Garmin GMA 240 Installation Manual
Contents
1. LER LEE O 5 2402 A J2401 O O Figure 4 1 Rear View of Backplate and Rack 4 2 Pin List 15 S00000000000000 500 O 440 O O O O O O O O O O O Figure 4 2 Rear Connectors J2401 amp 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 Following the pin assignment tables Table 4 1 amp Table 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 4 2 1 P2401 Connector Table 4 1 J2401 Pin Assignments Pin Name RESERVED RESERVED TEL AUDIO IN HI TEL AUDIO LO TEL MIC AUDIO OUT HI RESERVED AUX2 AUDIO IN HI 190 0091 7 01 GMA 240 Installation Manual Rev D Page 4 1 A GARMIN Table 4 1 J2401 Pin Assignments Pin Pin Name AUX2 AUDIO IN LO COM 1 AUDIO IN HI COM 1 AUDIO LO COM 1 MIC AUDIO OUT HI COM 1 MIC KEY OUT COM 2 AUDIO IN HI COM 2 AUDIO LO COM 2 MIC AUDIO OUT HI MASQ INHIBIT IN NAV 1 AUDIO IN HI NAV 1 AUDIO IN LO NAV 2 AUDIO IN HI NAV 2 AUDIO IN LO AUX1 AUDI2. u aaa RERS 3 1 HA Electrical ossi u that Das ecu usa Re 3 1 3 3 Audio Shield Termination 3 2 3 4 GMA 240 Mata AKEN ae 3 2 3 5 Post Installation Checkout 3 3 3 6 Configuration Adjustments ood donas educ tta 3 4 3 7 Continued XI SOT HANGS n RAO qu Ci Rae uk cul pH Ren 3 4 Section 4 SYSTEM INTERCONNECTIT S 4 1 4 1 Connector Descriptio sssi 4 1 Lu bas 4 1 4 3 Aircraft PO Wer and Lighting ANGAS ABA 4 4 4 4 Configuration Pins AA OMM DURER UE PRA 4 5 4 5 Audio Inputs Outputs and Mic Keys duane 4 6 Appendix A Outline and Installation Drawinss A 1 Appendix B Interconnect Drawinss B 1 Appendix C Configuration Jumpers C 1 190 00917 01 GMA 240 Installation Manual Rev D Page v A GARMIN LIST OF FIGURES FIGURE PAGE Section 1 GENERAL DESCRIPTION 1 1 Figu
3. NI OSI 01 INO 13SQV3H SSVd INO 1350 3 SSVd 1431 100 1350 3 SSVd S 3LON 335 VW9 ANOHd SSVd 310N 335 zr 0 ov 10 24 2 GION 335 7 Move 3NOHd 1011402 eh or rh 01 INO 1350 3 1011409 1H9IM LNO L3SQV3H 1011402 1431 100 O1GNV 1350 3 1011402 INO l3SQV3H i LHOIW INO 1350 3 10114 H 1331 INO 13sQv3H 10714 core orz NOILVYNSIANOD WOOS3INI NOILVIOSI MINI LISOVIH 03193NNOO LONS 62 xOSI ALON 335 A 3NOHd Z Ssvd AN zy 01100 Ssvd L iw uno 13sQv3H ssve bel 1431 INO Oldnv 13SQV3H SSYd S 310N 335 Loved VW9 JON 335 01 INO Oldnv l3SQv3H 1011400 lt LNO Oldnv 1 1011409 AQT NOH Cs 1911809 1431 LNO 13SQv3H 1011402 INO 1 1014 18 100 1350 3 10114 3NOHd 1074 91 4437 INO 1 Ar 20764 02
4. GARMIN GMA 240 Installation Manual GMA 240 MUTE MUSIC nic sisa RADIO TeL MUSIC COPILOT 190 00917 01 June 2012 Revision D A 5 55 5 55 55 5 55 555 Copyright 2012 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 15 1st 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 Revision Date Description
5. 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 audio over the pilot headphone s left earpiece 3 Ifinstalled 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 e 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 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 lo
6. 15 WODYIILNI NOILYIOSI 1014 04 5 NI Oldnv SIN 55 4 IH NI SIN SSVd O1 NI Olanv L SSVd IH NI OIN SSVd 01 NI SIN 1011409 IH OIN 1011402 NI A33 1011402 VW9 ALON 335 NA se wove JIN Z SSYd g 1 9 DIN 1 SSWd SE 1011402 zs JIN 1071409 N ILON 335 101 Move DIN 1074 O1 NI Oldnv SIN 10114 IH NI OIN 10119 NI A39 OIN 10114 Otz VW9 Figure B 1 GMA 240 Interconnect Drawing page 2 of 3 GMA 240 Installation Manual 190 00917 01 Page B 2 D 15100 Rev APPENDIX B Interconnect Drawings NOTES 1 2 CONFIGURATION PINS ARE GROUNDED TO INITIATE THE LABELED FUNCTION ALL WIRE SHOULD BE 24 AWG OR LARGER TEFLON INSULATED UNLESS OTHERWISE INDICATED ALL SHIELDS MUST BE TERMINATED AT THE GMA 240 END ONLY DAISY CHAIN SHIELDS TO A SUITABLE RING TERMINAL AND ATTACH TO CENTER GROUNDING LUGS IN BACK OF CONNECTOR BACKPLATE ALL AUDIO JACKS USED IN THE INSTALLATION MUST BE ELECTRICALLY ISOLATED FROM CHASSIS TO AVOID GROUND LOOPS THIS MAY REQUIRE THE USE OF INSULATION WASHERS WHE
7. A394 OIN Z WOO lt IH INO OIN WOO ON MN3AISOSNVML Woo pa gt Ln WOO IH NI Z WOO INO A34 OIN L WOO lt LL IH INO OIN WOO ON N3AI3OSNV2IL WOO C Ds 01 2 S 3LON 33S 6 IH NI WOO uil NG N 190 00917 01 Revision D GARMIN APPENDIX B Interconnect Drawings NOILISOd LVHL 303 AINO M399 114 N3AIJOSNVMI AHL S31VALLOY 1N3130 ONOO3S 3Hl QNV AIN SO 3Hl S31VALLOV IN313G 15411 3Hl HOIHM NI SA3X 39VIS OMI 378lIVdWOO 0517 34V SINdANI AIN 591 4 INdINO 01 13SQV3H INdINO 13SQV3H TAINS 034315 INIT dll 1 1331 13SAY3H SOV 15 ONON 18 38 OL HOLIMS O3H31S ONOM V SL3SQV3H O3331S ANYW LYHL 10 OS TV M0738 NMOHS SV HOLIMS V TIVISNI GALOANNOONN LOVINOO JHL 3AV31 15 V ASN ST3SQV3H AINO ONISN SNOLIVTIVISNI GITIVLSNI 38V SHOW 15 SL3SQV3H 0394315 070 WWD IHL 39VINVO AYW 38 OL SS39X3 SASNVO SIHL OL LAdLNO TANNVHO LHOIY IHL SLYOHS 15 V OLNI L3SQV3H IYYNYNOW 9NI99 T Td 9 ALMMIGILVdNOD OVE VND 3ON3IN3ANOO 304 GINddNS 38V SNId 35 7070 VWO AHL 3QISNI NOILO3NNOO IWYS FHL
8. AIRCRAFT LIGHTING LIGHTING LIGHTING COPILOT COPILOT COPILOT PILOT AUDIO IN HI MUSIC MUSIC IN GROUND GROUND POWER POWER BUS 14V BUS 14V BUS 14V HEADSET HEADSET HEADSET HEADSET RETURN HI 28V HI HI 28VLO LO 28VLO AUDIO OUT AUDIO OUT AUDIO OUT AUDIO OUT RIGHT LEFT LO LO 30 29 28 26 25 23 21 20 19 18 17 16 MUTE ON FAILSAFE MUSIC2INLO MUSIC2IN MUSIC2IN MUSIC 1 INLO MUSIC1IN MUSIC1IN RESERVED COM SWAP COMSWAP BUTTON RESERVED RESERVED PILOT COM WARN AUDIO LEFT LEFT IN RETURN IN PRESS TONE HEADSET IN HI ENABLE IN AUDIO OUT LEFT 44 43 42 41 40 39 38 37 36 35 34 33 32 31 RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED PASS2MIC PASS2MIC PASS 1 MIC PASS 1 COPILOT MIC COPILOT MIC COPILOT PILOT AUDIO IN LO AUDIO INHI AUDIO INLO AUDIO INHI AUDIOINLO AUDIO INHI HEADSET AUDIO OUT RIGHT Figure B 2 GMA 240 J2401 amp J2402 Connector Layout Drawing 190 00917 01 Revision D GMA 240 Installation Manual Page B 4 APPENDIX C Configuration Jumpers Drawing Top of Main Board EN Nak Lj R0300 El Ro302 12 8 R0313 m RO314 no RO315 ws PILOT KONB of Main Board Front Left Corner A GARMIN Bottom of Main Board H j H T r 4 Hi H B H TI U u Pn Tm BREA H H T HBA 196 ul LLL Uu 1 tit f 16 Wo BE t a
9. COPILOT HEADSET AUDIO OUT LO PASS HEADSET AUDIO OUT LEFT PASS HEADSET AUDIO OUT RIGHT PASS HEADSET AUDIO OUT LO Pilot Headset Audio Output Copilot Headset Audio Output Passenger Headset Audio Output 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 e 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 Using mono headset with an audio jack wired for stereo may damage the GMA 240 Installations using only mono headsets may use a stereo audio jack and leave the ring contact unconnected or install a switch as shown in Figure 4 4 Also note that many stereo headsets have a mono stereo switch to be compatible with mono or stereo wired Jacks 190 0091 7 01 GMA 240 Installation Manual Rev D Page 4 9 GARMIN HEADSET LEFT OUTPUT DP MONO HEADSET RIGHT OUTPUT RING A STEREO LJ SLEEVE HEADSET LO OUTPUT Figure 4 4 Audio Jack Wiring 4 5 10 COM Swap Table 4 16 COM Swap Connector Pin Name Description Ground Through a Momentary PB COM SWAP IN Switch to Swap Active COM COM 1 or COM 2 COM SWAP RETURN Return Path for PB Switch GMA 240 In
10. E ME ag UE VOL VOL TEL VOL O l l MUTE LVL CO NG S l l 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 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
11. 06 09 08 Initial Release 01 18 11 Clarified backlighting info 04 13 11 Clarified mono stereo headset switch info D 06 16 12 Corrected temperature range spec GMA 240 Installation Manual 190 00917 01 Page A Rev D A GARMIN 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 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 Page Revision Number CURRENT REVISION DESCRIPTION Section Number Description of Change Correct temp range spec Removed 16 AWG wiring info updated Table 3 2 and wiring info Corrected description in Table 4 8 190 0091 7 01 Rev D Added connector numbers to drawings DOCUMENT PAGINATION Section Page Range
12. 65 9 OL SLOANNOD AIN S Q13HQNVH JHL SNId 01 WOO QNV IH INO OIGNV SIN WOOD S VW9 01 SIO3NNOO LNdNI JIN S QI3HQNVH JHL SNId WOO IH NI Olanv WOO S YWO OL 5123 02 O3331S AINO TINNVHO 1431 1 5 S Q13HQNVH AlligvdvO 13SQV3H 3AVH LVHL SWOO QI3HQNVH 01 531970 ITAVLINS HONOYHL Q3HIM 38 OSIY NVO S3OVdH3lNI S e e 310d 319NIS HILIMS NOLINA HSNd ANNOYI LINN NOILO3NNOO 39 ES SLVO14 Q3IHS 01 GALVNINYSL GTI3IHS Q3Q13IHS Q31SIML YOLONGNODS GQ3q13IHS Q3l1SIML 19074 0131 5 049 OL GALVNINYAL Q T3IHS MIVd Q3Q13IHS 315 Q3Q13IHS 4151 1 SNOILVNOISSG TOAWAS 77 NOLLVTIVISNI OL Q3QN3AWOO38 ATHOIH SI SHOVE 3dAL GILVIOSI 40 JSN SHOVE 9NILNDOA N3HM SYIHSYM NOILVINSNI 30 3Sn JHL 341038 AYN 754001 ONNOYI GIOAV OL SISSVHO 31 1051 12313 38 LSAW NOILVTIVISNI 1 NI GaSN 5 Olanv TV 31V1dX2V8 YOLOANNOD 4O MOVE S NI ONIGNNOYD N31N39 OL HOVLLV IVWNINYSL ONIX 318 115 V OL 013 ASIYA VND JHL LY GALVNINYSL LSNW SOTIIHS Q31VOIQNI ISIMYIHLO SSIINN 72 GILVINSNI NO1331 39 1 YO 38 CINOHS JAIM TV Page B 1 GMA 240 Installation Manual Figure B 1 GMA 240 Interconnect Drawin
13. ATIVOINIOdI3 34V SNId LAdLNO 13SQV3H 339N3SSVd ANY 1011402 74 NOILO3NNOO 321145 S 59 e e 310d FIONIS HILIMS NOLINA HSNd q SLVO14 13 5 YOLONGNOD 434013 5 GILSIML SLVO14 QlHS G3q13IHS GalSIML A1H9IH S 3dAL GILVIOSI 40 ASN 5 INILNNOW 04013 UO 03073 5 5 N3HA SH3HSVM NOILVINSNI 30 3SN 3H QNnONS9 Ol GILVNIWY3IL 9134 ANNOYI OL GQ3l1VNIN331 Q 3lHS 049 LINA IHS Q31SIM1 IHS G31ISIA1 NOILVN9IS3G 1O8MAS f IS OL Q3QN3AWOO3M 1 AYW SIHL 54001 GIOAV OL SISSVHO Q31VIOSI ATIVIIYLIITI 38 LSNW NOILVTIVISNI 3HL CASN 532 7 Oldnv TIY 31V1d39V8 MOLIO3NNOO 30 MOVE NI SINI 43139 OL HOVIIV ANY TVNIN331 ONIN 3TAVIINS V OL 5013 5 ASIYA XINO VW9 LY Q31VNIWN3l 38 ISNW 5013 5 T1V Q31V2IQNI 3SIMYSHLO 5531 0 Z d31V1nSNI NO1431 NO OMY 38 Q1nOHS 3NIM TIY L 310N AIN SOI m NI 3134099 9 NI ILIYOSIO A33 91 1011402 t 10922 0 2 4 ALON 335 gt A33 501 1014 L NI 313409 20772 orz VND SOI 03 3 912 02 TYNYILNI dl AINO 350 ONINIM AIN WOOS3INI ANOHd SSVd
14. MUSIC 1 IN RIGHT IN 25 MUSIC 1 IN LO 26 MUSIC 2 IN LEFT IN 27 MUSIC 2 IN RIGHT IN 28 MUSIC 2 INLO 29 FAILSAFE WARN AUDIO INHI IN 30 MUTE ON COM TX IN IN 31 PILOT HEADSET AUDIO OUT RIGHT OUT 32 COPILOT MIC AUDIO IN HI IN 33 COPILOT MIC KEY IN IN 34 COPILOT MIC AUDIO IN LO 35 PASS 1 MIC AUDIO IN HI IN Denotes Active Low Inputs ground to activate Outputs grounded when active 190 00917 01 GMA 240 Installation Manual Rev D Page 4 3 A GARMIN Table 4 2 J2402 Pin Assignments Pin Pin Name 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 4 2 3 P2403 Connector front panel 2 5 mm mini jack Figure 4 3 2 5 mm Plug Used with P2403 Table 4 3 P2403 Connector Pin Name MUSIC 1 LEFT IN TEL MIC OUT HI RING MUSIC 1 RIGHT IN TEL AUDIO IN HI SLEEVE MUSIC 1 LO INTEL AUDIO LO 4 3 Aircraft Power and Lighting 4 3 1 Aircraft Power The GMA 240 has four inputs for aircraft power bus inputs of 14 28Vdc Table 4 4 Aircraft Power Connector Pin Name AIRCRAFT POWER AIRCRAFT POWER POWER GROUND POWER GROUND GMA 240 Installation Manual 190 00917 01 Page 4 4 Rev D 4 3 2 Lighting Bus A GARMIN The GMA 240 can be configured to track a 14 or 28 Vdc lighting bus using these inputs
15. will be intercom isolated from the passengers PILOT ISO MUSIC IN Ground to allow Music audio to be heard by the pilot during pilot isolate mode BUTTON PRESS TONE ENABLE IN Ground to enable beep tone annunciation of button presses MUTE ON COM TX IN Ground to enable muting of other selected radios during mic selected COM transmission mic selected COM is still heard but not other selected radios Denotes Active Low Ground to activate 190 00917 01 Rev D GMA 240 Installation Manual Page 4 5 A GARMIN 4 5 Audio Inputs Outputs and Mic Keys 4 5 1 Mic Audio Inputs and Mic Keys Connector Table 4 7 Mic Audio Inputs and Mic Keys Pin Name PILOT MIC KEY IN COPILOT MIC KEY IN Description Enables respective MIC audio into the selected transceiver unit PILOT MIC AUDIO IN HI PILOT MIC IN LO Pilot Mic audio input and ground reference COPILOT MIC AUDIO IN HI COPILOT MIC IN LO Copilot Mic audio input and ground reference PASS 1 MIC AUDIO IN HI PASS 1 MIC AUDIO IN LO Passenger 1 Mic audio and ground reference PASS 2 MIC AUDIO IN HI PASS 2 MIC AUDIO IN LO Denotes Active Low Ground to activate 4 5 2 Intercom Key Inputs if configured Passenger 2 Mic audio and ground reference These inputs only perform the described ICS KEY function if the audio panel has been configured for KEYED ICS by configuration jumper s
16. 00917 01 Page 1 4 Rev D A GARMIN 2 INSTALLATION OVERVIEW 21 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 4 Equipment Available GMA 240 Audio Panel Ship Level Assembly P N 010 00735 includes the following depending on part number Table 2 1 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 2 2 2 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 2 3 GMA 240 Wiring Configuration and Adjustment Op
17. 07 9502 4 M81969 1 04 AMP 601966 1 601966 6 91067 1 Daniels AFM8 K42 M81969 1 04 Manufacturer NOTE Non Garmin part numbers shown are not maintained by Garmin and consequently are subject to change without notice 190 0091 7 01 GMA 240 Installation Manual Rev D Page 3 1 A GARMIN 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 J2401 ie caer 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 A 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 Table 4 1 Table 4 2 and Figure B 1 and Figure B 1 Install the rack assembly according to the dimensions given in Figure A 1 and Figure A 3 Mounting brackets are not supplied due to the wide range of mounting config
18. 240 Interconnect Drawing page 1 Of 3 B 1 Figure B 1 GMA 240 Interconnect Drawing page 2 Of 3 B 2 Figure B 1 GMA 240 Interconnect Drawing page 3 Of 3 B 3 Figure B 2 GMA 240 J2401 amp J2402 Connector Layout Drawing B 4 Appendix C Configuration Jumpers Drawinsg C 1 Figure 1 GMA 240 Internal ConfigurationJumper Layout Drawing C 1 GMA 240 Installation Manual 190 00917 01 Page vi Rev D TABLE Section 1 GENERAL DESCRIPTION Table 1 1 Physical Characteristics Table 1 2 Electrical Characteristics Table 1 3 Power Requirements Table 1 4 Reference Documents Section 2 INSTALLATION OVERVIEW Table 241 ette Section3 INSTALLATION PROCEDURE Table 3 1 Pin Contact Part Numbers Table 3 2 Recommended Crimp Tools Section 4 SYSTEM INTERCONNECTS Table 4 1 J2401 Pin Assignments Table 4 2 J2402 Pin Assignments Table 4 3 P2403 Connector Table 4 4 Aircraft Power Table 4 5 Lighting Table 4 6 External Configuration Pins Table 4 7 Mic Audio Inputs and Mic Keys Table 4 8 Intercom Key Inputs Table 4 9 COM Audion and Mic Keys Table 4 10 Alert Audio I O Table 4 11 AUX and NAV Audio Inputs Table 4 12 Failsafe Warning Audio Table 4 13 Music In
19. H BBA H B BB t B 1HR H t 2 BB page m Hr EjHBE u B m H gapan H T TI ngaa rt UU IL o oooo s TL M A Y e pu lt lt lt lt gg TT TI LE EB mm ul H 7 EH E DIU DII t HO Bottom of Main Board Front Right Corner PILOT KNOB Figure C 1 GMA 240 Internal ConfigurationJumper Layout Drawing 190 00917 01 Revision D GMA 240 Installation Manual Page C 1
20. IAGRAM AS A GUIDE FOR HOW THE PROVIDED CABLE SHOULD BE MODIFIED ALSO CONSIDER CHECKING WITH THE DEVICE MANUFACTURER OR ACCESSORY PROVIDER TO SEE IF A SUITABLE ADAPTOR CABLE IS COMMERCIALLY AVAILABLE IF PINS 5 6 amp 7 ARE NOT CONNECTED IN THE 14V OR 28V CONFIGURATION BACKLIGHTING WILL NOT FUNCTION NO BACKLIGHTING A GARMIN GMA 240 P2401 MASQ INHIBIT IN IG rk e eere She we 1 5 240 2402 SEE NOTE 5 PILOT ISO MUSIC IN 13 eee PILOT ISO MUSIC RETURN T BUTTON PRESS TONE ENABLE 19 Port MUTE ON COM TX IN 30 yusa qd ta 2 AUDIO PANEL CIRCUIT BREAKER AIRCRAFT POWER A 14 28 VDC AIRCRAFT POWER AIRCRAFT POWER 9 lt 6 AIRCRAFT GROUND 10 25 AIRCRAFT GROUND 11 lt 14V LIGHTING BUS LIGHTING BUS 14V HI 28V 7 B TO 14V LIGHTING BUS HI LIGHTING BUS 14V HI 28V LO 6 SEE NOTE 10 LIGHTING BUS 14V LO 28V LO 5 TO 14V LIGHTING BUS LO 28V LIGHTING BUS LIGHTING BUS 14V HI 28V HI 7 TO 28V LIGHTING BUS HI LIGHTING BUS 14V HI 28V LO 6 1 5 10 LIGHTING BUS 14V 10 28 LO 5 TO 28V LIGHTING BUS LO TO GMA 240 FRONT PANEL JACK J2403 SCHEMATIC OF PROVIDED ACCESSORY CABLE TO REMOTE DEVICE MUSIC IN LEFT TEL MIC OUT HI MUSIC IN RIGHT TEL IN HI MUSIC LO TEL LO PHONE MUS
21. IC PLAYER SEE NOTE 8 SEE NOTE 9 SEE NOTE 7 TIP MIC IN MUSIC LEFT RING EAR PIECE OUT MUSIC RIGHT SLEEVE AUDIO LO MUSIC LO 2 5mm Figure B 1 GMA 240 Interconnect Drawing page 3 of 3 190 00917 01 Revision D 240 Installation Manual Page B 3 APPENDIX B Interconnect Drawings GMA240 J2401 A GARMIN 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 2 2 AUDIO 2 AUDIO COM1MIC 1 COM 1 AUDIO 1 AUDIO AUX2 AUDIO AUX2 AUDIO RESERVED TEL AUDIO LO TEL AUDIO IN RESERVED RESERVED AUDIO OUT HI LO IN HI OUT AUDIO OUT HI LO IN HI IN LO IN HI AUDIO OUT HI HI 30 29 28 u 26 25 24 23 20 19 17 16 COM2 MIC CREWISO IN RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED AUX1 AUDIO AUX1 AUDIO NAV 2 AUDIO NAV 2 AUDIO NAV 1 AUDIO 1 AUDIO MASQ KEY OUT IN HI IN LO IN HI IN HI INHIBIT IN 44 43 42 41 40 39 38 37 36 35 34 33 32 31 ALERT 2 ALERT 2 3 PASS PASS PASS RESERVED RESERVED RESERVED RESERVED PILOT MIC PILOTMIC PILOT MIC ALERT 1 ALERT 1 AUDIO INHI AUDIOINLO HEADSET HEADSET HEADSET AUDIOINLO KEY IN AUDIO INHI AUDIO INLO AUDIO IN HI AUDIO OUT AUDIO OUT AUDIO OUT LO RIGHT LEFT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 ALERT 3 PILOTISO PILOTISO RESERVED AIRCRAFT AIRCRAFT AIRCRAFT
22. IN BE LIABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THE 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 with a new or newly overhauled replacement product the product 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 Online Auction Purchases Products purchased through online auctions are not eligible for warranty coverage 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 International Purchases A separate warranty may be provided by international distributors for devices purchased outside the United States depending on the country If applicable this warranty is provided by the local in country distributor and this distributor provides local service for your device Distributor warranties are only valid in the area of intended distribution Devices purchased in the United States or Canada must be returned to the Garmin service center in the United Kingdom the
23. MA 240 Connector Rack Assembly Drawing 190 00917 01 240 Installation Manual Revision D Page A 2 APPENDIX A Outline and Installation Drawings O PHON 1 STACK CUTOUT RACK INSTALLED FROM FRONI O PHON 2 RA FROM FRONT O PHON 3 RA 5 FROM BACK OF AIRCRAFT PA AXIMUM AIRCRAFT PANEL TH DIO CUTOUT RACK INSTAI OF AIRCRAFT PAN DIO CUTOUT RACK INSTALLED OF AIRCRAFT PAN ED EL EL EL ONLY 125 INCH 3 2 mm ICKN ESS 6 30 160 0 1 30 33 0 6 30 160 0 1 20 30 5 6 18 157 0 GARM A IN EHIND NOTES 1 DIMENSIONS INCH mm 2 IF THE FRONT LIP OF THE MOUNTING RACK 15 IHE SURFACE OF THE AIRCRAFT PANEL THE UNI CONNECTORS MAY NOT FULLY ENGAGE Figure A 3 GMA 240 Recommended Panel Cutout Dimensions 190 00917 01 Revision D 240 Installation Manual Page A 3 A GARMIN APPENDIX B Interconnect Drawings OISAW YO4 NMOHS SV 3ounos GIINNOW DISAW 304 NMOHS SV 1VNHN31X3 NV YSHLIG OL 38 AYW SI dNI HIOS 3NOHd3131 318 1 X04 MOVE ATAVLINS V OL YO NMOHS 5 3NOHd313l GALNNOW Q3XI4 V OL Q33IM 38 JOVAYNSINI 3NOHd313l AHL g NOILONYLSNI S YSAIZOSNVYL 3Hl 33S 7100 AIN DIN WOO
24. N MOUNTING JACKS USE OF ISOLATED TYPE JACKS IS HIGHLY RECOMMENDED TO SIMPLIFY INSTALLATION SYMBOL DESIGNATIONS WIRE SPLICE CONNECTION CIRCUIT BREAKER 77 AIRFRAME GROUND UNIT GROUND CONFIGURATION WIRING CONNECTION OPTIONALLY THEY MAY BE CONNECTED THROUGH A SWITCH TO GROUND IF TOGGLING IS DESIRED SEE INSTALLATION MANUAL TEXT FOR DETAILS IF A DEDICATED CIRCUIT BREAKER IS DESIRED 1 A RATING IS RECOMMENDED AIRCRAFT GROUND SHOULD BE CONNECTED DIRECTLY TO THE AIRFRAME USING MINIMAL WIRE LENGTH THE PROVIDED FRONT PANEL JACK AUDIO CABLES ARE COMPATIBLE WITH MANY PHONES AND PORTABLE AUDIO PLAYERS SOME DEVICES HAVE OTHER CONNECTOR STYLES IF THE PHONE HAS 2 5 MM JACK THE PROVIDED 2 5 MM CABLE IS THE MOST COMMON CONFIGURATION SOME PHONES WITH 2 5 MM JACKS USE CROSSOVER CABLES THAT SWAP THE MIC AND EARPIECE CONNECTION IF THIS CONVERSION IS NECESSARY OR IF A DIFFERENT STYLE CONNECTOR IS NEEDED TO INTERFACE TO THE PHONE USE THE ABOVE CONNECTION DIAGRAM AS A GUIDE FOR HOW THE PROVIDED CABLE SHOULD BE MODIFIED ALSO CONSIDER CHECKING WITH THE PHONE MANUFACTURER OR ACCESSORY PROVIDER TO SEE IF A SUITABLE ADAPTOR CABLE IS COMMERCIALLY AVAILABLE FOR AUDIO PLAYERS THE PROVIDED CABLES ARE STANDARD FOR DEVICES THAT USE STEREO AUDIO JACKS SOME DEVICES USE SPECIAL CONNECTOR STYLES IF A DIFFERENT STYLE CONNECTOR IS NEEDED TO INTERFACE TO THE AUDIO PLAYER USE THE ABOVE CONNECTION D
25. O IN HI AUX1 AUDIO IN LO RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED CREW ISO IN COM 2 MIC KEY OUT ALERT 1 AUDIO IN HI ALERT 1 AUDIO IN LO PILOT MIC AUDIO IN HI PILOT MIC KEY IN PILOT MIC AUDIO IN LO RESERVED RESERVED RESERVED RESERVED PASS HEADSET AUDIO OUT LEFT 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 GMA 240 Installation Manual 190 00917 01 Page 4 2 Rev D A GARMIN 4 2 2 42402 Connector Table 4 2 J2402 Pin Assignments Pin Pin Name PILOT HEADSET AUDIO OUT LO COPILOT HEADSET AUDIO OUT LO COPILOT HEADSET AUDIO OUT LEFT COPILOT HEADSET AUDIO OUT RIGHT LIGHTING BUS 14V LO 28V LO LIGHTING BUS 14V HI 28V LO LIGHTING BUS 14V HI 28V HI IN AIRCRAFT POWER IN 9 AIRCRAFT POWER IN 10 AIRCRAFT GROUND 11 AIRCRAFT GROUND 12 RESERVED O 0 N gt 13 PILOT ISO MUSIC IN IN 14 PILOT ISO MUSIC RETURN 15 ALERT 3 AUDIO IN HI IN 16 PILOT HEADSET AUDIO OUT LEFT OUT 17 RESERVED x 18 RESERVED m 19 BUTTON PRESS TONE ENABLE IN IN 20 COM SWAP IN IN 21 COM SWAP IN RETURN _ 22 RESERVED 23 MUSIC 1 IN LEFT IN 24
26. Table of Contents i vi Section 1 1 1 1 4 Section 2 2 1 2 6 Section 3 3 1 3 4 Section 4 4 1 4 10 Appendix A A 1 A 3 Appendix B 1 4 Appendix C 1 GMA 240 Installation Manual Page i A GARMIN 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 SERVICE SERVICE PURPOSE OF MODIFICATION BULLETIN BULLETIN NUMBER DATE GMA 240 Installation Manual 190 00917 01 Rev D Page ii A GARMIN 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 Author
27. 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 The brightness of the LED annunciators that illuminate each key when selected is controlled by a photocell that operates independently of the backlight input Table 4 5 Lighting Bus Pin Connector Pin Name 5 2402 LIGHTING BUS 14V LO 28V LO 6 P2402 LIGHTING BUS 14V HI 28V LO IN 7 P2402 LIGHTING BUS 14V HI 28V HI IN 4 4 Configuration Pins 4 4 1 External Configuration Pins The following pins may be used to change the configuration of the installation as described Connector Table 4 6 External Configuration Pins Pin Name MASQ INHIBIT 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 CREW ISO IN 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
28. United States Canada or Taiwan for service Garmin International Inc Garmin Europe Ltd 1200 East 151st Street Liberty House Bulls Copse Road Olathe Kansas 66062 U S A Hounsdown Business Park Phone 913 397 8200 Romsey SO40 9RB U K FAX 913 397 0836 Phone 44 0 870 8501241 FAX 44 0 870 850125 190 0091 7 01 GMA 240 Installation Manual Rev D Page iii A GARMIN This page intentionally left blank GMA 240 Installation Manual 190 00917 01 Page iv Rev D A GARMIN TABLE OF CONTENTS PARAGRAPH PAGE Section 1 GENERAL DESCRIPTION 1 1 1 1 u u n omi aae 1 1 1 2 Eguimment DEI ON aY AA vids 1 1 1 3 Technical SPECINCAUONS 1 2 Reference Documents NBA ebd ven Don sane ha dna 1 4 Section 2 INSTALLATION OVERVIENW 2 1 Sonidos 2 1 2 2 Installation Materials En pur Hu ue ER AA 2 1 2 3 GMA 240 Wiring Configuration and Adjustment Options 2 1 ene 2 5 24 5 MA 240 Ue ox CHF EINE PE LER UM 2 6 Section 3 INSTALLATION PROCEDURE 3 1
29. c input impedance 600 Q differential Music gain 20dB min volume 26dB max volume typ Music input level lt 200 mVrms for full power output max music volume knob position typ 3 5 Vrms max music input level Music Functions Music bandwidth 20 Hz to 20 kHz full power output Music distortion lt 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 three 150 headsets in parallel each driven to 100 mW Input Impedance 5 1 Front Panel Mini Music Input Auto detection of music source will use jack as Music 1 Jack Functions Telephone Input Auto detection of TEL source will use jack for TEL Telephone ring signal is heard without TEL selected 13 3 Power Requirements Table 1 3 Power Requirements Characteristic Specification Input Voltage Range 11 to 33 Vdc 4 3 W normal operation 310mA 13 8 V 7 5 W max operation 540 mA 13 8 V Power Input 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 Table 1 4 Reference Documents 190 00917 00 GMA 240 Pilot s Guide 190 00917 02 GMA 240 Maintenance Manual GMA 240 Installation Manual 190
30. ceiver inputs 3 including TEL Dedicated Receiver inputs 4 all independently selectable Alert unswitched inputs 3 each with configurable volume Input impedance 500 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 compatible with 150 to 600 O mics Microphone bias voltage about 10 Vdc delivered through 450 Q 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 190 0091 7 01 Rev D Output amplifiers 2 stereo pilot copilot passengers Fidelity Load Power Distortion typ 1500 50 mW lt 0 03 THD N 1500 100 mW lt 0 07 THD N 500 150 mW lt 0 07 THD N 500 300 mW lt 0 10 THD N Compatible with higher headphone impedances those shown are for worst case distortion and bandwidth GMA 240 Installation Manual Page 1 3 A GARMIN Table 1 2 Electrical Characteristics Characteristic Specification Music inputs stereo 2 Musi
31. dio is receiving audio If a jumper is supplied in this position the intercom system Enable ICS will only allow intercom MIC audio to be heard when KEYED the corresponding ICS KEY for the MIC position is Ics 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 Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved 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 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 2 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 190 0091 7 01 GMA 240 Installation Manual Rev D Page 2 3 220 L p IN I 1 O ALRT 1 ALRT 2
32. 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 190 0091 7 01 GMA 240 Installation Manual Rev D Page 2 5 A GARMIN 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 Figure 2 3 GMA 340 Unit Rack 115 00262 00 GMA 240 Installation Manual 190 00917 01 Rev D Page 2 6 A GARMIN 3 INSTALLATION PROCEDURE 3 1 Unpacki
33. ettings 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 Connector Table 4 8 Intercom Key Inputs Pin Name PILOT ICS KEY IN COPILOT ICS KEY IN PASSENGER ICS KEY IN Denotes Active Low Ground to activate GMA 240 Installation Manual Page 4 6 Description Enables respective mic audio to be heard in the intercom 190 00917 01 Rev D A GARMIN 453 COM Audio and Mic Keys Table 4 9 COM Audion and Mic Keys Pin Connector Pin Name Description COM 1 MIC KEY OUT Enables transmission on the COM 2 MIC KEY OUT respective transceiver unit COM 1 AUDIO IN HI COM 1 Audio Input COM 1 MIC AUDIO OUT HI COM 1 Audio Output COM 1 AUDIO LO Ground Reference for COM 1 COM 2 AUDIO IN HI COM 2 Audio Input COM 2 MIC AUDIO OUT HI COM 2 Audio Output COM 2 AUDIO LO Ground Reference for COM 2 Denotes Active Low Sinks current to ground when active 4 5 4 Alert Audio I O Table 4 10 Alert Audio I O Connector Pin Name Description ALERT 1 AUDIO IN HI Alert 1 Audio Input ALERT 1 AUDIO IN LO Ground Reference for Alert 1 ALERT 2 AUDIO IN HI Alert 2 Audio Input ALERT 3 AUDIO IN HI Alert 3 Audio Input ALERT 2 3 AUDIO INLO Ground Reference for Alert 2 amp 3 4 5 5 AUX and NAV Audio Inputs Table 4 11 AUX and NAV Audio Input
34. g page 1 of 3 5310 336 n 87 01 NI Z JISNW 32410 gt 12 Z 2 310 33S 97 1331 Z NA O1 NI 1 L 310 335 e gt sour vz NI L o U E ez 1431 NI L JISNW LZ NANLIY dVMS WOO aN NOD e H L OZ NI dVMS WOO a L 324005 ONINYYM 349 1IV3 d gt 6z IH NI NYVM 114 Q ON 3OMhOS 1431Y d IH NI l331V VW9 33 DN 3 m gt H NI Z 14319 IH NI Z LYITY CN L ON 328005 LYITY gt z NI 1 1831Y H 1 IH NI 1997 gt 8 01 NI zxnv s y ON 394005 XN H gt L IH NI olany zxnv Tm gt zz NI gt LZ IH NI LXNY C 7 ON N3AI303M AVN 05 z AYN 7 gt 61 IH NI Z AVN N m ON 43 3934 AVN a DUAL SUBDIT KA U 11 IH NI AVN a S INO OIN 131 30VJN31NI 3NOHd3131 131 9 3LON 33S IH NI 131 08 INO
35. htness of the backlighting is controlled by the aircraft lighting bus A fail safe circuit connects the pilot s headset and microphone directly to and a fail safe 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 de emphasis 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 GARMIN 240 MUSIC RAON NAV1 2 AUXI AUX2 n a 4 PILOT MUSIC n P 18 RADIO MUSC Figure 1 1 GMA 240 Unit View 190 0091 7 01 GMA 240 Installation Manual Rev D Page 1 1 A GARMIN 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 pas
36. is configured Normally the isolated ICS positions do not hear music BUTTON PRESS TONE ENABLE This input enables an audible tone to be heard when a button press is GMA 240 Installation Manual 190 00917 01 Page 2 4 Rev D A GARMIN 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
37. ized Service Center and 90 days for factory repaired or newly overhauled products exchanged at Garmin in lieu of repair Within the applicable 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 apply to 1 cosmetic damage such as scratches nicks and dents ii consumable parts such as batteries unless product damage has occurred due to a defect in materials or workmanship iii damage caused by accident abuse misuse water flood fire or other acts of nature or external causes iv damage caused by service performed by anyone who is not an authorized service provider of Garmin or v damage to a product that has been modified or altered without the written permission of Garmin In addition Garmin reserves the right to refuse warranty claims against products or services that are obtained and or used in contravention of the laws of any country THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES WHETHER EXPRESS 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 GARM
38. jumper is supplied in these positions internal sidetone Sidetone will be heard during PTT to simulate received sidetone from a radio that does not provide one during COM2 transmission This should only be used if a radio does not Internal Empty perform this function already Sidetone If this jumper is removed intercom audio and intercom sidetone will not be heard when the TEL button is TEL selected Many phones supply sidetone when a call is in Internal Populated session This causes a noticeable change in intercom Sidetone 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 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 TEL jack detect bypass GMA 240 Installation Manual 190 00917 01 Page 2 2 Rev D A Y GARMIN Table 2 1 Configuration Jumpers Component Name Default Description Only If a jumper is supplied in this position the RADIO button Primary will mute music only when the Primary COM the COM COM selected for transmission is receiving audio Default mutes RADIO mutes music operation occurs when any selected MUSIC COM NAV AUX ra
39. ng 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 336 00021 00 Military P N M39029 58 360 AMP 204370 2 Positronic MC8522D ITT Cannon 030 2042 000 Table 3 2 Recommended Crimp Tools Hand High Density 22 28 AWG Crimping Tool Positioner Insertion Extraction Tool Military P N M22520 2 01 M22520 2 09 81969 1 04 Positronic 95
40. puts Table 4 14 Tel Audio I O Table 4 15 Headset Outputs Table 4 16 COM Swap 190 0091 7 01 Rev D LIST OF TABLES A GARMIN GMA 240 Installation Manual Page vii A GARMIN This page intentionally left blank GMA 240 Installation Manual 190 00917 01 Page viii Rev D A GARMIN 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 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 The brig
41. re 1 1 GMA 240 Unit 1 1 Section 2 INSTALLATION OVERVIEW 2 1 Figure 2 1 ESD Caution AG 2 2 Figure 2 2 Access Hole Locations Top 2 4 Figure 2 3 GMA 340 Unit Rack 115 00262 00 aa 2 6 Section INSTALLATION PROCEDURE 3 1 Figure 3 1 Audio Shield Termination 3 2 Section 4 SYSTEM INTERCONNECTS 4 1 Figure 4 1 Rear View of Backplate and Rack ui aaa 4 1 Figure 4 2 Rear Connectors J2401 amp J2402 Viewed from Back of Unit 4 1 Figure 4 3 2 5 mm Plug Used 4 4 Figure 4 4 Audio Jack 6 ANAKAN ANNA AASA 4 10 Appendix A Outline and Installation Drawinss A 1 Figure A 1 GMA 240 Outline Drawing n n asas 1 Figure 2 GMA 240 Connector Rack Assembly Drawing A 2 Figure A 3 GMA 240 Recommended Panel Cutout A 3 Appendix Interconnect Drawinsgs B 1 Figure B 1 GMA
42. s Connector Pin Name Description AUX1 AUDIO IN HI AUX1 Audio Input AUX1 AUDIO IN LO Ground Reference for AUX1 Input AUX2 AUDIO IN HI AUX2 Audio Input AUX2 AUDIO IN LO Ground Reference for AUX2 Input NAV 1 AUDIO IN HI NAV 1 Audio Input NAV 1 AUDIO IN LO NAV 1 Ground Reference NAV 2 AUDIO IN HI NAV 2 Audio Input NAV 2 AUDIO IN LO NAV 2 Ground Reference 190 0091 7 01 GMA 240 Installation Manual Rev D Page 4 7 A GARMIN 4 5 6 Failsafe Warning Audio Table 4 12 Failsafe Warning Audio 2402 FAILSAFE WARN AUDIO IN HI Failsafe Warning Audio Input 4 5 7 Music Inputs Table 4 13 Music Inputs Connector Pin Name Description MUSIC 1 IN LEFT Music 1 Input MUSIC 1 IN RIGHT MUSIC 1 IN LO Ground Reference for Music 1 MUSIC 2 IN LEFT Music 2 Input MUSIC 2 IN RIGHT MUSIC 2 IN LO Ground Reference for Music 2 Table 4 14 Tel Audio I O Connector Pin Name Description TEL AUDIO IN HI Telephone Audio Input TEL AUDIO LO Ground Reference for Telephone TEL MIC AUDIO OUTHI TEL MIC Audio Output 190 00917 01 GMA 240 Installation Manual Rev D Page 4 8 A GARMIN 4 5 9 Headset Outputs Table 4 15 Headset Outputs Pin Connector Pin Name Description 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
43. s on 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 GMA 240 Installation Manual 190 00917 01 Page 3 4 Rev D A GARMIN 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
44. se right channel audio when another passenger plugs in a mono headset Set the intercom to the ALL mode Pilot ISO LED off 2 Plugin headsets at each ICS position a 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 190 0091 7 01 GMA 240 Installation Manual Rev D Page 3 3 A GARMIN 3 5 5 1 3 5 6 Aircraft Receivers Check Select the audio source corresponding to each installed avionics unit and check for audio over the headsets Music System Check Set the intercom to the ALL mode Pilot ISO LED off 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 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 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 i
45. senger 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 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 Table 1 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 GMA 240 Installation Manual 190 00917 01 Page 1 2 Rev D A GARMIN 1 3 2 Electrical Characteristics Characteristic Temperature Range Table 1 2 Electrical Characteristics Specification 20 C to 55 C operation 55 C to 85 C storage Altitude 55 000 Feet Audio Panel Functions Dedicated Trans
46. stallation Manual 190 00917 01 Page 4 10 Rev D A GARMIN APPENDIX A Outline and Installation Drawings 1 9 S 2401 6 30 160 0 e 2 91 J2402 73 8 fi Ot 2 5 210 s 78 7 6 22 157 9 7 12 180 7 20 200 5 08 100 CSK INSIDE RACK 3 4 PLACES PER SIDE 110 2 0 60 4x 0 025 15 2 0 64 1 28 0 93 e V 23 7 s 0 54 1 Mi uo AG 13 7 a 16 5 5 16 131 1 Figure A 1 GMA 240 Outline Drawing 190 00917 01 240 Installation Manual Revision D Page A 1 A GARMIN APPENDIX A Outline and Installation Drawings 011 00405 00 CONNECTOR RACK KIT ITEM PART NUMBER DESCRIPTION QTY 115 00262 00 INSTALL RACK 125 00040 00 CONNECTOR PLATE 3 211 60234 08 SCREW 4 40x 250 PHP SS P 6 6 330 00220 25 8 210 00036 07 HEX 46 32 5 1 19 115 00261 00 CAPTIVE NUT COVER Tt NOT SHOWN 336 00021 00 CONT PIN MIL CRIMP SIZE 22D 100 J2402 Figure A 2 G
47. tions 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 Section 2 3 1 and Section 4 4 1 Internal configuration jumpers Section 2 3 1 Volume Mute adjustments Section 2 3 2 190 0091 7 01 GMA 240 Installation Manual Rev D Page 2 1 A GARMIN 231 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 0Q 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 CAUTION ELECTROSTATIC SENSITIVE DEVICES Figure 2 1 ESD Caution Logo NOTE The GMA 240 contains static sensitive components Observe proper anti static procedures when performing any solder procedures on the unit Table 2 1 Configuration Jumpers Component Default Description Alert Mutes If this jumper is removed music will not be interrupted by Populated SA Music alert audio Default operation is recommended COM1 Internal Empty If a
48. urations 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 3 32 Allen wrench into the jackscrew access hole on the faceplate Turn the Allen wrench clockwise until the unit 1s secured in the rack Continue turning until tight but do not over tighten N 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 GMA 240 Installation Manual 190 00917 01 Page 3 2 Rev D A GARMIN 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 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
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