Garmin GMA 340 Installation Manual

Also see for GMA 340: Pilot's guide Supplemental operation manual Pilot's guide Pilot's guide Pilot's guide

GMA 340 Installation Manual Page B-9 (Page B-10 blank)190-00149-01 Rev LFigure B4. J1 INTERCONNECT WIRING DIAGRAMEXT AMBER LAMP (M)MKR ANTMKR ANT RETURNMASQ INHNCCOM 1TransceiverCOM 2COM 3NAV 1 RadioDME RadioJ1MIDDLE MKR SENSGND LUGPTT2526910111227281314153023243456171819202122783132444335343341404236373839121629(up to 4 jacks,wired in parallel)1. UNLESS OTHERWISE INDICATED, ALL SHIELDS MUST BE TERMINATED AT THE GMA 340 END ONLY.2. ALL WIRE SIZE SHOULD BE AWG 24 OR LARGER, TEFLON INSULATED, EXCEPT FOR THE FOLLOWING:J2 PINS 8, 9. 10, 11 (AWG 22, TEFLON INSULATED)J2 PINS 43, 44 (AWG 22, TEFLON INSULATED)3. SOME COMMUNICATION TRANSCEIVERS REQUIRE THEIR SPEAKER OUTPUT TO BE LOADED FORPROPER OPERATION. THE GMA 340 PROVIDES INTERNAL DUMMY LOADS FOR THIS PURPOSE.CONNECT ONLY IF REQUIRED. REFER TO TRANSCEIVER DOCUMENTATION.4. CONNECT LIGHTING BUS AS SHOWN IN THE FOLLOWING TABLE:5. ALL HEADSET, MICROPHONE, AND MUSIC PHONE PLUGS MUST BE ELECTRICALLY ISOLATED FROMGROUND. THIS MAY REQUIRE THE USE OF INSULATING WASHERS WHEN MOUNTING THE PHONEPLUGS. ADDITIONALLY, THE SPEAKER RETURN MUST BE ISOLATED FROM GROUND.6. PA MUTE IS AN OUTPUT FROM THE GMA 340 THAT IS PULLED LOW WHEN ACTIVE. IT IS USED TOTRIGGER THE MUTE FUNCTION ON AN EXTERNAL PA SYSTEM.7. NORMALLY, ANY ICS (INTERCOM) ACTIVITY WILL CAUSE THE MUSIC 1 SOURCE TO BE MUTED. IF THISIS NOT DESIRED, THEN J2 PIN 13 MUST BE CONNECTED TO J2 PIN 14, EITHER PERMANENTLY, OR VIAA SWITCH.8. J2 PIN 17 (8 OHM SELECT*) IS ONLY FOR USE IN INSTALLATIONS WHERE AN 8 OHM CABIN SPEAKER ISINSTALLED. THE FUNCTION ALLOWS THE SAME POWER TO BE DELIVERED TO AN 8 OHM SPEAKER ASWOULD NORMALLY BE DELIVERED TO A 4 OHM SPEAKER. IF AN 8 OHM SPEAKER IS USED AND THESPEAKER VOLUME IS ACCEPTABLE, THEN THIS PIN SHOULD BE LEFT OPEN. IF AN 8 OHM CABINSPEAKER IS USED, BUT MORE SPEAKER VOLUME IS DESIRED, THEN J2 PIN 17 MUST BE TIED TOGROUND AND THE SPEAKER VOLUME SHOULD BE READJUSTED. DO NOT GROUND J2 PIN 17 IN A 4OHM CABIN SPEAKER INSTALLATION.9. J2 PIN 19 (TONE ENABLE*) CAN BE LEFT OPEN OR TIED TO GROUND. IF TIED TO GROUND, THEN ASHORT AUDIBLE TONE WILL BE HEARD IN THE PILOT AND COPILOT HEADSETS EACH TIME A BUTTONIS PRESSED. IF LEFT OPEN, NO TONE IS HEARD.10. USE COAX MEETING THE APPLICABLE AVIATION REGULATION FOR THE MARKER BEACON ANTENNACABLE. WHEN ROUTING THE MARKER BEACON ANTENNA CABLE, AVOID SHARP CORNERS ANDROUTE AWAY FROM HIGH CURRENT WIRING AND ANY TRANSMITTER ANTENNA CABLES.11. PINS 31 AND 32 OF J1 ARE UNSWITCHED, UNMUTED INPUTS. PINS 43 AND 44 OF J1 ARE UNSWITCHEDINPUTS.12. J2 PINS 10 AND 11 SHOULD BE CONNECTED DIRECTLY TO THE AIRFRAME USING MINIMUM WIRELENGTH.340, 340HTransceiverNAV 2 RadioADF RadioNOTES PERTAINING TO J1 AND J2VOLTAGE LOW SIDE OF BUS28V LIGHTING J2 PIN 714V LIGHTING J2 PINS 6 AND 7J2 PINS 5 AND 6J2 PIN 5HIGH SIDE OF BUSTransceiverAltitude Warning AudioTelephone AudioEXT IndicatorFLT CTRL SystemMarker Beacon AntennaSee note 14EXT BLUE LAMP (O)EXT WHITE LAMP (A)PASS HEADSET RETURNPASS HEADSET RPASS HEADSET LPILOT MIC KEYPILOT MIC RETURNPILOT MIC INTEL RINGER RETURNTEL RINGER INALT WRN RETURNALT WRN INADF RETURNADF INDME RETURNDME INNAV 1 RETURNNAV 1 INNAV 2 RETURNNAV 2 INCOM 3 MICCOM 3 KEYCOM 1 SPKR LOADCOM 1 SPKR LOAD RETURNCOM 2 SPKR LOAD RETURNCOM 3 RETURNCOM 3 INCOM 2 MICCOM 2 KEYCOM 2 RETURNCOM 2 INCOM 1 MICCOM 1 KEYCOM 1 RETURNCOM 1 INCOM 2 SPKR LOADCOM 3 SPKR LOADCOM 3 SPKR LOAD RETURNSee note 3See note 3See note 3