Garmin GMA 347, Maintenance Manual

Page 1: ...190 00325 02 September 2009 Revision A GMA 347 AUDIO PANEL MAINTENANCE MANUAL ...

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Page 3: ...ctronic 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 Kansas 66062 Order Desk Technical Support Telephone 913 397 8200 Telephone Toll Free 888 606 5482 Facsimile 913 3...

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Page 5: ...rker Beacon Receiver 2 1 2 1 4 Smart Mute 2 1 2 1 5 MUSIC 1 and MUSIC 2 Controls 2 2 2 1 6 Fail Safe Operation 2 2 2 2 Audio Panel Controls 2 3 2 3 Theory of Operation 2 5 SECTION 3 TROUBLESHOOTING 3 1 Test Conditions 3 1 3 1 1 Test Setup 3 1 3 1 2 Rear Chassis Connectors 3 1 3 2 Test Procedures 3 6 3 2 1 Power Checks 3 6 3 2 2 Front Panel Assembly Tests 3 6 3 2 3 Failsafe Operation 3 7 3 2 4 Tran...

Page 6: ...________________________________________________ iv SECTION 4 REPAIR 4 1 Tools 4 1 4 2 Disassembly and Assembly 4 1 4 2 1 Disassembly 4 1 4 2 2 Reassembly 4 4 4 3 Service Parts List 4 4 4 4 Return To Service Testing 4 4 ...

Page 7: ... inside or outside of the United States without first obtaining an export license RECORD OF REVISIONS Revision Date Section Page Description A 9 23 09 Initial Release SERVICE BULLETIN HISTORY The following table identifies hardware service bulletins for the GMA 347 Audio Panel The table below is subject to change without notice Authorized Garmin Sales and Service Centers are encouraged to access t...

Page 8: ...DER 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 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 t...

Page 9: ...7 models the GMA 347 in black or grey bezel GMA 347H helicopter and the GMA 347 white LED Each model is identified by a different part number see Table 1 1 The GMA 347 is the standard model which is available with a black or a grey bezel The GMA 347H helicopter version has the pilot and copilot control knobs on the front panel reversed from the standard GMA 347 and is available with a black bezel ...

Page 10: ...al is written for field shops not equipped with Garmin Automated Test Equipment ATE and not having access to Garmin proprietary repair documentation Send the unit to Garmin for repair when any troubleshooting testing or repair falls outside the scope of this manual 1 3 FACTORY REPAIR A Return Merchandise Authorization RMA number must be requested from Garmin before a unit is returned Units returne...

Page 11: ...es for the unit Should the unit be missing a previous software update that was required the unit will be eligible for reimbursement for the time allotted on the last required software change up to one hour provided that the most current software version is installed If more than one software is being updated example main and GPS on a unit reimbursement will be limited to up to one hour combined de...

Page 12: ..._________________________________________________________________ Page 1 4 GMA 347 Maintenance Manual Rev A 190 00325 02 Blank Page ...

Page 13: ...al Voice Recorder The audio panel contains a digital voice recorder with playback capability providing up to two and a half minutes of recording The playback feature is controlled by pressing the PLAY button or a remote mounted switch Recording is automatic when a COM signal is received The recorder can be disabled using an external switch 2 1 3 Marker Beacon Receiver A marker beacon receiver with...

Page 14: ... 1 or MUSIC 2 jacks Only the pilot and copilot can hear MUSIC 1 MUSIC 2 is a non muted input heard only by the passengers MUSIC 1 and MUSIC 2 characteristics are affected by the active intercom mode MUSIC 1 is soft muted when an interruption occurs from an aircraft radio Soft muting is the gradual return of MUSIC 1 to its original volume level MUSIC 1 can also be configured to mute during ICS acti...

Page 15: ...utomatic Annunciator Dimming 6 Aircraft Radio Audio Selection Buttons NAV 1 NAV 2 DME ADF 7 Digital Recording Playback Button 8 Copilot and Passenger ICS Volume Control Pull out for Passenger Volume 9 Copilot and Passenger VOX Intercom Squelch Level 10 Copilot Isolation Intercom Mode Button 11 Pilot Isolation Intercom Mode Button 12 Speaker Function Button 13 Telephone Distribution to Pilot s Inte...

Page 16: ...00325 02 15 Pawl Latch Access 16 Transmitter Audio Mic Selection Buttons 17 Marker Beacon Receiver Sensitivity 18 Pilot ICS Voice Activated Transmission VOX Intercom Squelch Level 19 Unit On Off Pilot Intercom System ICS Volume Automatic Manual Squelch Toggle 20 Marker Beacon Receiver Hi Sensitivity Indicator LED ...

Page 17: ...N The audio panel contains three major replaceable assemblies Main Board Assembly Audio Board Assembly Front Panel Board Assembly The three major assemblies are shown in the block diagram in Figure 2 2 Figure 2 2 GMA 347 Block Diagram GMA 347 Maintenance Manual Page 2 5 190 00325 02 Rev A ...

Page 18: ... provides audio switching and mode control a Class D switching Audio Amp and the Marker Beacon Receiver Audio Board Assembly The Audio Board Assembly contains all circuitry necessary to perform the audio switching and isolation functions FPGA comparators switches drivers and amplifiers Front Panel Board Assembly The Front Panel Board Assembly contains the panel lighting button annunciator LEDs and...

Page 19: ...ignment of the Audio Panel 3 1 TEST CONDITIONS 3 1 1 Test Setup Recommended Test Equipment Standard avionics shop equipment or suitable substitutes is used to test the unit Test bench harnesses test fixtures and test panels are supplied by the field shop Rear chassis connector pin information can aid in their fabrication Figure 3 1 Tables 1 1 and 1 2 3 1 2 Rear Chassis Connectors Figure 3 1 shows ...

Page 20: ...T Out 10 PILOT HEADSET AUDIO OUT RIGHT Out 11 PILOT HEADSET AUDIO OUT LO Out 12 CROSS SIDE COM AUDIO IN HI In 13 CROSS SIDE COM AUDIO LO I O 14 CROSS SIDE NAV AUDIO IN HI In 15 DME AUDIO IN HI In 16 DME AUDIO IN LO In 17 MUSIC IN 1 LEFT In 18 MUSIC IN 1 RIGHT In 19 UNSWITCHED AUDIO IN 1 HI In 20 UNSWITCHED AUDIO IN 2 HI In 21 RESERVED 22 RESERVED 23 TEL MIC AUDIO OUT HI Out 24 PASS ICS KEY In 25 O...

Page 21: ...OT ICS KEY In 53 RESERVED 54 ALTITUDE WARN AUDIO IN HI In 55 ALTITUDE WARN AUDIO IN LO In 56 MUSIC IN 2 LEFT In 57 MUSIC IN 2 RIGHT In 58 COM 3 AUDIO IN HI In 59 COM 3 AUDIO LO I O 60 RESERVED 61 RESERVED 62 TEL MIC AUDIO OUT LO Out 63 PASS 4 MIC AUDIO IN HI In 64 PASS 4 MIC AUDIO IN LO In 65 PASS 2 MIC AUDIO IN HI In 66 PASS 2 MIC AUDIO IN LO In 67 PASS HEADSET AUDIO OUT LEFT Out 68 PASS HEADSET ...

Page 22: ...OGRAM GROUND 4 RECORDER PLAY In 5 PROGRAM GROUND 6 RS 232 OUT 1 Out 7 RS 232 IN 1 In 8 RESERVED 9 RESERVED 10 RESERVED 11 PROGRAM GROUND 12 RESERVED 13 RESERVED 14 POWER GROUND 15 RESERVED 16 POWER GROUND 17 COM SWAP In 18 PROGRAM GROUND 19 RESERVED 20 RESERVED 21 CONFIG MODULE POWER OUT Out 22 RESERVED 23 PROGRAM GROUND 24 RECORDER OFF SELECT In 25 PROGRAM GROUND 26 AUX SOURCE SELECT In 27 RESERV...

Page 23: ... RESERVED 51 14 V LIGHTING HI In 52 28 V LIGHTING HI In 53 AIRCRAFT POWER 1 In 54 RESERVED 55 AIRCRAFT POWER 1 In 56 RESERVED 57 GROUND RETURN 58 RESERVED 59 MARKER ANTENNA LO In 60 CONFIG MODULE CLOCK Out 61 RESERVED 62 RESERVED 63 RESERVED 64 PA MUTE OUT Out 65 RESERVED 66 RESERVED 67 PROGRAM GROUND 68 RESERVED 69 POWER GROUND 70 RESERVED 71 POWER GROUND 72 RESERVED 73 RESERVED 74 AIRWAY INNER M...

Page 24: ...ld not exceed the values listed in the table below Note current is to be measured as the total current going through both aircraft power 1 inputs J3472 Pins 53 and 55 Audio Panel powered by Aircraft Power 1 All annunciators active Audio Panel in PA mode with a sufficient MIC signal applied to achieve 10W into 4Ω Backlighting set to maximum Middle Marker Lamp output active into a 56 Ω load UNIT STA...

Page 25: ...n Check 1 Turn the unit off by rotating the pilot intercom knob counter clockwise 2 Check the failsafe operation by exercising the COM 1 microphone microphone key and monitoring received COM 1 audio over the headphone s left earpiece 3 Turn the unit back on to continue testing 3 2 4 Transceiver Operational Check 1 Perform a ramp test radio check by exercising the installed transceivers microphone ...

Page 26: ... 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 3 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 4 Connect a stereo music source to MUSIC 2 Verify that stereo audio is heard when ...

Page 27: ...hing the cover 2 to the chassis 3 and remove the cover Replace the damping pad 4 if necessary 2 Remove the audio board center screw 5 3 Remove the two screws 6 attaching the audio board external connector to the chassis 3 4 Disconnect the ribbon cable 7 from the audio board 8 5 Remove the audio board 8 Remove the Main Board 1 Remove the audio board 8 2 Disconnect the front panel flex cable see fig...

Page 28: ... a 7 16 nut driver or deep well socket remove the two nuts not shown attaching each control shaft to the front panel 3 Remove four screws 12 attaching the front panel sub assembly 13 to the chassis 4 Disconnect the main board interface cable see figure 4 1 from the front panel sub assembly 13 and the control shaft 5 Remove the front panel sub assembly 13 Replace the two crescent spring washers not...

Page 29: ..._________________________________________________________________ Figure 4 1 Audio Panel Final Assembly Drawing GMA 347 Maintenance Manual Page 4 3 190 00325 02 Rev A ...

Page 30: ... 00 Svce PCB Assy GMA347 Audio 9 012 00550 00 S12 00550 00 Svce PCB Assy GMA347 Main REF 012 00685 99 S12 00685 99 PCB Assy FlxCkt Common GMAx347 2 115 00503 00 115 00503 00 SMP Cover Assy GMA347 REF 210 00021 00 210 00021 00 Nut Hex Reduced M7 1 5 10 211 60234 08 211 60234 08 Screw 4 40x 250 PHP SS P w NYL 12 211 60334 05 211 60334 05 Screw 4 40x 156 PHP STD SS BO w Nylon 6 211 63234 10 211 63234...