installation, stop, and remove the GMA 240 and
identify the source of resistance.
5. To remove the unit from the rack, turn the Allen wrench counterclockwise until it disengages
from the rack.
Page 3-2
Rev. A
GMA 240 Installation Manual
190-00917-01
3.5
Post Installation Checkout
CAUTION
Check wiring connections for errors before inserting the GMA 240 into
the rack. Incorrect wiring could cause internal component damage.
An in-aircraft checkout may be performed in the aircraft on the ramp with known good microphone,
headset, and avionics receivers.
3.5.1
Lamp Test
1. Apply power to the unit by rotating the pilot intercom knob clockwise.
2. Verify that all annunciators on the front panel are illuminated during initial power up.
3.5.2
Failsafe Operation Check
1. Turn the unit off by rotating the pilot intercom knob fully counter clockwise.
2. Check the failsafe operation by exercising the COM 1 microphone, microphone key, and monitoring
received COM 1 audio over the pilot headphone’s left earpiece.
3. If installed, check that the failsafe warning is heard in the pilot headphone’s left earpiece.
4. Turn the unit back on to continue testing.
3.5.3
Transceiver Operational Check
1. Perform a ramp test radio check by exercising the installed transceivers, microphone, microphone
key, and audio over the headphone.
2. Verify that communications are loud and clear and PTT operation is correct.
3.5.4
Intercom System (ICS) Check
NOTE
Stereo headsets are recommended if stereo jacks are installed.
Alternatively, the installation should employ stereo jacks with a
mono/stereo switch that disconnects the audio panel’s right channel
output from the jack’s ring contact when in mono mode. If a monaural
headset is used in a stereo jack, the audio panel’s right channel output is
shorted to ground by the mono headset’s plug. This causes excess power
supply current to be drawn. While this does not damage the unit’s output
circuitry, prolonged periods (especially at high volume) may cause the
internal power input fuse to open. This is because the unit is optimized
for low-power operation in systems with limited power budgets. In the
case of copilot/passenger positions wired in parallel, any stereo listener
will lose right channel audio when another passenger plugs in a mono
headset.
1. Set the intercom to the ALL mode [Pilot ISO LED off.]
GMA 240 Installation Manual
190-00917-01
Page 3-3
Rev. A
2. Plug in headsets at each ICS position.
NOTE
For helicopter operation using a two-stage Intercom/PTT switch, prior to
using the keyed-intercom mode, the VOX level should be set by
adjusting the VOX knob while the first detent is actuated and held.
3. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch
controls.
3.5.5
Aircraft Receivers Check
1. Select the audio source corresponding to each installed avionics unit and check for audio over the
headsets.
3.5.6
Music System Check
1. Set the intercom to the ALL mode [Pilot ISO LED off.]
2. Connect a stereo audio source to MUSIC 1 (ensure the front panel jack is empty and the music
volume knob is not set to minimum). Verify that stereo audio is heard over all headset positions
when MUSIC 1 is selected as the music source and MUSIC LED is on. Pull out on the right side
small knob and verify that music volume adjustment is working properly.
3. Select an audio source to COM 1 and verify that the sound is muted by active COM 1 audio when
RADIO music mute is selected and by intercom audio when ICS music mute is selected.
4. Connect a stereo music source to MUSIC 2. Verify that stereo audio is heard when MUSIC 2 is
selected as the music source and MUSIC LED is on.
5. Connect a stereo audio source to the front panel jack. Verify that stereo audio is heard when
MUSIC 1 is selected as the music source and MUSIC LED is on.
CAUTION
Be sure to check all aircraft control movements before flight is attempted
to ensure that the wiring harness does not touch any moving part.
This completes the in-aircraft post installation checkout. Perform a flight test after installing the unit to
ensure satisfactory performance of the audio functions.
3.6
CONFIGURATION ADJUSTMENTS
Adjustment to the Volume and Squelch settings can be made to the GMA 240 through access holes in the
unit’s top cover. Refer to Section 2.3 for details.
3.7
CONTINUED AIRWORTHINESS
Maintenance of the GMA 240 is “on condition” only. Refer to the GMA 240 Maintenance Manual
(Garmin P/N 190-00917-02) as needed. Periodic maintenance of the GMA 240 is not required.
Instructions for Continued Airworthiness (ICA) are not required for this product under 14 CFR Part 21
since the GMA 240 has received no FAA approval or endorsement.
Page 3-4
Rev. A
GMA 240 Installation Manual
190-00917-01
4 SYSTEM INTERCONNECTS
4.1
Connector Description
The GMA 240 has two 44-pin connectors located at the rear of the unit designated J2401 and J2402
which are oriented as shown in Figure 4-1.
J2402
J2401
Figure 4-1. Rear View of Backplate and Rack
4.2
Pin List
Figure 4-2. Rear Connectors J2401 & J2402, Viewed from Back of Unit
J2401 and J2402 pins are configured as shown in Figure 4-2. J2401 and J2402 pin assignments are given
in Tables 4-1, 4-2, and Appendix B.
Following the pin assignment tables (Tables 4-1 & 4-2), additional tables group pin connections by
function.
An asterisk (*) following a signal name denotes that the signal is active low logic. Active low inputs are
connected to ground to activate. Active low outputs sink current to ground when active.
GMA 240 Installation Manual
190-00917-01
Page 4-1
Rev. A
4.2.1
P2401 Connector
Table 4-1. J2401 Pin Assignments
Pin Pin Name
1
RESERVED
2
RESERVED
3
TEL AUDIO IN HI
4
TEL AUDIO LO
5
TEL MIC AUDIO OUT HI
6
RESERVED
7
AUX2 AUDIO IN HI
8
AUX2 AUDIO IN LO
9
COM 1 AUDIO IN HI
10
COM 1 AUDIO LO
11
COM 1 MIC AUDIO OUT HI
12
COM 1 MIC KEY* OUT
13
COM 2 AUDIO IN HI
14
COM 2 AUDIO LO
15
COM 2 MIC AUDIO OUT HI
16
MASQ INHIBIT* IN
17
NAV 1 AUDIO IN HI
18
NAV 1 AUDIO IN LO
19
NAV 2 AUDIO IN HI
20
NAV 2 AUDIO IN LO
21
AUX1 AUDIO IN HI
22
AUX1 AUDIO IN LO
23
RESERVED
24
RESERVED
25
RESERVED
26
RESERVED
27
RESERVED
28
RESERVED
29
CREW ISO* IN
30
COM 2 MIC KEY* OUT
31
ALERT 1 AUDIO IN HI
32
ALERT 1 AUDIO IN LO
33
PILOT MIC AUDIO IN HI
34
PILOT MIC KEY* IN
35
PILOT MIC AUDIO IN LO
36
RESERVED
37
RESERVED
38
RESERVED
39
RESERVED
40
PASS HEADSET AUDIO OUT LEFT
41
PASS HEADSET AUDIO OUT RIGHT
42
PASS HEADSET AUDIO OUT LO
43
ALERT 2,3 AUDIO IN LO
44
ALERT 2 AUDIO IN HI
* Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
Page 4-2
Rev. A
I/O
--IN
-OUT
-IN
-IN
-OUT
OUT
IN
-OUT
IN
IN
-IN
-IN
-------IN
OUT
IN
-IN
IN
-----OUT
OUT
--IN
GMA 240 Installation Manual
190-00917-01
4.2.2
J2402 Connector
Table 4-2. J2402 Pin Assignments
Pin Pin Name
1
PILOT HEADSET AUDIO OUT LO
2
COPILOT HEADSET AUDIO OUT LO
3
COPILOT HEADSET AUDIO OUT LEFT
4
COPILOT HEADSET AUDIO OUT RIGHT
5
LIGHTING BUS 14V LO/28V LO
6
LIGHTING BUS 14V HI/28V LO
7
LIGHTING BUS 14V HI/28V HI
8
AIRCRAFT POWER
9
AIRCRAFT POWER
10
AIRCRAFT GROUND
11
AIRCRAFT GROUND
12
RESERVED
13
PILOT ISO MUSIC* IN
14
PILOT ISO MUSIC* RETURN
15
ALERT 3 AUDIO IN HI
16
PILOT HEADSET AUDIO OUT LEFT
17
RESERVED
18
RESERVED
19
BUTTON PRESS TONE ENABLE* IN
20
COM SWAP* IN
21
COM SWAP* IN RETURN
22
RESERVED
23
MUSIC 1 IN LEFT
24
MUSIC 1 IN RIGHT
25
MUSIC 1 IN LO
26
MUSIC 2 IN LEFT
27
MUSIC 2 IN RIGHT
28
MUSIC 2 IN LO
29
FAILSAFE WARN AUDIO IN HI
30
MUTE ON COM TX* IN
31
PILOT HEADSET AUDIO OUT RIGHT
32
COPILOT MIC AUDIO IN HI
33
COPILOT MIC KEY* IN
34
COPILOT MIC AUDIO IN LO
35
PASS 1 MIC AUDIO IN HI
36
PASS 1 MIC AUDIO IN LO
37
PASS 2 MIC AUDIO IN HI
38
PASS 2 MIC AUDIO IN LO
39
RESERVED
40
RESERVED
41
RESERVED
42
RESERVED
43
RESERVED
44
RESERVED
* Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active)
I/O
--OUT
OUT
-IN
IN
IN
IN
---IN
-IN
OUT
--IN
IN
--IN
IN
-IN
IN
-IN
IN
OUT
IN
IN
-IN
-IN
--------
GMA 240 Installation Manual
190-00917-01
Page 4-3
Rev. A
4.2.3
P2403 Connector (front panel 2.5 mm mini-jack)
Figure 4-2. 2.5 mm plug used with P2403
Pin
TIP
RING
SLEEVE
4.3
Pin Name
I/O
MUSIC 1 LEFT IN/TEL MIC OUT HI
MUSIC 1 RIGHT IN/TEL AUDIO IN HI
MUSIC 1 LO IN/TEL AUDIO LO
IN/OUT
IN
--
Aircraft Power and Lighting
4.3.1
Aircraft Power
The GMA 240 has four inputs for aircraft power bus inputs of 14/28Vdc.
Pin
8
9
10
11
4.3.2
Connector
P2402
P2402
P2402
P2402
Pin Name
AIRCRAFT POWER
AIRCRAFT POWER
POWER GROUND
POWER GROUND
I/O
IN
IN
---
Lighting Bus
The GMA 240 can be configured to track a 14 or 28 Vdc lighting bus using these inputs. Refer to Figure
B-1 for lighting interconnections.
Pin
5
6
7
Page 4-4
Rev. A
Connector
P2402
P2402
P2402
Pin Name
LIGHTING BUS 14V LO/28V LO
LIGHTING BUS 14V HI/28V LO
LIGHTING BUS 14V HI/28V HI
I/O
-IN
IN
GMA 240 Installation Manual
190-00917-01
4.4
4.4.1
Configuration Pins
External Configuration Pins
The following pins may be used to change the configuration of the installation as described.
Pin
16
Connector Pin Name
P2401
MASQ
INHIBIT*
IN
29
P2401
13
P2402
CREW
ISO* IN
Description
Ground to disable Master Avionics Squelch circuitry. This
will cause alerts and selected radios to be heard at all times
without needing to exceed the mute threshold. This causes
an increase in background noise from the inputs during quiet
output.
Ground to configure the unit for CREW ICS isolation. In this
configuration, the copilot headset jack should be wired in
parallel with the pilot headset output. The mics are wired as
normal. In this mode, when the PILOT ISO button is
selected, the pilot and copilot will hear each other, but will be
intercom isolated from the passengers.
Ground to allow Music audio to be heard by the pilot during
pilot isolate mode.
Ground to enable beep tone annunciation of button presses
PILOT ISO
MUSIC* IN
19
P2402
BUTTON
PRESS
TONE
ENABLE*
IN
30
P2402
MUTE ON Ground to enable muting of other selected radios during mic
COM TX*
selected COM transmission (mic-selected COM is still heard,
IN
but not other selected radios)
* Denotes Active Low (Ground to activate)
GMA 240 Installation Manual
190-00917-01
Page 4-5
Rev. A
4.5
Audio Inputs/Outputs and Mic Keys
4.5.1
Mic Audio Inputs and Mic Keys
Pin Connector
Pin Name
34
P2401
PILOT MIC KEY* IN
33
P2402
COPILOT MIC KEY* IN
33
P2401
PILOT MIC AUDIO IN HI
35
P2401
PILOT MIC IN LO
32
P2402
COPILOT MIC AUDIO IN HI
34
P2402
COPILOT MIC IN LO
35
P2402
PASS 1 MIC AUDIO IN HI
36
P2402
PASS 1 MIC AUDIO IN LO
37
P2402
PASS 2 MIC AUDIO IN HI
38
P2402
PASS 2 MIC AUDIO IN LO
*Denotes Active Low (Ground to activate)
4.5.2
Description
Enables respective MIC audio into
the selected transceiver unit
Pilot Mic audio input and ground
reference
Copilot Mic audio input and ground
reference
Passenger 1 Mic audio and ground
reference
Passenger 2 Mic audio and ground
reference
I/O
IN
IN
IN
-IN
-IN
-IN
--
Intercom Key Inputs (if configured)
These inputs only perform the described ICS KEY function if the audio panel has been configured for
KEYED ICS by configuration jumper settings (see Section 2.3.1). For this configuration, intercom
squelch levels should be set fully CCW (live MIC) because the MIC signal must also break the VOX
threshold to be heard.
Pin Connector
Pin Name
17
P2402
PILOT ICS KEY* IN
36
P2401
COPILOT ICS KEY* IN
37
P2401
PASSENGER ICS KEY* IN
*Denotes Active Low (Ground to activate)
4.5.3
Description
Enables respective mic audio to be heard
in the intercom
COM Audio and Mic Keys
Pin Connector
Pin Name
Description
12
P2401
COM 1 MIC KEY* OUT
Enables transmission on the
respective transceiver unit
30
P2401
COM 2 MIC KEY* OUT
9
P2401
COM 1 AUDIO IN HI
COM 1 Audio Input
11
P2401
COM 1 MIC AUDIO OUT HI COM 1 Audio Output
10
P2401
COM 1 AUDIO LO
Ground Reference for COM 1
13
P2401
COM 2 AUDIO IN HI
COM 2 Audio Input
15
P2401
COM 2 MIC AUDIO OUT HI COM 2 Audio Output
14
P2401
COM 2 AUDIO LO
Ground Reference for COM 2
* Denotes Active Low (Sinks current to ground when active)
Page 4-6
Rev. A
I/O
OUT
OUT
IN
OUT
-IN
OUT
--
GMA 240 Installation Manual
190-00917-01
4.5.4
Pin
31
32
44
15
43
4.5.5
Pin
21
22
7
8
17
18
19
20
4.5.6
Pin
29
4.5.7
Pin
23
24
25
26
27
28
Alert Audio I/O
Connector
P2401
P2401
P2401
P2402
P2401
Pin Name
ALERT 1 AUDIO IN HI
ALERT 1 AUDIO IN LO
ALERT 2 AUDIO IN HI
ALERT 3 AUDIO IN HI
ALERT 2,3 AUDIO IN LO
Description
Alert 1 Audio Input
Ground Reference for Alert 1
Alert 2 Audio Input
Alert 3 Audio Input
Ground Reference for Alert 2 & 3
I/O
IN
-IN
IN
--
AUX and NAV Audio Inputs
Connector
P2401
P2401
P2401
P2401
P2401
P2401
P2401
P2401
Pin Name
AUX1 AUDIO IN HI
AUX1 AUDIO IN LO
AUX2 AUDIO IN HI
AUX2 AUDIO IN LO
NAV 1 AUDIO IN HI
NAV 1 AUDIO IN LO
NAV 2 AUDIO IN HI
NAV 2 AUDIO IN LO
Description
AUX1 Audio Input
Ground Reference for AUX1 Input
AUX2 Audio Input
Ground Reference for AUX2 Input
NAV 1 Audio Input
NAV 1 Ground Reference
NAV 2 Audio Input
NAV 2 Ground Reference
I/O
IN
-IN
-IN
-IN
--
Failsafe Warning Audio
Connector
P2402
Pin Name
FAILSAFE WARN AUDIO IN HI
Description
Failsafe Warning Audio Input
I/O
IN
Music Inputs
Connector
P2402
P2402
P2402
P2402
P2402
P2402
Pin Name
MUSIC 1 IN LEFT
MUSIC 1 IN RIGHT
MUSIC 1 IN LO
MUSIC 2 IN LEFT
MUSIC 2 IN RIGHT
MUSIC 2 IN LO
GMA 240 Installation Manual
190-00917-01
Description
Music 1 Input
Ground Reference for Music 1
Music 2 Input
Ground Reference for Music 2
I/O
IN
IN
-IN
IN
--
Page 4-7
Rev. A
4.5.8
Tel Audio I/O
Pin
3
4
5
Connector
P2401
P2401
P2401
4.5.9
Pin
16
31
1
3
4
2
40
41
42
Pin Name
TEL AUDIO IN HI
TEL AUDIO LO
TEL MIC AUDIO OUT HI
Description
Telephone Audio Input
Ground Reference for Telephone
TEL MIC Audio Output
I/O
IN
-OUT
Headset Outputs
Connector
P2402
P2402
P2402
P2402
P2402
P2402
P2401
P2401
P2401
Pin Name
PILOT HEADSET AUDIO OUT LEFT
PILOT HEADSET AUDIO OUT RIGHT
PILOT HEADSET AUDIO OUT LO
COPILOT HEADSET AUDIO OUT LEFT
COPILOT HEADSET AUDIO OUT RIGHT
COPILOT HEADSET AUDIO OUT LO
PASS HEADSET AUDIO OUT LEFT
PASS HEADSET AUDIO OUT RIGHT
PASS HEADSET AUDIO OUT LO
Description
Pilot Headset Audio
Output
Copilot Headset Audio
Output
Passenger Headset
Audio Output
I/O
OUT
OUT
-OUT
OUT
-OUT
OUT
--
NOTE
Copilot and Passenger headset outputs are internally the same
connection. Separate Passenger headset output pins are provided for
wiring convenience and GMA 340 pin compatibility.
NOTE
For CREW ISO configuration, the copilot’s headphone jack should be
wired in parallel with the pilot jack to the Pilot headset output pins.
Passengers may be connected to either the copilot or passenger pins.
4.5.10
COM Swap
Pin
20
Connector
P2402
21
P2402
Page 4-8
Rev. A
Pin Name
COM SWAP* IN
COM SWAP RETURN
Description
Ground Through a Momentary PB
Switch to Swap Active COM (COM 1
or COM 2)
Return Path for PB Switch
I/O
IN
--
GMA 240 Installation Manual
190-00917-01
APPENDIX A OUTLINE AND INSTALLATION DRAWINGS
Figure A-1. GMA 240 Outline Drawing
GMA 240 Installation Manual
190-00917-01
Page A-1 (Page A-2 blank)
Rev A
APPENDIX A OUTLINE AND INSTALLATION DRAWINGS
Figure A-2. GMA 240 Connector/Rack Assembly Drawing
GMA 240 Installation Manual
190-00917-01
Page A-3 (Page A-4 blank)
Rev A
APPENDIX A OUTLINE AND INSTALLATION DRAWINGS
Figure A-3. GMA 240 Recommended Panel Cutout Dimensions
GMA 240 Installation Manual
190-00917-01
Page A-5 (Page A-6 blank)
Rev A
APPENDIX B INTERCONNECT DRAWINGS
Figure B-1. GMA 240 Interconnect Drawing (page 1 of 3)
GMA 240 Installation Manual
190-00917-01
Page B-1 (Page B-2 blank)
Rev A
APPENDIX B INTERCONNECT DRAWINGS
Figure B-1. GMA 240 Interconnect Drawing (page 2 of 3)
GMA 240 Installation Manual
190-00917-01
Page B-3 (Page B-4 blank)
Rev A
APPENDIX B INTERCONNECT DRAWINGS
Figure B-1. GMA 240 Interconnect Drawing (page 3 of 3)
GMA 240 Installation Manual
190-00917-01
Page B-5 (Page B-6 blank)
Rev A
APPENDIX B INTERCONNECT DRAWINGS
GMA240 J2401
14
15
13
COM 2 MIC COM 2 AUDIO COM 2 AUDIO
LO
IN HI
AUDIO OUT HI
10
11
12
COM 1 MIC COM 1 AUDIO COM 1 AUDIO
LO
IN HI
AUDIO OUT HI
COM 1 MIC
KEY* OUT
8
7
6
AUX2 AUDIO
IN LO
AUX2 AUDIO
IN HI
RESERVED
9
5
4
2
1
RESERVED
RESERVED
3
TEL MIC
TEL AUDIO LO TEL AUDIO IN
AUDIO OUT HI
HI
30
29
28
27
26
25
24
23
22
21
20
19
COM 2 MIC
KEY* OUT
CREW ISO* IN
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
AUX1 AUDIO
IN LO
AUX1 AUDIO
IN HI
NAV 2 AUDIO
IN LO
NAV 2 AUDIO
IN HI
18
16
17
NAV 1 AUDIO NAV 1 AUDIO
IN LO
IN HI
MASQ
INHIBIT* IN
44
43
42
41
40
39
38
37
36
35
34
33
32
31
ALERT 2
AUDIO IN HI
ALERT 2,3
AUDIO IN LO
PASS
HEADSET
AUDIO OUT
LO
PASS
HEADSET
AUDIO OUT
RIGHT
PASS
HEADSET
AUDIO OUT
LEFT
RESERVED
RESERVED
RESERVED
RESERVED
PILOT MIC
AUDIO IN LO
PILOT MIC
KEY* IN
PILOT MIC
AUDIO IN HI
ALERT 1
AUDIO IN LO
ALERT 1
AUDIO IN HI
6
LIGHTING
BUS 14V
HI/28V LO
5
LIGHTING
BUS 14V
LO/28V LO
2
COPILOT
HEADSET
AUDIO OUT
LO
1
PILOT
HEADSET
AUDIO OUT
LO
GMA240 J2402
14
PILOT ISO
MUSIC*
RETURN
15
ALERT 3
AUDIO IN HI
13
PILOT ISO
MUSIC* IN
29
30
MUTE* ON
COM TX IN
11
AIRCRAFT
GROUND
12
RESERVED
7
LIGHTING
BUS 14V
HI/28V HI
8
AIRCRAFT
POWER
9
AIRCRAFT
POWER
4
COPILOT
HEADSET
AUDIO OUT
RIGHT
3
COPILOT
HEADSET
AUDIO OUT
LEFT
27
26
25
24
23
22
21
20
19
18
MUSIC 2 IN
RIGHT
MUSIC 2 IN
LEFT
MUSIC 1 IN LO
MUSIC 1 IN
RIGHT
MUSIC 1 IN
LEFT
RESERVED
COM SWAP*
IN RETURN
COM SWAP*
IN
BUTTON
PRESS TONE
ENABLE* IN
RESERVED
28
MUSIC 2 IN LO
FAILSAFE
WARN AUDIO
IN HI
10
AIRCRAFT
GROUND
44
43
42
RESERVED
RESERVED
RESERVED
41
RESERVED
40
RESERVED
39
RESERVED
38
PASS 2 MIC
AUDIO IN LO
37
PASS 2 MIC
AUDIO IN HI
36
35
PASS 1 MIC
AUDIO IN LO
PASS 1 MIC
AUDIO IN HI
34
33
16
17
PILOT
HEADSET
AUDIO OUT
LEFT
RESERVED
32
COPILOT MIC COPILOT MIC COPILOT MIC
AUDIO IN HI
KEY* IN
AUDIO IN LO
31
PILOT
HEADSET
AUDIO OUT
RIGHT
Figure B-2. GMA 240, J2401 & J2402 Connector Layout Drawing
GMA 240 Installation Manual
190-00917-01
Page B-7 (Page B-8 blank)
Rev A
APPENDIX C CONFIGURATION JUMPERS DRAWING
Top of Main Board
Bottom of Main Board
Figure C-1. GMA 240, Internal Configuration Jumper Layout Drawing
GMA 240 Installation Manual
190-00917-01
Page C-1 (Page C-2 blank)
Rev A
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