Installation Manual
Page 5
...-00 2-6 3-1 Audio Shield Termination ...3-2 4-1 Rear View of Backplate and Rack ...4-1 4-2 Rear Connectors J2401 & J2402, Viewed from Back of Unit 4-1 4-3 2.5 mm Plug Used with P2403 ...4-4 A-1 GMA 240 Outline Drawing ...A-1 A-2 GMA 240 Connector/Rack Assembly Drawing A-3 A-3 GMA 240 Recommended Panel Cutout Dimensions A-5 B-1 GMA 240 Interconnect Drawing (page 1 of 3 B-1 B-1 GMA 240 Interconnect Drawing (page 2 of 3 B-3 B-1 GMA 240 Interconnect Drawing (page 3 of 3 B-5 B-2 GMA 240, J2401 & J2402 Connector Layout Drawing B-7 C-1 GMA 240 Internal...
...-00 2-6 3-1 Audio Shield Termination ...3-2 4-1 Rear View of Backplate and Rack ...4-1 4-2 Rear Connectors J2401 & J2402, Viewed from Back of Unit 4-1 4-3 2.5 mm Plug Used with P2403 ...4-4 A-1 GMA 240 Outline Drawing ...A-1 A-2 GMA 240 Connector/Rack Assembly Drawing A-3 A-3 GMA 240 Recommended Panel Cutout Dimensions A-5 B-1 GMA 240 Interconnect Drawing (page 1 of 3 B-1 B-1 GMA 240 Interconnect Drawing (page 2 of 3 B-3 B-1 GMA 240 Interconnect Drawing (page 3 of 3 B-5 B-2 GMA 240, J2401 & J2402 Connector Layout Drawing B-7 C-1 GMA 240 Internal...
Installation Manual
Page 6
... date on the Garmin Dealer Resource web site at the time of publication of the modification. MOD LEVEL SERVICE BULLETIN NUMBER SERVICE BULLETIN DATE PURPOSE OF MODIFICATION Page iv Revision B GMA 240 Installation Manual 190-00917-01 GMA 240 HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification (Mod) Levels for the GMA 240 Audio Panel. Mod Levels...
... date on the Garmin Dealer Resource web site at the time of publication of the modification. MOD LEVEL SERVICE BULLETIN NUMBER SERVICE BULLETIN DATE PURPOSE OF MODIFICATION Page iv Revision B GMA 240 Installation Manual 190-00917-01 GMA 240 HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification (Mod) Levels for the GMA 240 Audio Panel. Mod Levels...
Installation Manual
Page 7
... circuitry automatically adjusts the brightness of the unit. The brightness 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 turned off. Figure 1-1. GMA 240 Unit View GMA 240 Installation Manual 190-00917-01 Page 1-1 Rev. Information pertaining to the maintenance of the unit can be found...
... circuitry automatically adjusts the brightness of the unit. The brightness 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 turned off. Figure 1-1. GMA 240 Unit View GMA 240 Installation Manual 190-00917-01 Page 1-1 Rev. Information pertaining to the maintenance of the unit can be found...
Installation Manual
Page 8
... 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 Characteristic Bezel Height Bezel Width Rack Height (Dimple to Dimple) Rack Width Depth Behind Panel with Connectors (measured from face of aircraft panel to rear of connector backshells) GMA 240 Weight (Unit Only) GMA 240 Weight...
... 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 Characteristic Bezel Height Bezel Width Rack Height (Dimple to Dimple) Rack Width Depth Behind Panel with Connectors (measured from face of aircraft panel to rear of connector backshells) GMA 240 Weight (Unit Only) GMA 240 Weight...
Installation Manual
Page 9
...: 2 (pilot, copilot/passengers) VOX circuits: 4 (one per mic input) Microphone input impedance: 450 Ω (compatible with 150 to +85°C (storage) Altitude 55,000 Feet Audio Panel Functions Dedicated Transceiver inputs: 3 (including TEL) Dedicated Receiver inputs: 4 (all , crew) Telephone interfaces: 1 full-duplex (use LRU pins or front jack) Headphone Outputs Output amplifiers...
...: 2 (pilot, copilot/passengers) VOX circuits: 4 (one per mic input) Microphone input impedance: 450 Ω (compatible with 150 to +85°C (storage) Altitude 55,000 Feet Audio Panel Functions Dedicated Transceiver inputs: 3 (including TEL) Dedicated Receiver inputs: 4 (all , crew) Telephone interfaces: 1 full-duplex (use LRU pins or front jack) Headphone Outputs Output amplifiers...
Installation Manual
Page 13
...insulating washers should be used for the installation and checkout of the GMA 240 Audio Panel. B Section 2.3.1 • Volume/Mute adjustments - Installation of the GMA 240 will be discussed with the end user(s) of these options should ...GMA 240 Audio Panel, Ship Level Assembly, P/N 010-00735-() includes the following sections: • Wiring options - These configuration/adjustments are detailed in the following , depending on part number: Item Connector Kit, GMA 340 Rack Backplate, GMA 340 Unit Assembly, GMA 240 Audio Cables, 2.5 mm RA Stereo Plug Install Rack, GMA 340 Garmin...
...insulating washers should be used for the installation and checkout of the GMA 240 Audio Panel. B Section 2.3.1 • Volume/Mute adjustments - Installation of the GMA 240 will be discussed with the end user(s) of these options should ...GMA 240 Audio Panel, Ship Level Assembly, P/N 010-00735-() includes the following sections: • Wiring options - These configuration/adjustments are detailed in the following , depending on part number: Item Connector Kit, GMA 340 Rack Backplate, GMA 340 Unit Assembly, GMA 240 Audio Cables, 2.5 mm RA Stereo Plug Install Rack, GMA 340 Garmin...
Installation Manual
Page 14
... adjustments may be made by a qualified technician. Many phones supply sidetone when a call is recommended. Page 2-2 Rev. Garmin is not responsible for damage caused during adjustment of sidetone from a radio that will be used in the front jack regardless...audio panel is in use in the installation. Observe proper anti-static procedures when performing any solder procedures on the PCB. If a jumper is usually not disruptive. B GMA 240 Installation Manual 190-00917-01 This should only be interrupted by alert audio. The jumper positions are designed to the GMA 240...
... adjustments may be made by a qualified technician. Many phones supply sidetone when a call is recommended. Page 2-2 Rev. Garmin is not responsible for damage caused during adjustment of sidetone from a radio that will be used in the front jack regardless...audio panel is in use in the installation. Observe proper anti-static procedures when performing any solder procedures on the PCB. If a jumper is usually not disruptive. B GMA 240 Installation Manual 190-00917-01 This should only be interrupted by alert audio. The jumper positions are designed to the GMA 240...
Installation Manual
Page 15
... The following adjustments can be heard when the corresponding ICS KEY for the MIC position is pressed. GMA 240 Installation Manual 190-00917-01 Page 2-3 Rev. Alert 1 Volume 2. Front panel jack TEL input volume 6. MASQ (Master Avionics SQuelch) mute level Refer to Figure 2-1 for transmission...against unintended components or circuit board paths. If a jumper is receiving audio. When this position, the RADIO button will mute music only when the Primary COM (the COM selected for the location of the GMA 240: 1. Rear connector TEL input volume 5. Damage to be made through...
... The following adjustments can be heard when the corresponding ICS KEY for the MIC position is pressed. GMA 240 Installation Manual 190-00917-01 Page 2-3 Rev. Alert 1 Volume 2. Front panel jack TEL input volume 6. MASQ (Master Avionics SQuelch) mute level Refer to Figure 2-1 for transmission...against unintended components or circuit board paths. If a jumper is receiving audio. When this position, the RADIO button will mute music only when the Primary COM (the COM selected for the location of the GMA 240: 1. Rear connector TEL input volume 5. Damage to be made through...
Installation Manual
Page 16
... selected, the copilot's headphone jack must be wired in parallel with the pilot headset output. CREW ISO: This input configures the audio panel for implementing these inputs is selected, the pilot and copilot will hear each other but will be wired to chassis through a suitable ... option is configured). Access Hole Location (Top View) 2.3.3 Hardwire Configuration Option The following configuration options are wired as a troubleshooting tool. B GMA 240 Installation Manual 190-00917-01 Figure 2-1. Normally, the isolated ICS positions do not exceed the MASQ threshold.
... selected, the copilot's headphone jack must be wired in parallel with the pilot headset output. CREW ISO: This input configures the audio panel for implementing these inputs is selected, the pilot and copilot will hear each other but will be wired to chassis through a suitable ... option is configured). Access Hole Location (Top View) 2.3.3 Hardwire Configuration Option The following configuration options are wired as a troubleshooting tool. B GMA 240 Installation Manual 190-00917-01 Figure 2-1. Normally, the isolated ICS positions do not exceed the MASQ threshold.
Installation Manual
Page 17
... signal returns share the same path as large currents from other equipment. Single-point grounding cannot be overstressed for COM transmit. 2.4 Noise Because the audio panel is detected. GMA 240 Installation Manual 190-00917-01 Page 2-5 Rev. Good aircraft electrical/charging system ground bonding is the main reason why all selected radios (COM, NAV...
... signal returns share the same path as large currents from other equipment. Single-point grounding cannot be overstressed for COM transmit. 2.4 Noise Because the audio panel is detected. GMA 240 Installation Manual 190-00917-01 Page 2-5 Rev. Good aircraft electrical/charging system ground bonding is the main reason why all selected radios (COM, NAV...
Installation Manual
Page 21
... another passenger plugs in mono mode. Verify that the failsafe warning is heard in a stereo jack, the audio panel's right channel output is optimized for errors before inserting the GMA 240 into the rack. 3.5 Post Installation Checkout CAUTION Check wiring connections for low-power operation in systems with limited power budgets. An in-aircraft...
... another passenger plugs in mono mode. Verify that the failsafe warning is heard in a stereo jack, the audio panel's right channel output is optimized for errors before inserting the GMA 240 into the rack. 3.5 Post Installation Checkout CAUTION Check wiring connections for low-power operation in systems with limited power budgets. An in-aircraft...
Installation Manual
Page 22
... corresponding to MUSIC 1 (ensure the front panel jack is empty and the music volume knob is not set by intercom audio when ICS music mute is on . 5. Connect a stereo audio source to each ICS position. Verify that stereo audio is heard when MUSIC 2 is selected as the music source and MUSIC LED is... helicopter operation using a two-stage Intercom/PTT switch, prior to using the keyed-intercom mode, the VOX level should be made to the GMA 240 Maintenance Manual (Garmin P/N 190-00917-02) as the music source and MUSIC LED is on the right side small knob and verify that the sound is muted...
... corresponding to MUSIC 1 (ensure the front panel jack is empty and the music volume knob is not set by intercom audio when ICS music mute is on . 5. Connect a stereo audio source to each ICS position. Verify that stereo audio is heard when MUSIC 2 is selected as the music source and MUSIC LED is... helicopter operation using a two-stage Intercom/PTT switch, prior to using the keyed-intercom mode, the VOX level should be made to the GMA 240 Maintenance Manual (Garmin P/N 190-00917-02) as the music source and MUSIC LED is on the right side small knob and verify that the sound is muted...
Pilot's Guide
Page 4
GMA 240 Audio Panel Pilot's Squelch Knob ON/OFF and Pilot's Volume Knob Copilot/ Passenger Squelch Knob Copilot/ Passenger/ Music Volume Knob Music On/ Off Key Com Receiver Monitor Mute Nav Receiver and Keys Key AUX Audio Keys Music 1 or 2 Select Key Transceiver Telephone Selection Keys Key Pilot ICS Isolation Key Intercom Music Audio Mute Key and...
GMA 240 Audio Panel Pilot's Squelch Knob ON/OFF and Pilot's Volume Knob Copilot/ Passenger Squelch Knob Copilot/ Passenger/ Music Volume Knob Music On/ Off Key Com Receiver Monitor Mute Nav Receiver and Keys Key AUX Audio Keys Music 1 or 2 Select Key Transceiver Telephone Selection Keys Key Pilot ICS Isolation Key Intercom Music Audio Mute Key and...
Pilot's Guide
Page 5
... Garmin GMA 240 Pilot's Guide 5 Pressing a COM receiver key selects the receiver, which input is heard in addition to be heard. NAV receiver and AUX keys. Master Music key. Music 1/TEL jack. When selected, music is muted during reception of the transceivers is muted during Intercom operation. GMA 240 Audio Panel.... Selects Music input 1 or 2. Transceiver selection keys. Mutes all other monitored receivers when the active transceiver receives audio. Music Source 1 or 2 selection key and Music Source Annunciators. Pressing a key selects the Nav receiver or AUX...
... Garmin GMA 240 Pilot's Guide 5 Pressing a COM receiver key selects the receiver, which input is heard in addition to be heard. NAV receiver and AUX keys. Master Music key. Music 1/TEL jack. When selected, music is muted during reception of the transceivers is muted during Intercom operation. GMA 240 Audio Panel.... Selects Music input 1 or 2. Transceiver selection keys. Mutes all other monitored receivers when the active transceiver receives audio. Music Source 1 or 2 selection key and Music Source Annunciators. Pressing a key selects the Nav receiver or AUX...
Pilot's Guide
Page 6
...headset, microphone, and PTT directly to -talk (PTT) switch must be configured in altering the configuration settings. Microphones The GMA 240 Audio Panel can accept up to four (4) microphone inputs, allowing for a two-person crew and up to radio squelch circuitry, MASQTM...annunciators indicate when a key function is a headphones only audio control panel. A push-to COM 1 and the fail-safe alert audio, such as an autopilot disconnect tone. GMA 240 Audio Panel Features and Operation The Garmin GMA 240 is selected. Contact a Garmin-authorized service center for additional avionics or...
...headset, microphone, and PTT directly to -talk (PTT) switch must be configured in altering the configuration settings. Microphones The GMA 240 Audio Panel can accept up to four (4) microphone inputs, allowing for a two-person crew and up to radio squelch circuitry, MASQTM...annunciators indicate when a key function is a headphones only audio control panel. A push-to COM 1 and the fail-safe alert audio, such as an autopilot disconnect tone. GMA 240 Audio Panel Features and Operation The Garmin GMA 240 is selected. Contact a Garmin-authorized service center for additional avionics or...
Pilot's Guide
Page 7
... power supply fuses may also be powered ON and OFF with the Pilot ICS Volume Knob. The active COM audio is controlled by pressing the COM1 or COM2 receiver keys. A Garmin GMA 240 Pilot's Guide 7 When wired correctly, the use of the passenger positions, anyone else listening on the Pilot ... for microphone use of the detent to turn ON. The unit may be selected independently by the selected COM radio volume control. GMA 240 Audio Panel Mono/Stereo Headsets The unit can be damaged. If monaural headsets are plugged into the detent to turn OFF. Once the self-...
... power supply fuses may also be powered ON and OFF with the Pilot ICS Volume Knob. The active COM audio is controlled by pressing the COM1 or COM2 receiver keys. A Garmin GMA 240 Pilot's Guide 7 When wired correctly, the use of the passenger positions, anyone else listening on the Pilot ... for microphone use of the detent to turn ON. The unit may be selected independently by the selected COM radio volume control. GMA 240 Audio Panel Mono/Stereo Headsets The unit can be damaged. If monaural headsets are plugged into the detent to turn OFF. Once the self-...
Pilot's Guide
Page 8
... provides two modes of Pilot Isolation. GMA 240 Audio Panel When a microphone is keyed, the active transceiver's MIC key LED blinks approximately once per second indicating the PTT is no isolation and every occupant can communicate with every other occupant. 8 Garmin GMA 240 Pilot's Guide 190-00917-00 Rev.... When configured for Crew Isolation, the Pilot and Copilot can be configured for the desired audio level. In ALL mode, there is pressed. A ICS squelch ...
... provides two modes of Pilot Isolation. GMA 240 Audio Panel When a microphone is keyed, the active transceiver's MIC key LED blinks approximately once per second indicating the PTT is no isolation and every occupant can communicate with every other occupant. 8 Garmin GMA 240 Pilot's Guide 190-00917-00 Rev.... When configured for Crew Isolation, the Pilot and Copilot can be configured for the desired audio level. In ALL mode, there is pressed. A ICS squelch ...
Pilot's Guide
Page 9
Press the TEL Key to mute the music during intercom operation. A Garmin GMA 240 Pilot's Guide 9 Selected Radios, Alerts, Telephone, Pilot, Copilot, Passengers, Music Copilot, Passengers, Music Passengers, Music ICS Isolation Modes & Telephone Distribution Telephone The GMA 240 provides a full-duplex telephone interface. When the telephone is much like using ... Radios, Alerts, Telephone, Copilot, Pilot, Music* *A configuration option can allow music for Pilot or Crew isolation, depending on the ICS mode. GMA 240 Audio Panel Press the ICS Key to activate telephone operation.
Press the TEL Key to mute the music during intercom operation. A Garmin GMA 240 Pilot's Guide 9 Selected Radios, Alerts, Telephone, Pilot, Copilot, Passengers, Music Copilot, Passengers, Music Passengers, Music ICS Isolation Modes & Telephone Distribution Telephone The GMA 240 provides a full-duplex telephone interface. When the telephone is much like using ... Radios, Alerts, Telephone, Copilot, Pilot, Music* *A configuration option can allow music for Pilot or Crew isolation, depending on the ICS mode. GMA 240 Audio Panel Press the ICS Key to activate telephone operation.
Pilot's Guide
Page 10
GMA 240 Audio Panel Entertainment Inputs The GMA 240 provides two stereo entertainment inputs; The MUSIC 1 and MUSIC 2 rear inputs may be heard. The headphone outputs of music volume and a gradual return to the ... which music source is selected. 10 Garmin GMA 240 Pilot's Guide 190-00917-00 Rev. Either music source may be wired to either the MUSIC 1 or MUSIC 2 input. Press the MUSIC 1-2 Key to disable music audio. A MUSIC 1 and MUSIC 2. A MUSIC 1/TEL jack is also located on the GMA 240 front panel. A music source plugged into the MUSIC...
GMA 240 Audio Panel Entertainment Inputs The GMA 240 provides two stereo entertainment inputs; The MUSIC 1 and MUSIC 2 rear inputs may be heard. The headphone outputs of music volume and a gradual return to the ... which music source is selected. 10 Garmin GMA 240 Pilot's Guide 190-00917-00 Rev. Either music source may be wired to either the MUSIC 1 or MUSIC 2 input. Press the MUSIC 1-2 Key to disable music audio. A MUSIC 1 and MUSIC 2. A MUSIC 1/TEL jack is also located on the GMA 240 front panel. A music source plugged into the MUSIC...
Pilot's Guide
Page 11
...volume can be selected independently for the crew in place of button presses. • Alert Music Mute - A Garmin GMA 240 Pilot's Guide 11 Enable music audio to transfer the active microphone between COM1 MIC and COM2 MIC. • COM muting on the other selected radios ... is used to be heard by alert audio. Some options include a Pilot operable pushbutton or toggle switch or might be adjusted individually for the MIC position is also adjustable. • Internal Sidetone - GMA 240 Audio Panel GMA 240 PROGRAMMING OPTIONS Programming options include variable configurations that...
...volume can be selected independently for the crew in place of button presses. • Alert Music Mute - A Garmin GMA 240 Pilot's Guide 11 Enable music audio to transfer the active microphone between COM1 MIC and COM2 MIC. • COM muting on the other selected radios ... is used to be heard by alert audio. Some options include a Pilot operable pushbutton or toggle switch or might be adjusted individually for the MIC position is also adjustable. • Internal Sidetone - GMA 240 Audio Panel GMA 240 PROGRAMMING OPTIONS Programming options include variable configurations that...