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, 2012 NAV2 AUX1 AUX2 IC S MUTE MUS IC R ADIO SQ 1 VOL TEL PULL MUSIC VOL C OP ILO T Revision D
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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.
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.
Aviation Limited Warranty All Garmin avionics products are warranted to be free from defects in materials or workmanship for: one years from the date of purchase for new Remote-Mount and Panel-Mount products; one year from the date of purchase for new portable products and any purchased newly-overhauled products; six months for newly-overhauled products exchanged through a Garmin Authorized Service Center; and 90 days for factory repaired or newly-overhauled products exchanged at Garmin in lieu of repair.
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TABLE OF CONTENTS PARAGRAPH PAGE Section 1 GENERAL DESCRIPTION .............................................................1-1 1.1 Introduction...................................................................................................................... 1-1 1.2 Equipment Description .................................................................................................... 1-1 1.3 Technical Specifications ...................................................................................
LIST OF FIGURES FIGURE PAGE Section 1 GENERAL DESCRIPTION .............................................................1-1 Figure 1-1. GMA 240 Unit View.......................................................................................... 1-1 Section 2 INSTALLATION OVERVIEW........................................................2-1 Figure 2-1 ESD Caution Logo ..............................................................................................
LIST OF TABLES TABLE PAGE Section 1 GENERAL DESCRIPTION .............................................................1-1 Table 1-1 Table 1-2 Table 1-3 Table 1-4 Physical Characteristics........................................................................................ 1-2 Electrical Characteristics ...................................................................................... 1-3 Power Requirements.............................................................................................
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1 GENERAL DESCRIPTION 1.1 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.
1.2.
1.3.2 Electrical Characteristics Table 1-2 Electrical Characteristics Characteristic Specification Temperature Range -20 C to +55 C (operation) -55 C to +85 C (storage) Altitude 55,000 Feet Dedicated Transceiver inputs: 3 (including TEL) Dedicated Receiver inputs: 4 (all independently selectable) Alert (unswitched) inputs: 3 (each with configurable volume) Audio Panel Functions Input impedance: 500 Ω Input isolation: 60 dB minimum Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.
Table 1-2 Electrical Characteristics Characteristic 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 Functions Music distortion: <0.1% THD+N (typ.
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 Installation Materials 2.2.
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 0Ω 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.
Table 2-1 Configuration Jumpers Component Name Only Primary COM mutes MUSIC R0314 Default Description 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.
Figure 2-2 Access Hole Locations (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.
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.
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 2-3 shows the GMA 340 unit rack. See Section 3.4 for installation instructions. NOTE Rear support is recommended to ensure a sturdy mount.
3 INSTALLATION PROCEDURE 3.1 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.
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.
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.
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.
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 Table 4-1, Table 4-2, and Appendix B.
Table 4-1 J2401 Pin Assignments Pin Pin Name I/O 8 AUX2 AUDIO IN LO -- 9 COM 1 AUDIO IN HI IN 10 COM 1 AUDIO LO -- 11 COM 1 MIC AUDIO OUT HI OUT 12 COM 1 MIC KEY* OUT OUT 13 COM 2 AUDIO IN HI IN 14 COM 2 AUDIO LO -- 15 COM 2 MIC AUDIO OUT HI 16 MASQ INHIBIT* IN IN 17 NAV 1 AUDIO IN HI IN 18 NAV 1 AUDIO IN LO -- 19 NAV 2 AUDIO IN HI IN 20 NAV 2 AUDIO IN LO -- 21 AUX1 AUDIO IN HI IN 22 AUX1 AUDIO IN LO -- 23 RESERVED -- 24 RESERVED -- 25 RESERVED -- 26
4.2.
Table 4-2 J2402 Pin Assignments Pin Pin Name I/O 36 PASS 1 MIC AUDIO IN LO -- 37 PASS 2 MIC AUDIO IN HI IN 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) 4.2.3 P2403 Connector (front panel 2.5 mm mini-jack) Figure 4-3 2.
4.3.2 Lighting Bus The GMA 240 can be configured to track a 14 or 28 Vdc lighting bus using these inputs. These inputs must be connected to a supply voltage (in the appropriate voltage range) for the backlighting to function. Refer to Figure B-1 for lighting interconnections. Backlighting refers only to the lighting of the text labels on the front panel and is controlled by the inputs in the below table.
4.5 Audio Inputs/Outputs and Mic Keys 4.5.
4.5.
4.5.6 Failsafe Warning Audio Table 4-12 Failsafe Warning Audio Pin Connector 29 P2402 4.5.7 Pin Name FAILSAFE WARN AUDIO IN HI Description I/O Failsafe Warning Audio Input IN Music Inputs Table 4-13 Music Inputs Pin Connector 23 P2402 MUSIC 1 IN LEFT 24 P2402 MUSIC 1 IN RIGHT 25 P2402 MUSIC 1 IN LO Ground Reference for Music 1 -- 26 P2402 MUSIC 2 IN LEFT Music 2 Input IN 27 P2402 MUSIC 2 IN RIGHT 28 P2402 MUSIC 2 IN LO 4.5.
4.5.
Figure 4-4 Audio Jack Wiring 4.5.10 COM Swap Table 4-16 COM Swap Pin Connector Pin Name 20 P2402 COM SWAP* IN Ground Through a Momentary PB Switch to Swap Active COM (COM 1 or COM 2) IN 21 P2402 COM SWAP RETURN Return Path for PB Switch -- GMA 240 Installation Manual Page 4-10 Description I/O 190-00917-01 Rev.
APPENDIX A Outline and Installation Drawings J2401 J2402 Figure A-1 GMA 240 Outline Drawing 190-00917-01 Revision D GMA 240 Installation Manual Page A-1
APPENDIX A Outline and Installation Drawings J2401 J2402 Figure A-2 GMA 240 Connector/Rack Assembly Drawing 190-00917-01 Revision D GMA 240 Installation Manual Page A-2
APPENDIX A Outline and Installation Drawings Figure A-3 GMA 240 Recommended Panel Cutout Dimensions 190-00917-01 Revision D GMA 240 Installation Manual Page A-3
APPENDIX B Interconnect Drawings Figure B-1 GMA 240 Interconnect Drawing (page 1 of 3) 190-00917-01 Revision D GMA 240 Installation Manual Page B-1
PLUGGING A MONAURAL HEADSET INTO A STEREO JACK SHORTS THE RIGHT CHANNEL OUTPUT TO GROUND. THIS CAUSES EXCESS CURRENT TO BE DRAWN AND MAY DAMAGE THE GMA 240. STEREO HEADSETS ARE RECOMMENDED IF STEREO JACKS ARE INSTALLED. INSTALLATIONS USING ONLY MONO HEADSETS MAY USE A STEREO AUDIO JACK AND LEAVE THE RING CONTACT UNCONNECTED OR INSTALL A SWITCH AS SHOWN BELOW. ALSO NOTE THAT MANY STEREO HEADSETS HAVE A MONO/STEREO SWITCH TO BE COMPATIBLE WITH MONO OR STEREO-WIRED JACKS.
APPENDIX B Interconnect Drawings 10. IF PINS 5, 6, & 7 ARE NOT CONNECTED IN THE 14V OR 28V CONFIGURATION, BACKLIGHTING WILL NOT FUNCTION (NO BACKLIGHTING).
APPENDIX B Interconnect Drawings GMA240 J2401 14 15 13 11 12 COM 2 MIC COM 2 AUDIO COM 2 AUDIO LO IN HI AUDIO OUT HI COM 1 MIC COM 1 AUDIO COM 1 AUDIO AUDIO OUT HI LO IN HI COM 1 MIC KEY* OUT 8 7 6 AUX2 AUDIO IN LO AUX2 AUDIO IN HI RESERVED 9 10 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 AUX
APPENDIX C Configuration Jumpers Drawing Top of Main Board Bottom of Main Board Figure C-1 GMA 240 Internal ConfigurationJumper Layout Drawing 190-00917-01 Revision D GMA 240 Installation Manual Page C-1
