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Summary of Contents for Garmin GMA 240
- Page 1 Installation Manual MUS IC OFF/ P ILO T 190-00917-01 GMA 240 C OM1 C OM2 NAV1 MUTE C OM1 C OM2 P ILOT TE L IS O June, 2008 GMA 240 NAV2 AUX1 AUX2 IC S MUTE MUS IC PULL...
- Page 2 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...
- Page 3 California's Proposition 65. If you have any questions or would like additional www.garmin.com/prop65. Table of Contents Appendix A Appendix B Appendix C GMA 240 Installation Manual 190-00917-01 WARNING information, please refer DOCUMENT PAGINATION Section Page Range i –...
- Page 4 This page intentionally left blank Page ii GMA 240 Installation Manual Revision A 190-00917-01...
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Page 5: Table Of Contents
1.4 Reference Documents ...1-4 1.5 Limited Warranty...1-5 INSTALLATION OVERVIEW ...2-1 2.1 Introduction...2-1 2.2 Installation Materials ...2-1 2.3 GMA 240 Wiring, Configuration, and Adjustment Options ...2-1 2.4 Noise ...2-5 2.5 GMA 240 Mounting ...2-6 INSTALLATION PROCEDURE...3-1 3.1 Unpacking Unit...3-1 3.2 Electrical Connections ...3-1 3.3 Audio Shield Termination ...3-2... -
Page 6: Paragraph Page
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 GMA 240 Installation Manual Revision A 190-00917-01... - Page 7 B-1 GMA 240 Interconnect Drawing (page 2 of 3)... B-3 B-1 GMA 240 Interconnect Drawing (page 3 of 3)... B-5 B-2 GMA 240, J2401 & J2402 Connector Layout Drawing ... B-7 C-1 GMA 240 Internal Configuration Jumper Layout Drawing ... C-1 TABLE 3-1 Recommended Crimp Tools ...3-1...
- Page 8 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.
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Page 9: General Description
P/N 190-00917-00. 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. -
Page 10: Technical Specifications
Rack Width Depth Behind Panel with Connectors (measured from face of aircraft panel to rear of connector backshells) GMA 240 Weight (Unit Only) GMA 240 Weight (Installed with rack and connectors) Page 1-2 Rev. A Specification 1.30 inches (33 mm) 6.29 inches (159.77 mm) - Page 11 Telephone interfaces: 1 full-duplex (use LRU pins or front jack) Headphone Outputs Output amplifiers: 2 stereo (pilot, copilot/passengers) Fidelity: Compatible with higher headphone impedances, those shown are for worst-case distortion and bandwidth GMA 240 Installation Manual 190-00917-01 Specification Ω MASQ™ processing (Master Avionics Squelch) Configurable button push aural annunciation Ω...
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Page 12: Reference Documents
Characteristic Input Voltage Range Power Input 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 190-00917-00 190-00917-02 Page 1-4 Rev. -
Page 13: Limited Warranty
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. - Page 14 Blank Page Page 1-6 GMA 240 Installation Manual Rev. A 190-00917-01...
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Page 15: Installation Overview
INSTALLATION OVERVIEW 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. - Page 16 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.
- Page 17 R0300 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. Alert 1 Volume 2. Alert 2 Volume 3. Alert 3 Volume 4. Rear connector TEL input volume 5.
- Page 18 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 GMA 240 Installation Manual Rev. A 190-00917-01...
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Page 19: Noise
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 Page 2-5 190-00917-01 Rev. A... -
Page 20: Gma 240 Mounting
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. -
Page 21: Installation Procedure
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. -
Page 22: Audio Shield Termination
4. Turn the Allen wrench clockwise until the unit is secured in the rack. Continue turning until tight, but do not over-tighten. Do not use excessive force when inserting the GMA 240 into the rack. This may damage the connectors, unit, and/or unit rack. -
Page 23: Post Installation Checkout
Post Installation Checkout 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. -
Page 24: Configuration Adjustments
This completes the in-aircraft post installation checkout. Perform a flight test after installing the unit to ensure satisfactory performance of the audio functions. 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. CONTINUED AIRWORTHINESS Maintenance of the GMA 240 is “on condition”... -
Page 25: System Interconnects
4 SYSTEM INTERCONNECTS 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 Figure 4-1. Rear View of Backplate and Rack Pin List Figure 4-2. - Page 26 PASS HEADSET AUDIO OUT RIGHT PASS HEADSET AUDIO OUT LO ALERT 2,3 AUDIO IN LO ALERT 2 AUDIO IN HI * Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active) Page 4-2 Rev. A GMA 240 Installation Manual 190-00917-01...
- Page 27 PASS 1 MIC AUDIO IN LO PASS 2 MIC AUDIO IN HI PASS 2 MIC AUDIO IN LO RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED * Denotes Active Low (Inputs: ground to activate; Outputs: grounded when active) GMA 240 Installation Manual 190-00917-01 Page 4-3 Rev. A...
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Page 28: Aircraft Power And Lighting
Connector P2402 P2402 P2402 P2402 4.3.2 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. Connector P2402 P2402 P2402 Page 4-4 Rev. A... -
Page 29: Configuration Pins
ENABLE* P2402 MUTE ON COM TX* * Denotes Active Low (Ground to activate) GMA 240 Installation Manual 190-00917-01 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. -
Page 30: Audio Inputs/Outputs And Mic Keys
COM 1 Audio Input COM 1 Audio Output Ground Reference for COM 1 COM 2 Audio Input COM 2 Audio Output Ground Reference for COM 2 Description Description in the intercom Description GMA 240 Installation Manual 190-00917-01... - Page 31 MUSIC 1 IN LO P2402 MUSIC 2 IN LEFT P2402 MUSIC 2 IN RIGHT P2402 MUSIC 2 IN LO GMA 240 Installation Manual 190-00917-01 Pin Name Alert 1 Audio Input Ground Reference for Alert 1 Alert 2 Audio Input Alert 3 Audio Input Ground Reference for Alert 2 &...
- Page 32 Ground Through a Momentary PB Switch to Swap Active COM (COM 1 or COM 2) Return Path for PB Switch Description Description Pilot Headset Audio Output Copilot Headset Audio Output Passenger Headset Audio Output Description GMA 240 Installation Manual 190-00917-01...
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Page 33: Appendix A Outline And Installation Drawings
APPENDIX A OUTLINE AND INSTALLATION DRAWINGS Figure A-1. GMA 240 Outline Drawing GMA 240 Installation Manual Page A-1 (Page A-2 blank) 190-00917-01 Rev A... - Page 34 APPENDIX A OUTLINE AND INSTALLATION DRAWINGS Figure A-2. GMA 240 Connector/Rack Assembly Drawing GMA 240 Installation Manual Page A-3 (Page A-4 blank) 190-00917-01 Rev A...
- Page 35 APPENDIX A OUTLINE AND INSTALLATION DRAWINGS Figure A-3. GMA 240 Recommended Panel Cutout Dimensions GMA 240 Installation Manual Page A-5 (Page A-6 blank) 190-00917-01 Rev A...
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Page 36: Appendix B Interconnect Drawings
APPENDIX B INTERCONNECT DRAWINGS Figure B-1. GMA 240 Interconnect Drawing (page 1 of 3) GMA 240 Installation Manual Page B-1 (Page B-2 blank) 190-00917-01 Rev A... - Page 37 APPENDIX B INTERCONNECT DRAWINGS Figure B-1. GMA 240 Interconnect Drawing (page 2 of 3) GMA 240 Installation Manual Page B-3 (Page B-4 blank) 190-00917-01 Rev A...
- Page 38 APPENDIX B INTERCONNECT DRAWINGS Figure B-1. GMA 240 Interconnect Drawing (page 3 of 3) GMA 240 Installation Manual Page B-5 (Page B-6 blank) 190-00917-01 Rev A...
- Page 39 PASS 1 MIC COPILOT MIC COPILOT MIC AUDIO IN LO AUDIO IN HI AUDIO IN LO KEY* IN Figure B-2. GMA 240, J2401 & J2402 Connector Layout Drawing RESERVED RESERVED NAV 1 AUDIO MASQ IN HI INHIBIT* IN ALERT 1...
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Page 40: Appendix C Configuration Jumpers Drawing
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 Page C-1 (Page C-2 blank) 190-00917-01 Rev A...
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