Bose 400521 Bluetooth Headset User Manual

Bose Corporation Bluetooth Headset

Manual

A20™ AVIATION HEADSETOwner’s Guide©2010 Bose Corporation, The Mountain,Framingham, MA 01701-9168 USAAM325664 Rev.00
iTab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10SAFETY INFORMATIONNOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:– Reorient or relocate the receiving antenna.– Increase the separation between the equipment and receiver.– Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.– Consult the dealer or an experienced radio/TV technician for help.Changes or modifications not expressly approved by Bose Corporation could void the user's authority to operate this equipment.Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.Bose Corporation hereby declares that this product is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC and other applicable Directives. The complete Declaration of Conformity can be found at www.Bose.com/compliance.COFETEL CFT/D03/USI/DGB/xxxx/xxOperate this product within the temperature range of 5°F to 131°F (-15°C to 55°C) only.Important Safety Instructions• Please read these instructions carefully and completely before using the headset• Make these instructions easily accessible to all users at all times. Always include these instructions when passing the headset on to third parties.• During flight operations, do not use the headset for telephone calls.• It is the responsibility of each aircraft operator or pilot in command to determine that any and all portable devices will be free of any interference with the navigation or communication system of the aircraft. In addition, it is their responsibility to determine the suitability of the performance of portable devices in relation to the use of the Bose A20 Headset.• The headset is capable of producing sound pressure levels exceeding 85dB(A). In many countries 85dB(A) is the maximum legally permissible level for continuous noise exposure during the working day. Exposure to sounds of higher volume levels or longrt durations can permanently damage your hearing.• Never repair or attempt to repair a defective headset yourself. Contact your Bose Aviation Headset Department. Refer to “Contact information” on page 37• Do not immerse the headphones in water or any other liquid. See “Cleaning the headset” on page 23 for cleaning instructions.•Warning: Choking hazard, Keep the batteries away from children.• Danger of explosion if battery is incorrectly replaced. Replace only with the same type. Battery may cause a fire or chemical burn if mishandled. Do not recharge, disassemble, heat or incinerate. Dispose of used battery properly.
iiTab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15ContentsADVISORIES 1Operational advisory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Hearing safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Recognizing aircraft sounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Using audio sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Headset earcup requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Earcup inner screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3INTRODUCTION 4What’s included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4What’s in the carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Control module variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Power and cable variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7PREPARING THE HEADSET FOR USE 8The microphone assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Attaching the microphone assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8The battery compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Opening the battery compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9The operation switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Inserting and replacing the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Connecting the headset to the aircraft . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Using the 6-pin plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Using the dual general aviation plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Using other plug types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12USING THE HEADSET 13Wearing and adjusting the headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Conditions related to fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Microphone placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Clothing clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Using the control module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Power button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Power indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Auxilliary (AUX) audio input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Audio priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Using the headset with a Bluetooth® enabled phone . . . . . . . . . . . . . . . . 19Pairing the Headset with your phone . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Bluetooth® volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Making and answering calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
iiiTab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10HEADSET CARE AND MAINTENANCE 23Instructions for continued airworthiness . . . . . . . . . . . . . . . . . . . . . . . . . 23Cleaning the headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23General cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Headset earcup openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Microphone windscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Earcup inner screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Headband cushion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Replacing parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Microphone windscreen replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .24Ear cushion replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Headband cushion replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Microphone assembly or access cover replacement . . . . . . . . . . . . . . .26TROUBLESHOOTING 27In case of difficulty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27INSTALLATION 31Mounting the aircraft panel connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Details on making the connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33TECHNICAL INFORMATION 34SERVICE & WARRANTY INFORMATION 36Locating the headset serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Warranty period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Limited warranty service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36To return your headset to Bose for repair . . . . . . . . . . . . . . . . . . . . . . . .36Contact information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Ordering parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
1Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15ADVISORIESOperational advisoryThe Bose® A20™ Aviation Headset incorporates Acoustic Noise Cancelling® technology. As with any complex electronic device, it is possible for this headset to fail during operation. Symptoms of failure may include loud tones, distortion, and loss of communications signal in the headset when used in the Acoustic Noise Cancelling® mode.Note: The headset includes redundant circuitry to reduce the effects of such failures and to allow for continued use of the headset in the passive noise reducing mode.In passive noise-reducing mode, the volume controls on the control module will automatically be set to maximum volume. If additional volume control is needed, you can use the intercom or radio volume control.Acoustic Noise Cancelling® mode is active when the headset control module is powered on (power indicator is lit). The headset is in the passive mode when the power is off (power indicator is not lit). See “Control module variations” on page 6.If your headset is aircraft powered, connect the headset to the aircraft power sources only as described in “Connecting the headset to the aircraft” on page 11. The headset will not operate properly if used with any other battery source than the Bose® A20™ Aviation Headset control module.
2Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10ADVISORIESHearing safetyThe headset is intended for use with the Acoustic Noise Cancelling® mode turned on. Noise reduction and communications performance are reduced with Acoustic Noise Cancelling® mode turned off.Volume controlMake sure your aircraft communications system volume control is easily accessible. This control affects the strength of the communications signal coming into the headset.As pilot in command, you must be sure you can understand critical communications even with Acoustic Noise Cancelling® mode turned off. In this case, you may need to turn up the aircraft communications system volume.Avoid setting the volume controls at levels high enough to impair your hearing during extended periods of headset use. Recognizing aircraft soundsWith the headset’s active and passive noise reduction, typical aircraft sounds (from engines, propellers, warning alarms, and other sound sources) may not sound familiar. We strongly advise you to make sure you can hear and recognize these sounds when using the Bose® A20™ Aviation Headset while operating any aircraft.Using audio sourcesWhen listening to in-flight entertainment, or a portable audio source through a Bose® A20™ Aviation Headset, be sure to limit the volume to safe levels that do not interfere with your ability to hear informational sounds and warning alarms, such as stall warnings or gear up, while piloting.
3Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15ADVISORIESHeadset earcup requirementsProper headset operation requires that the headset TriPort® openings on the earcup are kept free of debris. The headset TriPort® openings are located on the outside of each earcup and include two holes and a screen.Earcup inner screenThe protective inner screen is critical to the headset’s ability to reduce noise.Do not attempt to remove, replace, or repair this screen. If screen replacement seems necessary, contact Bose® Technical Support. See “Contact information” on page 37.If the screen gets wet or any foreign objects become lodged on or adjacent to it, follow the instructions in “Headset Care and Maintenance” on page 23.StorageStore the headset in a ventilated area away from direct sunlight. Remove the batteries before storing the headset for extended periods.TriPort® openingMicrophone openingEarcup inner screen
4Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10INTRODUCTIONCongratulations on your purchase of a Bose® A20™ Aviation Headset. The Bose® A20™ Aviation Headset is our most advanced aviation headset yet. It delivers significantly increased noise reduction and provides a more comfortable fit, without compromising the clear audio you expect from Bose. Plus, it offers auxiliary audio input and is available with Bluetooth® mobile phone connectivity.What’s includedEach Bose® A20™ Aviation Headset is supplied with a control module, cable, and carrying case. The type of control module and end-plug configuration depends on the options you chose for your headset.There are two options for the control module:• Bluetooth® control module• Conventional control moduleThere are several end-plug configurations for the headset. Your headset falls into one of two general categories:• Dual-powered: Aircraft powered with battery• Battery-only powered
5Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15INTRODUCTIONWhat’s in the carton Note: Cable connector types will vary based on model of headset. See “Power and cable variations” on page 7.HeadphonesCarrying caseBatteries3.5 mm adapter cableHeadset assembly: Accessories:In-line clothing clipIn-line clothing clipControl moduleSee “Control module variations” on page 6 for options.Cable connector (varies)
6Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10INTRODUCTIONControl module variationsIf you opted for Bluetooth® capability, you received the Bluetooth® control module. If not, you received the conventional control module.Bluetooth® Bluetooth® Bluetooth® control module Conventional control moduleLeft/Right volume controls*Power buttonPower indicatorindicatorBluetooth® Bluetooth®function button Volume Up buttonVolume Down button*Control the intercom volumeMultifunction switch:TopIntercom prioritizedMiddleIntercom mixedBottomIntercom only Audio Priority switch:TopIntercom prioritizedMiddleIntercom mixedBottomIntercom only Auxilliary (AUX) audio input
7Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15INTRODUCTIONPower and cable variationsThe Bose® A20™ Aviation Headset is available for purchase in different standard aircraft connector options to suit pilot needs including:•Dual G/A• 6-pin install*•5-pin XLR•U174*An adapter is available from Bose to convert a 6-pin connector to a dual G/A plug for additional connection flexibility. Other configurations require the purchase of a cable assembly.
8Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10PREPARING THE HEADSET FOR USEThe microphone assemblyYour headset is shipped with the microphone assembly (boom microphone and cable) attached to the left earcup. If the microphone assembly is packed separately, you can attach it to either earcup.Attaching the microphone assemblyChoose the earcup (L or R) to receive the microphone assembly. Also, make sure that the earcup connector pins are clean and free of debris.1. Use a phillips screwdriver to loosen the two screws on the access cover near the bottom of the earcup where you want to attach the microphone assembly. 2. Remove the access cover to reveal the connector pins on the earcup.3. Carefully line up the microphone assembly to the small connector socket on the earcup.4. Slide the connector into the socket until it reaches the stop.CAUTION: Do not force the connector into the socket, or earcup damage may occur.5. Tighten the screws to secure the assembly.6. Attach the access cover to the earcup that does not have the microphone assembly attached. Insert the screws, then align and tighten them.Note: The headset will not work without the access cover installed.CAUTION: Be sure to try the headset and properly test its operation before flight.Access cover Connector pinsMicrophone assembly Connector pinsL for left
9Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15PREPARING THE HEADSET FOR USEThe battery compartmentThe Bose® A20™ Aviation Headset is shipped with factory-set operation defaults. If you want to alter these defaults, you can change the operation switches located inside the control module battery compartment. If you do not want to change any of the operation switches, skip ahead to “Inserting and replacing the batteries” on page 10.Opening the battery compartmentYou must open the battery compartment to access the operation switches. Press down firmly on the battery compartment cover finger indent and slide the cover down.The cover is tethered to the module. Do not attempt to detach it..Note: The battery compartment cover is designed to remain securely closed. You may need to use additional force when pressing down and releasing cover.The operation switchesThe operation switches control the Auto off function and whether you hear mono audio in one or both ears.To change the operation switches1. Open the battery compartment. 2. If batteries are installed, remove them.In the battery compartment, you can observe and change the switch positions. Operation switches
10Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10PREPARING THE HEADSET FOR USE3. To change a switch position, use a pen or a small, flat-tipped screwdriver to gently move the switch.The following table shows, for each switch, its possible positions, default setting, and purpose.Auto off FunctionalityThe Auto off feature detects when the headset is not in use and shuts it off after several minutes to preserve battery power. The exact time it takes to shut off varies and can range between 3 to 9 minutes after you stop using the headset.When the headset is running on battery power only and is not plugged in to an intercom, it will shut off even when there is an auxiliary input present. If you are on a phone call and unplugged from an intercom, the headset will allow you to complete your call, then it will turn off approximately three seconds after the call is terminated.Note: To use the headset when unplugged from the intercom to listen to auxiliary input audio or as a stand-alone Bluetooth® headset to make or receive calls, we recommend you disable the auto-off feature for uninterrupted functionality.Inserting and replacing the batteriesCAUTION: If the batteries do not fit correctly, do not force them in. Forcing an improper connection will cause permanent damage to the control module.To insert or replace the batteries1. Turn off headset power.2. Press down firmly on the battery compartment cover and slide the cover to release. The battery door is tethered. Do not detach the door from the control module. 3. Insert the two supplied alkaline AA batteries into the control module, observing proper polarity.4. Replace the battery compartment cover.Note: Rechargeable batteries will alter the accuracy of the battery power indicator.Switch Options Purpose1Auto off function ON, OFFDefault: ONSet at the factory to enable the Auto off function. The headset will turn off after 3 to 9 minutes of inactivity. To disable Auto off, set the switch to OFF. With the switch in OFF position, the Acoustic Noise Cancelling® system will not turn off until you press and hold the power button for at least one second.2 Mono/Stereo selection Mono, StereoDefault: MONOSet at the factory for mono audio systems (to provide audio in both ears). Set it to stereo (ST) if your aircraft has a stereo intercom.
11Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15PREPARING THE HEADSET FOR USEConnecting the headset to the aircraftThe Bose® A20™ Aviation Headset can be configured to either plug into aircraft power or rely entirely on battery power.Using the 6-pin plugA single 6-pin plug inserted into the 6-pin connector provides the headset with aircraft power and intercom audio.If your headset is aircraft powered, a 6-pin connector must be installed and mounted to an aircraft panel. See “Mounting the aircraft panel connector” on page 31.Note: An adapter is available from Bose to convert a 6-pin connector to a dual G/A plug for additional connection flexibility.To connect the headset1. Align the 6-pin plug to the connector keyway by matching the narrow bar on the plug to the slot on the connector.2. Firmly press the plug into the connector jack.To disconnect the headset1. Pull back on the sleeve near the end of the 6-pin plug.2. Gently continue pulling back to remove the plug from the connector. CAUTION: Do not pull the connector out without first pulling back the sleeve. Forcing the connector out will damage the cable and/or the aircraft instrument panel.Align keyway Push plug inPull sleeve back, then pull plug outSleeve
12Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10PREPARING THE HEADSET FOR USEUsing the dual general aviation plugsThe most common battery powered (only) version of the headset has two general aviation (GA) plugs that connect to the aircraft audio. Although the plugs look similar, the microphone plug is shorter, thinner and has a slightly different shape than the intercom plug. Insert the thicker intercom plug in first. It will only fit into one of the jacks. Then insert the thinner microphone plug into the other jack.Using other plug typesThe Bose® A20™ Aviation Headset is also available with other types of plugs for connecting to various aircraft audio jacks. These single plug connectors should be inserted into the appropriate jack on your aircraft control panel. See “Power and cable variations” on page 7.Intercom/Audio Microphone
13Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15USING THE HEADSETWearing and adjusting the headsetProper fit on your head is important both for comfort and optimal noise reduction performance. Here are a few guidelines:• Use the left (L) and right (R) markings above the earcups to orient the headset properly. • As you put the headset on, lightly grasp each earcup and adjust it so its cushion is completely over your ear. You should feel an even, gentle pressure all around each ear. • Adjust the headband so it rests gently on top of your head.Make your final adjustments with the headset powered on in a noisy environment. In very loud conditions, such as during takeoff, you may experience a brief reduction in Acoustic Noise Cancelling® as the headset compensates for a momentary pressure change. If the problem continues when the sound level returns to normal, refer to “In case of difficulty” on page 27. If the problem persists, contact Bose® Technical Support for assistance.Conditions related to fitA low rumbling sound or frequent, brief losses of Acoustic Noise Cancelling® noise reduction may indicate an improper fit or blocked earcup ports. See “Headset earcup openings” on page 23 for instructions on removing blockages.During a long flight, you may feel a slight pressure point, which can be relieved by adjusting the headband position. Your experience with using the headset will help establish a sense of how it should sound and feel.Microphone placementMicrophone placement is important for clear communications. With the headset on your head, make these adjustments:R L
14Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10USING THE HEADSET1. Grasp the boom with your fingers and move the microphone up or down so it is level with your mouth.2. Pull the microphone in toward your lips. Position the microphone with its talk side facing in. Though it will be slightly off center, the microphone should be 1/2 inch from the opening of your lips. 3. Make sure the talk side of the microphone is facing your lips. Do not purse your lips.Clothing clipsThe control module cable is fitted with two clothing clips. Use the clips to attaching the headset cable to your clothing, a safety harness, or an aircraft door pocket. Mic is 1/2 inch from mouthMic is too far awayMic label is not facing mouthMic labelPress to open clipPress to release and reposition clip along the cable
15Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15USING THE HEADSETUsing the control moduleUse the control module to control the headset functions. There are two variations of the module; one that works with Bluetooth® and one that has basic functions only.Bluetooth® Bluetooth® Bluetooth® control module Conventional control moduleLeft/Right volume controls*Power buttonPower indicatorindicatorBluetooth® Bluetooth®Auxilliary (AUX) function button Volume Up buttonVolume Down button*Control the intercom volumeMultifunction switch:TopIntercom prioritizedMiddleIntercom mixedBottomIntercom only Audio Priority switch:TopIntercom prioritizedMiddleIntercom mixedBottomIntercom only audio input
16Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10USING THE HEADSETPower buttonUse the power button to turn Acoustic Noise Cancelling® on or off, and control indicator brightness.• Press the power button once to turn on Acoustic Noise Cancelling® noise reduction.• Press and hold the power button to turn off Acoustic Noise Cancelling® noise reduction. • Double click the power button to dim the power and Bluetooth® indicators. To toggle the indicators between dim and bright, rapidly press the power button twice.Volume controlThe left and right volume control wheels on the control module adjust the volume of the corresponding earcup. With Acoustic Noise Cancelling® off, volume control will be set to the maximum level.CAUTION: Avoid setting the volume levels too high. Exposure to loud sounds may cause hearing damage.Holding the control module upright and facing you:• Use the left wheel to adjust volume of the left earcup. • Use the right wheel to adjust volume of the right earcup. Overall headset volume control requires adjustments at both the aircraft intercom or radio and at the headset control module. Even at its lowest setting, neither volume control wheel can completely turn off the volume.Power indicatorNew alkaline AA batteries will generally supply at least 40 hours of power for the headset. Battery life varies with the ambient noise level of the aircraft, temperature, ear cushion condition, and age of the batteries. The power indicator changes color to indicate the power status, as follows: * Bluetooth® is disabled to conserve the remaining power once the battery reaches this level.Indicator Color Power source Type of light IndicatesGreen Aircraft Slow flashing Power ONGreen Battery Flashing Power ON and batteries goodAmber Battery Fast flashing Power ON, but batteries low (8 hours or less remaining)Red Battery Faster flashing Power ON, but batteries very low* (2 hours or less remaining) Off None None Power OFF or batteries depleated
17Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15USING THE HEADSETAuxilliary (AUX) audio inputThe Bose® A20™ Aviation Headset provides a 1/8 inch (3.5 mm) AUX audio input that allows you to use your headset with an external audio source such as a portable GPS or a portable audio device. The connector is located at the bottom end of the control module as shown. Your headset includes a 1/8 inch (3.5 mm) adapter cable to connect your external audio device. Plug one end of the adapter cable to the headphone plug on your device and the opposite end to the headset AUX audio input.Note: None of the functions of a connected audio source are controlled by the control module. Note: This feature will not work unless the multifunction switch is turned on.Note: When the headset is running on battery power only and it is not plugged in to an intercom, it will shut off even when there is an auxiliary audio input present. To use the headset when unplugged from the intercom to listen to auxiliary input audio or as a stand-alone Bluetooth® headset to make or receive calls, we recommend you disable the auto-off feature for uninterrupted functionality.Audio priorityThe Bose® A20™ Aviation Headset allows you to decide the priority of the audio sources you want to hear while using the headset. On the Bluetooth® control module the audio priority is controlled by the multifunction switch. On the conventional control module the audio priority is controlled by the audio priority switch.AUX audioinput
18Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10USING THE HEADSETMultifunction/Audio priority switchThe multifunction/audio priority switch has three positions: Note: On the Bluetooth® control module, when a Bluetooth® call is present, the audio from the call takes over the signal on the AUX audio input. Regardless of the position of the multifunction switch, both the intercom and the Bluetooth® signal are heard as mixed. Position Function OperationTop Intercom prioritized over AUX When the switch is in the top position and an intercom signal is detected, AUX audio is muted.Middle Intercom mixed with AUX When the switch is in the middle position and an intercom signal is detected, AUX audio is mixed with the intercom audio.Bottom Intercom only When the switch is in the bottom position, only intercom audio is active.
19Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15USING THE HEADSETUsing the headset with a Bluetooth® enabled phonePairing the Headset with your phoneBefore you use your Bose® A20™ Aviation Headset with your mobile phone, you must pair the two devices. This entails putting the Bose® A20™ Aviation Headset in pairing mode, setting your Bluetooth® phone to “discover” the headset, then confirming the connection on the phone.1. Make sure the headset is powered on, and that the multifunction switch is in the top or middle position, but NOT in the bottom (intercom only) position.2. Press the Bluetooth® function button to activate Bluetooth®.3. To put the headset in pairing mode, press and hold the Bluetooth® function button on the control module for at least five seconds.The headset emits a long, low pitched beep when it enters pairing mode and the Bluetooth® indicator glows.4. Set your Bluetooth® phone to “discover” the Bose® A20™ Aviation Headset.You phone’s instruction guide will give you the necessary directions. This usually involves going to a “setup,” “connect,” or “Bluetooth®” menu on your phone and selecting the option to “discover” or “add” a Bluetooth® device.Your phone will find the Bose® A20™ Aviation Headset. Your phone then asks if you want to pair with the headset. The device name “BOSE A20” will appear on the phone .5. On the phone, accept by pressing “Yes” or “OK” and confirm with the passkey or PIN of 0000 (four zeros). Your phone indicates when pairing is complete: the Bluetooth® indicator and power indicator on the control module flash in synchronization with each other. If pairing is unsuccessful, repeat steps 1 to 3.Multifunction Switch in top or mid positionPower On(indicator lit)
20Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10USING THE HEADSETNote: The Bose® A20™ Aviation Headset will automatically exit pairing mode after five minutes of inactivity.Bluetooth® status indicatorThe Bluetooth® status indicator is a blue LED on the control module that indicates the status of the Bluetooth® function, as follows: Reconnecting to a previously connected deviceTo reconnect the headset to a previously connected phone or other Bluetooth® device, briefly press the Bluetooth® function button on the headset control module.The headset control module attempts to connect with the last connected Bluetooth® device. Note: The Bose® A20™ Aviation Headset can only be connected to one Bluetooth® device at a time. If you press the Bluetooth® function button on the headset control module for more than five seconds, the currently connected Bluetooth® device is disconnected and the control module enters pairing mode.Recovering a lost connectionWhen a connected Bluetooth® device moves out of range and the connection is lost, the Bose® A20™ Aviation Headset automatically attempts to reconnect. If a connection still does not exist after five minutes, the Bluetooth® receiver in the control module remains on, but not connected. The Bluetooth® indicator on the Bose® A20™ Aviation Headset control module alternately flashes on when the power indicator flashes off.Disconnecting the Bluetooth® deviceIf you use a connected phone to end a Bluetooth® connection, the Bluetooth® receiver in the headset control module remains on, but no longer attempts to connect. A Bluetooth® connection is ended by turning the phone off, ending the current call, or discontinuing the wireless connection.If you turn the headset control module Off, the control module Bluetooth® receiver also turns off, ending the connection to the Bluetooth® phone.Type of light IndicatesConstant ON Discoverable or pairingFlash pattern: ON when the power indicator is OFF Power on and not connected to phoneFlash pattern: ON when the power indicator is ON Power on and connected to phoneOFF Bluetooth not enabled
21Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15USING THE HEADSETBluetooth® volume controlThe Bluetooth® volume control increases or decreases the volume of the mobile phone that is paired to the Bose® A20™ Aviation Headset. The Bluetooth® volume control is located on the right side of the control module. You can only adjust Bluetooth® volume during an active phone call. To change the volume, press the volume up or volume down button. Each time you press a Bluetooth® volume button, the volume increases or decreases one level.Note: Pressing and holding the volume button does not cause the volume to change by more than one level.Note: When Bluetooth® is active, you cannot mute the sound using the Bluetooth® volume buttons.volume down volume up
22Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10USING THE HEADSETMaking and answering calls To make a callDial from your mobile phone, and the call will automatically transfer to the headset. If your phone has voice activated dialing, press the Bluetooth® function button and wait for the phone voice prompts. To activate voice dialingWhen there are no active or incoming calls, briefly press the Bluetooth® function button. To answer a callBriefly press the Bluetooth® function button. You should hear a short beep in the headphones before you hear the incoming call. To end a callBriefly press the Bluetooth® function button. You should hear two short beeps in the headphones to indicate that the call has been ended. To reject an incoming callPress the Bluetooth® function button for three seconds. Note: To avoid putting the control module into pairing mode, do not press the Bluetooth® function button for more than five seconds.To redial the last numberWhen there are no active or incoming calls, press the Bluetooth® function button twice in quick succession.Note: Whether or not you can reject an incoming call, activate voice dialing, or redial the last number depends on the capabilities of your phone. Please check your phone user guide for further details.To transfer the audio to the mobile phoneWhen you are on a call, press the Bluetooth® function button for three to four seconds. This transfers the audio to the mobile phone handset while the Bluetooth® connection remains active.Note: If you are on a call and unplugged from an intercom, the headset will allow you to complete your call, then it will turn off approximately three seconds after the call is terminated. To use the headset when unplugged from the intercom to listen to auxiliary input audio or as a stand-alone Bluetooth® headset to make or receive calls, we recommend you disable the auto-off feature for uninterrupted function-ality.
23Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15HEADSET CARE AND MAINTENANCEInstructions for continued airworthinessBose® recommends following the general care and maintenance instructions in this guide. With normal use, items such as windscreens and ear cushions may require periodic replacement. If cleaning or replacement of these items is needed, follow the recommendations on the following pages. All other care and maintenance, in and out of the warranty period, must be performed by Bose® or an authorized repair facility.CAUTION: Do not immerse the headset in water or any other liquid. If the headset is immersed in liquid, do not use it. Contact the Bose® Technical Support for assistance.Cleaning the headsetGeneral cleaningGently wipe the outside surfaces of the headband, connectors, plastic parts, and headband cushion, using a soft cloth moistened with water and mild soap. Take special care when cleaning the ear cushions and the outside surfaces of the earcups. Do not immerse ear cushions in water or any other liquid.Headset earcup openingsThe headset TriPort® opening and the microphone opening must remain clean and free of debris. Check to ensure that the openings on each earcup are clean before each flight.When wiping down the headset earcups, be sure not to force any dirt or debris into the openings. Carefully use tweezers, if necessary, to remove foreign matter that may be lodged in the openings. Do not blow air into or vacuum the openings as this may damage the headset.Microphone openingHeadset TriPort® opening
24Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10HEADSET CARE AND MAINTENANCEMicrophone windscreenRemove the windscreen from the microphone as described in “Microphone windscreen replacement” on page 24. Rinse and air-dry the windscreen. Make sure the windscreen is completely dry, then reattach.Earcup inner screenDo not attempt to remove, replace, repair, or clean this component. Located inside the earcup, the inner screen is critical to proper headset operation. If the screen appears to be damaged or worn out, contact Bose®. If the inner screen becomes damp, due to environmental moisture such as light rain, dew, perspiration, or condensation, allow it to air dry only. Do not use electric heaters, blowers, or hairdryer type devices to dry the inner screen. Headband cushion1. Remove the cushion as described in “Headband cushion replacement” on page 26.2. Place the cushion in a solution of water and a mild detergent.3. Allow the cushion to air dry, then, reattach. Replacing partsThrough normal use, parts like windscreens and ear cushions may require periodic replacement. Replacement parts can be ordered directly from Bose® Corporation. Please refer to “Contact information” on page 37.Microphone windscreen replacement1. Roll the band that secures the windscreen off the tip of the microphone and dispose of it. 2. Gently slide the windscreen off the microphone.3. Slide the replacement windscreen on and make sure that it fits completely over the microphone.4. Roll the new band onto the microphone tip, to about 1/4 inch from the end of the windscreen, to secure it.
25Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15HEADSET CARE AND MAINTENANCEEar cushion replacementAs a general rule, ear cushions should be replaced every six months or every 350 hours of use, depending on how often you fly. You may have to replace them more often, if you:• Have a full beard or heavy whiskers• Subject the headsets to severe temperature extremes such as parking your airplane outside in severe cold or heat • Put excess strain on the cushions because of improper storage.Indications that the ear cushions need replacing include:• Flaking of the outer covering• Cuts or tears• Flattening of the cushion, reducing the effectiveness of the seal.To extend the life of the ear cushions, perform regular cleaning as described in “General cleaning” on page 23.Replacing the ear cushions1. Grasp the ear cushion skirt where it folds into the slot on the earcup.2. Gently pull the ear cushion skirt up and away from the earcup.3. Properly align the replacement ear cushion with the earcup. 4. Tuck an edge of the ear cushion skirt into the slot behind the ear cushion flange. Be careful not to fold the skirt over.5. Work the remainder of the skirt into the slot completely around the earcup.6. Grasp the ear cushion and adjust its position to remove any folds in the skirt and wrinkles in the cushion.Battery replacementSee “Inserting and replacing the batteries” on page 10.
26Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10HEADSET CARE AND MAINTENANCEHeadband cushion replacementThe headband cushion is designed to give the maximum level of comfort to your headset. Bose recommends that you replace the cushion after regular care and maintenance fails to restore the wool pile to its original size and shape.To replace the cushion: 1. On a protected surface, turn the headset upside down. Remove the old cushion from the headband.2. While still holding the headband open, align the center of the new cushion with the center of the headband and press firmly from the center toward the outside. Microphone assembly or access cover replacementReplace the microphone assembly or connector access cover as described in “Attaching the microphone assembly” on page 8.Headband cushion
27Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15TROUBLESHOOTINGIn case of difficultyLook for the problem in the left column of the table, then follow the “What to do” instructions in the right column. If the problem persists, contact Bose, using the contact information on page 37 of this guide for assistance.CAUTION: Do not attempt to disassemble or service the inside of the earcups or other parts of the headset. Only the boom microphone cable, access cover, bat-teries, windscreen, headband cushion, and ear cushions are replaceable by the user. For instructions on how to care for and maintain the headset, see “Headset Care and Maintenance” on page 23. Noise ReductionCommunicationsProblem What to doCommunication, but no Acoustic Noise Cancelling® in either ear• Make sure the headset is powered on. The headset will not turn on automatically when connected to the aircraft. Press the power on button to turn the headset on.• Check the power indicator. See page 16 for a description of the power indicator. • If using aircraft power, check the aircraft fuse or circuit breaker .• If using battery power, make sure that the batteries are fresh and correctly installed.No active Acoustic Noise Cancelling® noise reduction and no communication• Make sure the headphone jacks are securely inserted in the panel.• Try using the headset in a different seat location• Remove cable assembly from the headset and check for damage to connector or pins.Problem What to doAcoustic Noise Cancelling® noise reduction, but no incoming audio• Check to see if the volume controls are set too low. See “Volume control” on page 16 for instructions on volume adjustment.• Check the volume setting of intercom/radio. • Make sure the headphone jacks are securely inserted in the panel.
28Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10TROUBLESHOOTINGAudioProblem What to doLow volume of incoming communications• Check to see if the volume controls are set too low. See “Volume control” on page 16 for instructions on volume adjustment.• Ensure that the stereo/mono switch is correctly set for your intercom system.• Check that all headsets sharing the intercom have the stereo/mono switch in the correct position.• Unplug all other headsets and see if the volume can be adjusted to an acceptable level.Intermittent communication • Check that the connection to the aircraft panel is not loose.• Try the headset in a different seat location.Reduced volume in one ear only • Check to see if the volume control is set too low. See “Volume control” on page 16 for instructions on volume adjustment. • Check the stereo/mono configuration switch. See “The operation switches” on page 9.No stereo separation, or communications in one ear only• If your aircraft has a mono audio system, verify that the stereo/mono configuration switch is set to mono. See “The oper-ation switches” on page 9. Depending on how your audio jacks are wired, there may be only one channel of audio supplied to the headphone jack. If the stereo/mono switch is set to stereo and you only hear communications on one side, setting the switch to Mono plays audio on both sides.Problem What to doReduced Acoustic Noise Cancelling® noise reduction, intermittent clicking sounds, or communication distortion in a loud environment• Check the TriPort® headset openings on the outside of each earcup to ensure they are not blocked. If dust or dirt is present, carefully remove the debris using tweezers. Do not vacuum or blow out debris.• Make sure there are no air gaps around the ear cushion seals. If ear cushions appear worn they should be replaced. See “Ear cushion replacement” on page 25.Squealing or whistling sound when the headset is turned on • Ensure the headset orientation is correct. Use the Left (L) and Right (R) markings above the earcups to orient the headset cor-rectly.• Inspect the seal between the ear cushion skirt and the earcup. The skirt should fit into the slot on the earcup with no gaps. Replace any cushions that appear to be worn out.• Adjust the earcup fit to create a better seal on your head. The headset’s low-force design makes it sensitive to items that inter-fere with the seal around your ear. Make sure that your ears are completely inside the ear cushions, and that a hat or eyeglasses with thick temples do not interfere with the seal.
29Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15TROUBLESHOOTINGAuxiliary audio inputProblem What to doLow rumbling sound with the headset turned on in a quiet environment• Adjust the earcup fit to create a better seal on your head. The low-force design of the headset makes it sensitive to items that interfere with the seal around your ear. Make sure that your ears are completely inside the ear cushions, and that a hat or eyeglasses with thick temples do not interfere with the seal. • Check ports at the outside surface of each earcup to ensure they are not blocked. If dust or dirt is present, carefully remove the debris using tweezers. Do not blow out or vacuum debris.• Inspect the seal between the ear cushion skirt and the earcup. The skirt should fit into the slot on the earcup with no gaps. Replace any cushions that appear to be worn out.Crackling sound audible with headset turned on in a loud environment, or Acoustic Noise Cancelling® noise reduction is intermittent• Ensure the headset orientation is correct. Use the Left (L) and Right (R) markings above the earcups to orient the headset correctly.• Adjust the earcup fit. See “Wearing and adjusting the headset” on page 13.• If your headset is battery powered, check to see if the battery is low (indicated by fast blinking red LED).• If your headset is aircraft powered, make sure that the voltage powering the headset is no less than 10 VDC. • Inspect the seal between the ear cushion skirt and the earcup. The skirt should fit into the slot on the earcup with no gaps. Replace any cushions that have surface tears, torn stitching joints, large wrinkles, or have become dried and stiff.Problem What to doNo audio from auxiliary source • Use a different headset with the source you want to hear to isolate the issue to the headset.• Turn source volume up.• Make sure multifunction switch is not set to the bottom (intercom only) position. The multifunction switch must be either in the top or middle position for audio from an auxiliary input to be enabled.• Check the connection between the auxiliary source and the control module. Both ends of the AUX IN connector cable must be properly seated inside the sockets.• If the multifunction switch is set to the prioritized position (top) the auxiliary audio source will not be heard if there is an audio signal from the intercom.Audio in one ear only from the auxiliary input • Check the connection between the auxiliary source and the module. Both ends of the AUX IN connector cable must be properly seated inside the sockets.• Make sure the earcup cover on the headset is in place and properly connected. See “Attaching the microphone assembly” on page 8.
30Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10TROUBLESHOOTINGBluetoothAuto offProblem What to doCannot hear communications while listening to audio from aux input or aux input does not mute with incoming communications• Check headset prioritization settings. See “Multifunction/Audio priority switch” on page 18.• Make sure all connections are secure (headset to intercom, aux input to headset).• Communications audio is not present unless the headset is con-nected to an intercom system.Problem What to doNo audio to the headset while on a call• Check to make sure the headset and phone are paired, the multi-function switch is in the top or middle position, and the devices are communicating with each other.• Make sure the phone and headset are in Bluetooth® range (no more than 30 feet from each other).• Make sure the Bluetooth® volume is turned up on the control module.The headset is not pairing with my phone• Follow your phone instructions to remove all devices previously paired with your phone.• Repeat the steps for pairing the headset with your phone. See “Pairing the Headset with your phone” on page 19.I cannot answer/end a call • Make sure your phone is properly paired and connected to the headset. See “Making and answering calls” on page 22.The headset does not reconnect to my phone when I turn it on• Make sure the phone has Bluetooth enabled. • Turn the multifunction switch on to the top or middle positions.• Press the Bluetooth function button.Problem What to doHeadset does not shut off automatically• In the battery compartment, make sure Switch #1 is set to ON (default).• See “The operation switches” on page 9 for details on Auto off functionality.• It may take up to nine (9) minutes for the headset to shut off when not in use immediately after initial power up.
31Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15INSTALLATIONMounting the aircraft panel connectorThe aircraft panel connector is part of the optional 6-pin wiring harness assembly. Contact Bose® Technical Support, using the contact information on page 37 of this guide, for purchase information.CAUTION: The aircraft panel connector must be mounted by a technician who is qualified to perform this type of avionics installation for the aircraft you are using.Mount the connector into a cutout, using the diagrams below as a guide. Connect the eight wires as follows: • Two for the microphone• Two for audio•One for power• One for ground• Two for audio shieldsAudio and microphone wires should be connected to the back of the existing microphone and headphone jacks, leaving existing jacks intact for use with conventional headsets. This is usually the fastest installation method.RED•1 V+INBLK•2 GNDWHT•3 COMM LBLU•4 COMM RWHT•5 MIC HIWH/BLU•6 MIC LOBLK/WHBLK/WH12.5mm.49".55"14.0mmPin 6Pin 1AIRCRAFT INTERFACE SCHEMATICRECEPTACLE - PINOUT (FRONT VIEW)
32Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10INSTALLATIONCAUTION: Do not use excessive force or bend the installed connector. This may damage or break internal solder joints.Note: The aircraft panel connector cannot be installed to an audio system using transformer-coupled audio outputs. Contact the Bose® Technical Support, using the contact information on page 37 of this guide, for details. Mono connection diagramStereo connection diagram10-32V DC 1/2A 1V+IN2 GND3 COMM L4 COMM R5 MIC HI6 MIC LOREDBLKWHTBLUWHTWHT/BLUBLK/WHBLK/WHRing(audio)Exisiting PTTswitchand wiring(no connection toBose headset)Microphone - JackTPP(PTT) Barrel(gnd)Headphone - JackBarrel(audio gnd)Tip(phone audio)Existing wiring toaircraft intercom/audio panelExisting wiring to aircraft stereointercom/audio panel10-32V DC 1/2A 1V+IN2 GND3 COMM L4 COMM R5 MIC HI6 MIC LOREDBLKWHTBLUWHTWHT/BLUBLK/WHBLK/WHAudioExisiting PTT switchand wiring(no connection toBose headset)Microphone - JackTPP(PTT)Barrel(gnd)Stereo Headphone - JackBarrel(audio gnd)Tip(phone audio left)Phone audio (right)
33Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15INSTALLATIONHelicopter connection diagramNote: Barrel ground (gnd) refers to aircraft grounds.Details on making the connectionsThe pinouts for the optional installed connector are detailed in the table below:Pin number Color Purpose1 Red V+IN: Headset power (10-32 VDC). Use a 1/4 amp fuse or a 1/2 amp circuit breaker. 2 Black GND: System ground. Connect to the existing audio ground.3 White COMM L: Phone communication: Left.4BlueCOMM R: Phone communication: Right.Note: For stereo operation, connect the left and right channels to their respective positions. For monaural operation, connect pins 3 and 4 together, and to the tip of the existing phone jack.5 White MIC HI: Microphone/Hi-audio. Connect to the portion of the existing microphone jack that corresponds to the ring position of a headset microphone plug. Do not connect to the tip (PTT) segment.6White/Blue MIC LO: Microphone/Lo-ground. Connect to the portion of the microphone jack that corresponds to the barrel position of a headset microphone plug.Note: If the microphone works on radio transmit but not through the intercom, check pin 6. It may be incorrectly wired to the PTT segment of the microphone jack.Comm Shield Black Shield from Comm L and Comm R wire pair.Mic Shield Black Shield from Mic Hi and Mic Lo wire pair.Note: The wires connecting pins 3 and 4 and pins 5 and 6 are shielded, twisted pairs with a black wire shield termination exiting each pair. If the existing wiring is not shielded, connect the shields to the existing audio wiring shields, or connect the shield from Comm L and Comm R wire pair to audio ground.Barrel(audio gnd)Existing single 4-prong jackExisting wiring tohelicopter intercom/audio panel10-32V DC6 MIC LO 5 MIC HI4 COMM R3 COMM L2 GND1 V+IN1/2AWHT/BLUWHTBLUWHTBLKRED
34Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10TECHNICAL INFORMATIONHeadphone Damage could occur to avionics equipment that is intended for use only with 600-ohm headsets. If in doubt, consult the avionics equipment manufacturer.Impedance Monaural mode: 160 Ohms ON and OFFStereo mode: 320 Ohms ON and OFFFrequency response 15 Hz to 15 kHzSensitivity: 92 dB SPL typical, measured at 1 mw, 1 kHz, full volume on a KEMAR ear simulator.Microphone (Electret) Bias required: 8 to 16 VDC through 220 to 2200 ohms.Sensitivity: Varies depending upon bias and AC radio input impedance. Typical output is 600 mV at 114 dB SPL. To assure proper modulation of the radio, it is recommended that an avionics technician adjust its input to match the output of the microphone. Microphone (Dynamic) Impedance: 5 OhmsSensitivity: Equivalent to M-87/M-101Maximum ambient noise level 115 dBC SPL for full active noise reduction performancePower source Battery powered: 2 AA alkalineAircraft powered: 10 to 32 VDCVoltage Battery powered: Two(2) AA alkaline batteriesAircraft powered: 10 to 32 VDCBattery life Alkaline battery life: At least 40 hours in typical general aviation aircraft noise. Duration varies with battery age, ambient noise levels, temperature and ear cushion seal.Current Operating: 25 mA in typical aircraft noiseFuse/breaker recommended1/4 amp, fast-blow fuse (AGC 1/4 amp fuse) or 1/2 amp circuit breakerHeadset weight 12 ouncesHeadset size range Breadth: 4.8 to 6.3 inchesHeight: 4.5 to 5.7 inchesTemperature and Altitude (Category A) Operating: 5 to 131°F (-15 to 55°C)Storage: -67 to 158°F (-55 to 70°C)Altitude: 15,000 feet maximum pressure altitude for full cancellation Bluetooth®Handsfree profile, Bluetooth® 2.1
35Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15TECHNICAL INFORMATIONFAA Technical Standards OrderThe Bose® A20™ Aviation Headset, its interface, cables, and electret microphone, are FAA approved to TSO C139. It has been designed to function in, or withstand exposure to the following environmental conditions:Environmental categories cited refer to RTCA/DO-160F and RTCA/DO-214 (March 2, 1993)Condition CategoryAltitude and Temperature A1Salt Fog SAF Conducted Susceptibility BHumidity BMagnetic effect ZPower input BRF susceptibility TTemperature and Altitude A1Vibration S, R, and UVoltage spike AShock drop 12 times, 1m onto concrete
36Tab 3, 11Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12 EnglishTab2, 10SERVICE & WARRANTY INFORMATIONLocating the headset serial numberYour Bose® A20™ Aviation Headset is identified by a unique headset serial number located on the underside of the headband and underneath the headband cushion. Reference this serial number when you register your product or contact Bose for technical support. Be sure to properly reseat the headband cushion by pressing down firmly. For more information on replacing the headband cushion, see “Headband cushion replacement” on page 26. Warranty periodLimited 5-year warranty: Bose Corporation warrants this headset to be free from defects in materials and workmanship for a period of five years from the date of purchase. Ear cushion life will vary with use. Ear cushions carry a six-month limited warranty against manufacturer’s defects.Limited warranty serviceTo return your headset to Bose for repairReturn your headset using the following procedures:1. Contact the Bose organization in your country/region (visit Global.Bose.com/register for Bose contact information in your country/region) for specific return and shipping instructions;2. Label and ship the product, freight prepaid, to the address provided by the Bose organization in your country; and3. Place any necessary return authorization number prominently on the out-side of the carton. Cartons not bearing a return authorization number, where required, will be refused.Serial numberHeadband cushion
37Tab 6, 14English Tab 2, 10 Tab 3, 11 Tab 4, 12 Tab 5, 13 Tab 8, 16Tab 7, 15SERVICE & WARRANTY INFORMATIONContact informationContact Bose for:• Spare parts and accessories• Technical advice• Installation information• Warranty and repair information.In North America:Bose® Technical Support145 Pennsylvania AvenueFramingham, MA 01701-9168 USATEL: 1-800-233-4416 (US); 508-879-7330, ext. 62006 (outside US)FAX: 1-508-766-5997E-MAIL: aviationheadsetsupport@Bose.comIn Europe:Noise Reduction Technology GroupNijverheidstraat 8 NL-1135 GE Edam TEL: +31(0)299-390150 FAX: +31(0)299-390109E-MAIL: aviation_europe@Bose.comWorld Wide Web: www.Bose.comOrdering parts and accessoriesThe following accessories and customer-replaceable parts can be purchased directly from Bose. See the contact information above.• Additional control module cableSpecify: Bluetooth® or conventional moduleSpecify: connector type (dual G/A, 6-pin, etc.)• Ear cushion kit•Carrying case• Headband cushion kit• Windscreen with attachment band• Aircraft panel connector installation kit• Clothing clip• Earcup access cover• Install kit cover plate• Service kit, includes:- Ear cushion kit- Microphone windscreen with attachment band- Headband cushion kit
A20™ AVIATION HEADSETOwner’s Guide©2010 Bose Corporation, The Mountain,Framingham, MA 01701-9168 USAAM325664 Rev.00

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