Garmin GMA 240 Stereo Receiver User Manual
Contents
1. GSLNNOW Q3Xl4 V OL Q3MIM 38 32 48 INOHd31I1 JHL 9 IWANVW NOILONYLSNI 5 43 1325 1 FHL 33S 7110 xA3 DIN WOO S VW9 OL SIO3NNOO AIM lid S QI3HQNVH FHL SNId 01 WOO IH LINO OIGNV DIN WOO S VN9 01 SIO3NNOO LNdNI SIN 5 SNId 07 Olanv WOO NI Oldnv WOO S VW9 3Hl Ol 5123 02 O3N3IS 4 AINO T3NNVHO 1431 LAdLNO 1350 3 S Q13HQNVH JHL 5 3AVH LVHL SWOOD QI3HQNVH 01 5318 2 SHOVE FIEVLINS HONOYHL GIYIM 38 OSIY NVO S3OVdHilNI YFAIZOSNVAL 76 Q3QN3AWO233M AIHOIH SI SIHL 754001 OL SISSVHO WO3N4 31 1051 V OL 5013 5 ASIVG YOLONGNOD Q3Q 3IHS G3ALSIML 1 1442 8 YOLOANNOD 40 MOVE NI LINN SLVO14 Q IHS SIWO14 Q IHS MIVd Q3Q73IHS GALSIML ALIMNIGVdVD e e 310d FIONIS HOLIMS NOLINE HSNd NOILO3NNOO 391145 3MIM d GNNOYD OL Q31VNIWH31 13 5 YOLONGNOD 03013 Q3l1SIML OL Q31VNIW3S31 Q 3lHS MIVd Q3Q73IHS QILSIMI SNOILVN9IS3Q 108MAS 7 NOLLVTIVISNI A3lIdWIS OL CALVINSNI NO1331 39 1 YO OMV CILVIOSI 40 ASA SAYF ONILNNOW N3HM SYIHSVM NOILVINSNI 30 3SN 3Hl 3UINDIY AYN ATIVORILO3T1I 38 ISO NOILVTIVISNI NI 0350 5 Oldnv TIY 59071 331N30 OL HOVIIV ANY IVNINYIL ONIN FTEVLINS2. OL SISSVHO Q3l1VIOSI ATIVOl4IO313 38 LSAW NOILVTIVLSNI 10 MOVE NI ASIVG SATALS YOLOANNOD YIHLO 3AVH 5391 3 INOS SH3AVId OIONV 3719 S3NOHd ANVA d18l1VdWOO S318VO OIONW TANVd LNOY4 JHL 4 HLONAT 38IM ONISN INVHAUlv FHL OL ATLOAYIG Q3193NNOO 38 Q34IS3Q SI SNIIVH V NOILONN4 93713971 FHL 1341530 SI N3xv3sN8 LINDAI CILVIICIO V di 79 STIVL3GO S9NII9901 di GNNOYD OL HOLIMS V HONOYHL CILIINNOI OL CIONNOYI 38V SNid NOILVYNSIANOD 76 NOILOANNOD ONIYIM NOILVHODIJNOO LINN aaavaaa noaio 7 3WvaidMv 4 NOILO3NNOO 39145 L SNOILVN9IS3Q 108MAS v NOILVTIVLSNI 5 OL Q3QN3AWOO33 ATHOIH SI SHOVE CILVIOSI 40 dal VINSNI 54001 NI 35 5 Olanv TIY 31V1d39V8 YOLIINNOI S NI ONIOUNNOY9 YILNII OL HOVILIV ANY TVNINYI3L ONIN IT18VLINS OL SQI3IHS 0 2 VW9 JHL LV GILVNINYIL 38 5 5013 5 11 Q31VOIQNI 3SIMH3HIO SSITNN Z 3398NVl HO 38 CINOHS JAIM TIV SALON 131 01 SISNW 2 01 SISNW 01 IANS 1H9lM OISNN 1 0 32314 1431 ISN NI DIN 4 335 6 310N 335 8 310N 33S YIAVId OISQN ANOHd 3911340 S
3. i B 3 B 1 GMA 240 Interconnect Drawing page 3 Of 3 eren nre B 5 B 2 GMA 240 J2401 amp J2402 Connector Layout Drawing i B 7 C 1 GMA 240 Internal Configuration Jumper Layout Drawing C 1 LIST OF TABLES TABLE PAGE 3 1 R commended Crimp Tools 1 2 ue petet deere 3 1 431 J240l Pin eee datei od dede det tee N a 4 2 4 2 72402 Pin Assienments opositor redd aan eis 4 3 GMA 240 Installation Manual Page v 190 00917 01 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 SERVICE SERVICE PURPOSE OF MODIFICATION BULLETIN BULLETIN NUMBER Page vi GMA 240 Installation Manual Revision A 190 00917 01 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 version
4. 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 O I I ga 2402 5 4 amp 1 O Figure 4 1 Rear View of Backplate and Rack T D 7 J2401 04 S 4 2 Pin List 19 9ooooooo0000o0o o 500 030 01070 0 0 0 0 O 0 O Oo 5 4499 50 Figure 4 2 Rear Connectors 2401 amp 2402 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 amp 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 Page 4 1 190 00917 01 Rev A 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
5. AINO QN3 0 2 VND FHL IV GILVNINYIL 38 LSAW 5013 5 TIV G3LVOIGNI ISIMYIHIO 5531 0 Z 38 GINOHS JAIM TIV 15310 O1 NI OISNW 1H9IM 5 1431 NI 2 OISNW O1 NI L OISNW NI L 5 1331 NI I OISNW NUNLIY NI dVvMS WOO NI dVMS WOO IH 34VS IH LNTIV Ove NI e z lN3lV H NI OlOnVv 14317 O1 NI OlGNV 1931 NI OlGNV 14317 O1 NI zxnv H NI zxnv O1 NI CIONV ixnv H NI CIONV ixnv O1 NI AVN H Z AVN O1 NI OIONV AVN H NI OIONV AVN H INO OIGNV OIN 131 oianv 131 H NI 131 100 xA3 OIN Z WOO LNO OIGNV WOO 01 oldnv WOO H NI Olanv WOO 1 OIN WOO H 1nO OIN NOI 01 WOO H NI WOO Otz VW9 Figure B 1 GMA 240 Interconnect Drawing page 1 of 3 Page B 1 Page B 2 blank GMA 240 Installation Manual 190 00917 01 Rev A APPENDIX B INTERCONNECT DRAWINGS NOILISOd LVHL 304 AINO M332 114 YSAIZOSNVYL S31VAILOV IN3130 5 FHL SOI FHL SALVAILOV
6. 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 Ifinstalled check that the failsafe warning is heard in the pilot headphone s left earpiece Turn the unit back on to continue testing 3 5 8 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 Stereo headsets are recommended if stereo jacks 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
7. eene e eem ae nete ale Gen 4 1 ERU RM 4 1 4 3 Aircraft Power 4 4 AA Configuration Pins e e Pt aeo utere n tet are 4 5 4 5 Audio Inputs Outputs and Mic Keys 4 6 GMA 240 Installation Manual Page iii 190 00917 01 Revision A PARAGRAPH PAGE APPENDIX A OUTLINE AND INSTALLATION DRAWINGS ii A 1 APPENDIX B INTERCONNECT DRAWINGS u ii B 1 APPENDIX CONFIGURATION JUMPER C 1 Page iv 240 Installation Manual Revision A 190 00917 01 LIST OF ILLUSTRATIONS FIGURE PAGE 1 1 GMA 240 Umt View te ett e ede Ree e ee edd ee Hs 1 1 2 1 GMA 240 Unit Rack 115 00262 00 2 4 3 1 Audio Shield Termination Rail iced 3 2 3 2 Access Hol Location Top View alc ola ani aiar 3 5 4 1 Backshell Rear Connector Plat uri tite a e Fi ee ue bt o Eee tea E Re HER reete 4 1 4 2 Rear Connectors J2401 amp J2402 Viewed from Back of 4 1 A l GMA240 Qutlne Drawings iride nie p e eie ae ara A 1 2 GMA 240 Connector Rack Assembly Drawing i A 3 A 3 GMA 240 Recommended Panel Cutout Dimensions esee A 5 B 1 GMA 240 Interconnect Drawing page 1 Of 3 B 1 B 1 GMA 240 Interconnect Drawing page 2 Of 3
8. TEL AUDIO LO TEL AUDIO IN RESERVED RESERVED AUDIO OUT HI LO IN HI KEY OUT AUDIO OUT HI LO IN HI IN LO IN HI AUDIO OUT HI HI 30 29 28 27 26 25 24 23 21 20 19 18 17 16 COM 2 CREW ISO IN RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED AUX1 AUDIO AUX1 AUDIO NAV 2 AUDIO NAV 2 AUDIO NAV 1 AUDIO NAV 1 AUDIO MASQ KEY OUT IN HI INLO IN HI INLO 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 PILOT MIC PILOT MIC ALERT 1 ALERT 1 AUDIO INHI AUDIO IN LO HEADSET HEADSET HEADSET AUDIO IN LO KEY IN AUDIO INHI AUDIO IN LO AUDIO IN HI AUDIO OUT AUDIO OUT AUDIO OUT LO RIGHT LEFT 15 14 13 12 11 10 9 8 6 5 4 3 2 1 ALERT 3 PILOT ISO PILOT ISO RESERVED AIRCRAFT AIRCRAFT AIRCRAFT 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 28V LO LO 28V LO AUDIO OUT AUDIO OUT AUDIO OUT AUDIO OUT RIGHT LEFT LO LO 30 29 28 27 26 25 24 23 22 21 20 19 18 16 MUTE ON FAILSAFE MUSIC2INLO MUSIC 2 IN MUSIC 2IN MUSIC 1 IN LO MUSIC 1 IN MUSIC 1IN RESERVED COM SWAP COM SWAP BUTTON RESERVED RESERVED PILOT COM TX AUDIO RIGHT LEFT RIGHT 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 RESER
9. Telephone 503 581 8101 RECORD OF REVISIONS Revision Revision Date Description 06 09 08 Initial Release Page A GMA 240 Installation Manual Rev A 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 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 Page Range Table of Contents Section 1 Section 2 Section 3 Section 4 Appendix A Appendix B Appendix C GMA 240 Installation Manual Page 190 00917 01 Revision A This page intentionally left blank Page ii GMA 240 Installation Manual Revision A 190 00917 01 TABLE OF CONTENTS PARAGRAPH PAGE UL GENERAL DESCRIPT
10. 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 Output amplifiers 2 stereo pilot copilot passengers Fidelity Load Power Distortion typ 150 0 50 mW lt 0 03 THD N 150 Q 100 mW lt 0 07 THD N 50 0 150 mW lt 0 07 THD N 50 0 300 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 3 190 00917 01 Rev A Characteristic Specification Music Functions Music inputs stereo 2 Music input impedance 600 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 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 Q three 150 O headsets in parallel each driven to 100 mW Front Panel Mini Input Impedance 5 1 kQ sacie Functions Music Input Auto detection of music source wi
11. 0001 739 Daniels AFM8 K42 M81969 1 04 Astro 615717 615725 M81969 1 04 1 Non Garmin part numbers shown are not maintained by Garmin and consequently are subject to change without notice AMP 601966 1 601966 6 91067 1 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 Page 3 1 190 00917 01 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 712402 s 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 Avoid installing the unit near heat sources If this is not possible ensure that additional cooling is provided Allow adequa
12. 1 Audio Input COM 1 MIC AUDIO OUT 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 Page 4 6 GMA 240 Installation Manual Rev 190 00917 01 4 5 4 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 IN LO Ground Reference for Alert 2 amp 3 4 5 5 AUX and NAV Audio Inputs 21 AUX1 AUDIO IN HI AUX1 Audio Input IN 22 AUX1 AUDIO IN LO Ground Reference for AUX1 Input 7 AUX2 AUDIO IN HI AUX2 Audio Input 8 AUX2 AUDIO IN LO Ground Reference for AUX2 Input 17 NAV 1 AUDIO IN HI NAV 1 Audio Input 18 NAV 1 AUDIO IN LO NAV 1 Ground Reference 19 NAV 2 AUDIO IN HI NAV 2 Audio Input 20 NAV 2 AUDIO IN LO NAV 2 Ground Reference 4 5 6 Failsafe Warning Audio Pin Connector Pin Name Description P2402 FAILSAFE WARN AUDIO IN HI Failsafe Warning Audio Input 2 5 4 5 7 Music Inputs Connector Pin Name Description MUSIC 1 IN LEFT MUSIC 1 IN RIGHT MUSIC 1 IN LO Ground Reference for Music 1 MUSIC 2 IN LEFT MUSIC 2 IN RIGHT MUSIC 2
13. AHL 3NInO3H AVA SIHL Sd001 GIOAV OL SISSVHO WON4 GALVIOS ATIVOIMIO313 38 LSNW NOILVIIVISNI 5 S Y Olanv TIY 76 31V1dMOV8 MOIO3NNOO 40 MOVE NI S NI ONIGNNOYD 1 5 Ol HOVIIV ANY TVNINY3L ONIN IT78VLINS V OL SQI3IHS ASIYA QN3 OFZ FHL 1Y GILVNINYIL 38 LSAW 5013 5 TY GILVOIONI 5531 0 Z Q31VINSNI NOTHIL 9 1 YO 38 GINOHS JAIM NY I 5310 a ADI 521 H39N3SSVd 2 Le NI e gt 99 2 NI 3LIMOSIO A33 SOI 1011402 70773 orz soria LI L NI 31359510 Zorzal orz SOI YO4 GIYNOIANOD YIdNNF 31 AINO 350 AIA WOOM3INI T ez NI 051 M332 2 310 335 8 d zy 01 100 1350 3 55 4 xovr 3NOHd SSYd iy IHOIY LNO 1350 55 4 d ov 1431 1 0 1350 3 55 4 S 3LON 335 loved 0 2 Z 335 n 2 LNO 1350 3 1011409 XOVr 3NOHd SSVd v LNO 1350 3 1011402 e lt 1431 100 1350 3 1011402 Es e_N lt MIY 3NOHd 1011402 i e E L 01 1 0 1350 10
14. FRONT i ALRT 3 o o TEL VOL VOL REAR TEL VOL O MUTE AV O qu Figure 2 1 Access Hole Location 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 isolat
15. GARMIN GMA 240 MUSIC COM1 NAV1 NAV2 AUX1 AUX2 RADIO TL O mul m lt ICS sa 7 22 COM2 PILOT ute music MIC fp VOL PU 41 2 1 Usi COPILOT Figure 1 1 GMA 240 Unit View GMA 240 Installation Manual Page 1 1 190 00917 01 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 Tech
16. 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 Page 3 3 190 00917 01 Rev A 2 Plug in headsets at each ICS position 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 ad
17. 1 3130 15413 AHL HOIHM NI SAJA 39VIS OMI J18ILVdNOD OSIY SLNdNI AIM 521 4 1NdINO 01 1350 3 3 3315 034315 e INdINO l3SQV3H dir INdINO 1431 13SQV3H 38 OL IN3YYNI AlddNS YIMOd 5512 3 5350 2 SIHL 1 5 1350 3 ONOW A8 OL CILYOHS SI INdINO 13NNVHO LHOIY S 13NVd OlQanv JHL YOY 038315 V NI Q3Sn SI 13SOV3H TVHNVNOW V 3 0138 NMOHS SV 3004 ONOW NI N3HM 12 1 02 ONIX SAYF JHL WO4 LAdLNO TANNVHO 5 13 4 Oldnv SLOANNOOSIG LVHL HOLIMS O3N31S ONON V SAXOV O333lS AOTdNI GINOHS NOILVTIVISNI 3Hl AT3AILVNH3LTV Q3TIVISNI JUV SHOVE O3N31S di Q30N3AWOO3N SI3SQV3H 0398315 79 ALINIGILVdNOD OVE VND 3ON3INJANOO 304 GaMddAS SNId 3ivuvd3S Orc VND 3Hl 3015 NOILO3NNOO 3AVS 3Hl ATIVOINLOATA SNId LNdLNO 13SQV3H H39N3SSVd 1011402 S NOILO3NNOO 3OlldS 4 e e 310d 319NIS HOLIMS HSNd S1VO14 13 5 YOLINONOI 03013IHS CILSIMI SLVO14 13 5 MIVd 03013IHS 3151 1 aANNOX9 OL Q31VNIW331 Q I3lHS YOLONGNOD QO3Q 3IHS QILSIMI ONNOZ9 01 GILVNINYIL 13 5 03013 5 CILSIMI SNOILVNOISSG 1O8MAS 77 NOILVTIVISNI AJlIdWIS OL 0CIONINNODIY SI SAXOV 03171051 40 ISN SHOVE 9NILNDON N3HM SH3HSYM NOILVINSNI 30 JSN
18. 119 xovr 10118 n 100 L3SGV3H 10114 H 91 1431 100 13SQV3H 10119 cored 0 2 NOILVANDIANOD NOILVIOSI M3YO Y04 L3SQV3H d3193NNO2 LON gt 6 NI OSI M32 310N 33S A XOY 3NOHd SSYd eH 8 17 zy 01 LNO 1350 3 SSYd Sea pedea Lia 1H9lM 1nO 1350 3 55 4 07 1431 LNO 1350 3 55 4 S 310N 335 loved 072 310N 5 2 01 1 0 13SQV3H 1071402 v 1H9IN LNO 1350 3 1011402 HIVE 3NOHd 1011409 1431 100 Olanv 5 1011900 01 100 13SQv3H 10119 lt IHOI 1 1350 10114 MOY 3NOHd 10118 H 91 1431 LNO 1350 10119 0 2 GYVONVIS NOILVMO9IJNOO WOOMN3INI NOILV1OSI 101194 YO4 13SQV3H 310N 33S A A XOvr DIN SSYd Le yowr DIN SSYd 4 5 S 10114029 MOVf OIN 1011409 i cOved O1 NI SIN SSVd NI Oldnv SIN SSVd O1 NI DIN L SSVd NI Oldnv SIN SSVd 01 NI OIGAV SIN 1011402 NI OIGAVY DIN 1011409 DIN 1011402 Ove VW9 3LON 335 107d MOVr OIN 1014 Loved O1 NI SIN 10114 IH NI OIGAVY DIN 10114 NI A3 DIN 1014 O
19. 13 397 8282 Phone 44 0870 851241 FAX 44 0870 851251 GMA 240 Installation Manual Page 1 5 190 00917 01 Rev A Blank Page Page 1 6 GMA 240 Installation Manual Rev A 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 Installation Materials 2 2 1 Equipment Available GMA 240 Audio Panel Ship Level Assembly P N 010 00735 includes the following depending on part number Item 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 e Cables The installer will fabricate and supply all system cables Interconnect wiring diagrams are detailed in Appendix B e 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 In
20. A GARMIN GMA 240 Installation Manua GARMIN GMA 240 eS porri z D ond D ond IMUSIC NAV1 NAV2 AUX1 AUX2 ah 22 MUTE MUSIC mic J VOL EIE inni RADIO TEL MUSIC COPILOT 190 00917 01 June 2008 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 5040 9RB U K 44 0 870 8501241 Garmin AT Inc 2345 Turner Rd SE Salem OR 97302 USA
21. HI 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 AUDIO 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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Page 4 2 GMA 240 Installation Manual Rev 190 00917 01 4 2 2 J2402 Connector Table 4 2 J2402 Pin Assignments 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 AIRCRAFT POWER AIRCRAFT POWER AIRCRAFT GROUND AIRCRAFT GROUND RESERVED PILOT ISO MUSIC IN PILOT ISO MUSIC
22. IN LO Ground Reference for Music 2 Music 1 Input Music 2 Input GMA 240 Installation Manual Page 4 7 190 00917 01 Rev A 4 5 8 Tel Audio I O Connector Pin Name Description P2401 TEL AUDIO IN HI Telephone Audio Input P2401 TEL AUDIO LO Ground Reference for Telephone P2401 TEL MIC AUDIO OUT HI TEL MIC Audio Output 4 5 9 Headset Outputs Connector Pin Name Description PILOT HEADSET AUDIO OUT LEFT PILOT HEADSET AUDIO OUT RIGHT PILOT HEADSET AUDIO OUT 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 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 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 Copilot Headset Audio Output Passenger Headset Audio Output 4 5 10 COM Swap Fin Connector _Finneme __ ___Description COM SWAP IN Ground Through a Momentary PB Switch to Swap Active COM COM 1 or COM 2 COM SWAP RETURN Return Path for PB Switch Page 4 8 GMA 240 Installation Manu
23. IO CUTOUT RACK INSTALLED 1 30 33 0 FROM FRONT OF AIRCRAFT PANEL 6 30 160 0 OPTION 3 NOTES RADIO CUTOUT RACK INSTALLED FROM BACK i PANEL ONLY ME ccn 2 IF THE FRONT LIP OF THE MOUNTING RACK 15 BEHIND THE SURFACE THE AIRCRAFT PANEL THE UNIT IS 125 INCH 3 2 mm CONNECTORS MAY NOT FULLY ENGAGE 6 18 157 0 Figure A 3 GMA 240 Recommended Panel Cutout Dimensions GMA 240 Installation Manual Page A 5 Page A 6 blank 190 00917 01 Rev APPENDIX B INTERCONNECT DRAWINGS 310N 335 sz JOUNOS SNN 12 4 310N 335 as I gt 4 310N 33S a AY SNN H gt ez gt LZ WOO ni 329005 olany ONINYVM 34VS 11 62 gt ON 399005 1931 d S ZOvZd 2 310N 33 Z ON 3OYNOS LN3lV gt H L 304005 LIY 2 68 gt Le gt 8 ON i gt 44 ON 3oNhOS ON N3AI3034 AVN 02 gt 8 L ON M3AI3O3N AVN LI 6 JOV4YILNI 3NOHd313L gt 9 310N 335 gt 08 lt SI Y3AIFOSNWYL WOO gt VI gt gi LL L ON N3AI3OSNVML WOO S 310N 33S gt 6 2 OISAW 304 NMOHS SY 5 SISNW YO OISQW Y04 NMOHS SV TWNYSLX3 NV YSHLIS OL Q3NIM 38 SLNdNI OISQW HIOB ANOHd3141 dl8Vl1NOd V X04 MOVE JIAYLINS OL YO NMOHS 324005
24. ION 5 2 nde ERU de A 1 1 1 15 s iie eene rere Her oe Gebot E 1 1 1 2 Equipment Description 1 1 1 3 Technical Specifications wx 1 2 174 Reference Documents RT PEE 1 4 1 5 Limited Warranty ise o ede Het HR e Cie it dte e Re et itin ete 1 5 2 INSTALLATION OVERVIEW Leo s lil 2 1 2 1 Introduction ig Me ERE HERE LEER elia Ee ets 2 1 2 2 Installation Materials ete ro rete Pe aeta e Ee E RUNE e CENE ET Gab eet oett Feo betta nns 2 1 2 3 GMA 240 Wiring Configuration and Adjustment Options 2 1 24 TE 2 5 2 5 DAO iem citet e e e Eee Hp 2 6 8 INSTALLATION PROCEDURE tette ra aa aria 3 1 3 1 npacking need His i e ed e e ER RR 3 1 32 Electrica Connections iesu Ie DERE ERREUR 3 1 3 3 3Audio ShieldTerminattons niet eec Re RET EH IR PO ERE EISE REGE et RERO BOR ede 3 2 3 4 GMA 240 Installation Je rere e ete eat tert ene A 3 2 3 3 Post Installation CheckoUt cirie eater e ete 3 3 3 6 Configuration Adjustments ea Ere ee Peta reet liter Jocks 3 4 Continued Airworthiness 3 4 4 SYSTEMINTERCONNEGCTS A rider e deep eet 4 1 4 T Connector Description
25. LAR 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 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 Southampton 5040 9RB U K FAX 9
26. LOWSY OL 20 MOV l3NVd INOMI OVE VND OL 3199 55322 GAdIAOYd dO OILVW3HOS 131 NI DISNIN LNO OIN 131 1431 NI ISNAN 01 SNE ABT OL IH SNE 82 OL I SNA A8C 01 A8Z O1 508 ONILHOM O1 A8Z IH 508 9 NILH N A8Z IH AVL Sn8 ONILHONT 01 SNA AVL OL IH SNE AVE OL gt 4 SNA AVL O1 A8Z 01 SNE ONILHOM O1 A8Z IH 508 ONILHOM A8Z IH SNA ONILHOM YIMOd L4VYONIV 82 7 S 310 33S Lu 9 310 33S Vie gt YIMVIYE LINDO TANVd Olanv LL 01 08 61 vi gi QNNOYS L3VMOSIV QNNOYS L3VMOMIV 43MOd LAVYOUIV 43MOd LAVYOUIV NI WOO NO 3 NI x118VN3 3 01 5534 NOLLNE NUNLIY 5 OSI 10114 NI 5 OSI 10114 Ove VW9 91 07 NI xLIBIHNI OSVN Ove VW9 Figure B 1 GMA 240 Interconnect Drawing page 3 of 3 Page B 5 Page B 6 blank GMA 240 Installation Manual Rev 190 00917 01 APPENDIX B INTERCONNECT DRAWINGS GMA240 J2401 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 COM 2 MIC COM 2 AUDIO COM 2 AUDIO COM 1 MIC COM 1 COM 1 AUDIO COM 1 AUDIO AUX2 AUDIO AUX2 AUDIO RESERVED TEL MIC
27. RETURN ALERT 3 AUDIO IN HI PILOT HEADSET AUDIO OUT LEFT RESERVED RESERVED BUTTON PRESS TONE ENABLE IN COM SWAP IN COM SWAP IN RETURN RESERVED MUSIC 1 IN LEFT MUSIC 1 IN RIGHT MUSIC 1 INLO MUSIC 2 IN LEFT MUSIC 2 IN RIGHT MUSIC 2 IN LO FAILSAFE WARN AUDIO IN HI MUTE ON COM TX IN PILOT HEADSET AUDIO OUT RIGHT COPILOT MIC AUDIO IN HI COPILOT MIC KEY IN COPILOT MIC AUDIO IN LO PASS 1 MIC AUDIO IN HI PASS 1 MIC AUDIO IN LO PASS 2 MIC AUDIO IN HI PASS 2 MIC AUDIO IN LO RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED Nj Oo 01 amp Go Po Denotes Active Low Inputs ground to activate Outputs grounded when active GMA 240 Installation Manual Page 4 3 190 00917 01 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 RING MUSIC 1 RIGHT IN TEL AUDIO IN HI SLEEVE MUSIC 1 LO IN TEL 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 Connector Pin Name AIRCRAFT POWER AIRCRAFT POWER POWER GROUND POWER GROUND 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 inter
28. VED RESERVED RESERVED RESERVED RESERVED PASS2MIC PASS2MIC PASS1MIC PASS 1 MIC COPILOT MIC COPILOT MIC PILOT AUDIO IN LO AUDIO IN HI AUDIO IN LO AUDIO INHI AUDIO IN LO KEY IN AUDIO IN HI HEADSET AUDIO OUT RIGHT GMA 240 Installation Manual 190 00917 01 Figure B 2 GMA 240 J2401 amp J2402 Connector Layout Drawing Page B 7 Page B 8 blank Rev A APPENDIX C CONFIGURATION JUMPERS DRAWING Top of Main Board RO300 Bl RO302 RO312 fl RO313 w Jl RO314 ci 22 RO315 ch PILOT KONB Top of Main Board Front Left Corner GMA 240 Installation Manual 190 00917 01 Bottom of Main Board aS Bottom of Main Board Front Right Corner PILOT KNOB Figure C 1 GMA 240 Internal Configuration Jumper Layout Drawing Page C 1 Page C 2 blank Rev A
29. al Rev 190 00917 01 APPENDIX A OUTLINE AND INSTALLATION DRAWINGS i 6 50 as 160 0 e 3 05 77 5 0 10 ba 2 5 3 40 86 4 6 22 157 9 7 12 180 7 20 200 5 08 100 CSK INSIDE 4 34 4 PLACES PER SI 110 2 0 60 x 0 025 15 2 0 64 2 i 1 30 lt gt lE 2 1 28 B pou oso ote 8 9 1 3 49 12 7 33 6 16 5 5 16 131 1 GMA 240 Installation Manual 190 00917 01 Figure A 1 GMA 240 Outline Drawing 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 Page A 3 Page A 4 blank 190 00917 01 Rev A APPENDIX A OUTLINE AND INSTALLATION DRAWINGS OPTION 1 STACK CUTOUT RACK INSTALLED ii 6 30 160 0 gi FROM FRONT OF AIRCRAFT PANEL VAD OPTION 2 RAD
30. alert audio Default operation is recommended COM1 Internal Sidetone Empty 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 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 TEL jack detect bypass 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 Default Description Only Primary If a jumper is supplied in this position the COM mutes RADIO button will mute music only when the MUSIC Primary COM the COM selected for transmission is receiving audio Default RADIO mutes music operatio
31. 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 Page 2 5 190 00917 01 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 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 Rear support is recommended to ensure a sturdy mount Figure 2 2 GMA 340 Unit Rack 115 00262 00 Page 2 6 GMA 240 Installation Manual Rev A 190 00917 01 INSTALLATION PROCEDURE 3 1 Unpacking Unit Carefully unpack the equipment and make a visua
32. connections Connector Pin Name P2402 LIGHTING BUS 14V LO 28V LO P2402 LIGHTING BUS 14V HI 28V LO P2402 LIGHTING BUS 14V HI 28V HI Page 4 4 GMA 240 Installation Manual Rev 190 00917 01 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 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 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 a
33. ctivate 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 P2401 PILOT MIC KEY IN Enables respective MIC audio into P2402 COPILOT MIC KEY IN the selected transceiver unit PILOT MIC AUDIO IN HI Pilot Mic audio input and ground PILOT MIC IN LO reference COPILOT MIC AUDIO IN HI Copilot Mic audio input and ground COPILOT MIC INLO reference PASS 1 MIC AUDIO IN HI Passenger 1 Mic audio and ground PASS 1 MIC AUDIO IN LO reference PASS 2 MIC AUDIO IN HI Passenger 2 Mic audio and ground PASS 2 MIC AUDIO IN LO reference Denotes Active Low Ground to activate 4 5 2 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 Connector Pin Name Description P2402 PILOT ICS KEY IN P2401 COPILOT ICS KEY IN P2401 PASSENGER ICS KEY IN Denotes Active Low Ground to activate Enables respective mic audio to be heard in the intercom 4 5 3 COM Audio and Mic Keys 12 P2401 COM 1 MIC KEY OUT Enables transmission on the 30 P2401 COM 2 MIC KEY OUT respective transceiver unit COM 1 AUDIO IN HI COM
34. ed ICS positions do not hear music Page 2 4 GMA 240 Installation Manual Rev A 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
35. justment is working properly 3 Select an audio source to COM and verify that the sound is muted by active COM 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 4 240 Installation Manual Rev A 190 00917 01
36. l 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 20 28 AWG a Positioner Insertion rimping Tool do bul UNT Military M22520 2 01 M22520 2 09 M81969 1 04 Positronic 9507 9502 3 M81969 1 04 ITT Cannon 995 0001 584 995
37. ll 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 190 00917 00 GMA 240 Pilot s Guide 190 00917 02 GMA 240 Maintenance Manual Page 1 4 GMA 240 Installation Manual Rev A 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 PARTICU
38. n occurs when any selected COM NAV AUX radio is receiving audio Enable KEYED If a jumper is supplied in this position the ICS 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 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 QNS MA a 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 Page 2 3 190 00917 01 Rev A MO 5 O i ALRT 1 ALRT 2 L VO c
39. nical 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 84 mm Rack Width 6 30 inches 160 02 mm Depth Behind Panel with Connectors 7 12 inches 181 mm measured from face of aircraft panel to rear of connector backshells GMA 240 Weight Unit Only 15 5 oz 440 g GMA 240 Weight Installed with rack and 24 oz 680 g connectors Page 1 2 GMA 240 Installation Manual Rev 190 00917 01 1 3 2 Electrical Characteristics Characteristic Specification Temperature Range 20 C to 55 C operation 55 C to 85 C storage Altitude 55 000 Feet Audio Panel Dedicated Transceiver inputs 3 including TEL Functions Dedicated Receiver inputs 4 all independently selectable Alert unswitched inputs 3 each with configurable volume Input impedance 500 Q 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 Q
40. s 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 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
41. sulating type jacks or insulating washers should be used for all jacks to isolate them from aircraft chassis 23 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 e Wiring options Sections 2 3 1 and 4 4 1 e Internal configuration jumpers Section 2 3 1 e Volume Mute adjustments Section 2 3 2 GMA 240 Installation Manual Page 2 1 190 00917 01 Rev A 2 3 1 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 resistor of 0603 size Refer to Appendix for component location Internal Configuration Jumpers 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 gt CAUTION ELECTROSTATIC SENSITIVE DEVICES The GMA 240 contains static sensitive components Observe proper anti static procedures when performing any solder procedures on the unit Component Alert Mutes Music Default Populated Description If this jumper is removed music will not be interrupted by
42. te 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 GMA 240 Installation Manual Rev A 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
43. tz VW9 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 Q3Q33N SI SI 0123 002 31415 IN3YI44IO V 4 YO AMVSS3O3N SI 318VIIVAV ATIVIQYINNOO SI 318VO FIEVLINS V di YFYNLIVANNVN 329IA30 9NDIO3HO YAGISNOD OSIY Q3lJIGON 38 GINOHS 318 9 MOH 304 SV NOILOANNOD 3AO8V ASN JHL OL 39VJjN31NI OL SATALS YOLOANNOD VIO3dS 350 SADIAAG 3WOS SMOVP OlGNV 034315 JSN 1 5321430 804 GYVGNVLS 34V 531972 Q3GIAOMd 3 1 SYIAVIA 04 76 YOLOANNOD 31 15 1 343440 V 4l 318VIIVAV ATIVIOYINNOO SI 318VO YOldvVaV FIEVLINS V di YO YAYNLOVAANVW 3NOHd JHL ONDIIIHI H3GISNOO OSIY 03131 0 38 GINOHS dl8VO CIdIAOYd JHL MOH 304 v SV WVYSVIG NOILO3NNOO 3AO8V ASN INOHd OL JOVANSLNI OL Q3Q33N 335 OL 33dlAONd AYOSSIIIV 335 OL 33GlAONd AYOSSIIIV NOISH3ANOO SIHL di NOILO3NNOO 323ld3V3 OIN JHL dVMS LVHL 5318 2 H3JAOSSONHO JSN SHOVE WW S Z S3NOHd AWOS NOILV309143NOO NOWWOS LSOW SI 318VO WW 62 MOVE WA 572 SVH 3NOHd JHL di 8 GINOHS l13VNOHIV Q3QN3WWOO3M SI 1 31 TVNNVW NOILVTIVISNI 33S 38 AVW 1 ATIVNOILdO ISN SHOVE ONILNNOW NAHM SH3HSVM NOILVINSNI 40 3Sn 3Hl IUINDIY AYN SIHL
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