Bose A20 Aviation 2015-present Owner's guide - Page 31

Troubleshooting Problem What to do Low volume of incoming ­communications • On the control module, make sure the volume controls are not set too low. See "Intercom volume controls" on page 18. • On the intercom/radio, make sure the volume controls are not set too low. • Inside the battery compartment, make sure the Intercom ­(MON-ST) switch is ­correctly set for your intercom system. See "The operation switches" on page 11-12. • Check that all headsets sharing the intercom have the Intercom (MON-ST) switch in the correct position. • Unplug all other headsets and see if the volume can be adjusted to an acceptable level. Intermittent ­communication • Make sure the headset is firmly connected to the aircraft panel. • Try the headset in a different seat location. Reduced volume in one ear only • On the control module, make sure the volume controls are not set too low. See "Intercom volume controls" on page 18. • Inside the battery compartment, make sure the Intercom ­(MON-ST) switch is ­correctly set for your intercom system. See "The operation switches" on page 11-12. No stereo separation or communications in one ear only • If your aircraft has a mono audio system, verify that the ­Intercom (MON-ST) switch is set to MON. Refer to "The operation switches" on page 11-12. • Depending on how your audio jacks are wired, there may be only one channel of audio supplied to the headphone jack. If the ­Intercom (MON-ST) switch is set to ST and you only hear communications on one side, set the switch to MON. This will play audio on both sides. U174 and 5-pin XLR plugs are mono audio only. Audio Problem Reduced Acoustic Noise Cancelling® noise reduction, intermittent clicking sounds, or communication distortion in a loud environment What to do • On the outside of each earcup, make sure the TriPort® headset openings 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. Refer to "Ear cushion replacement" on page 28. Warning: If the headset emits any loud noise and ­related loss of communications while in the Acoustic Noise ­Cancelling mode, turn off the power switch. The headset will continue to provide communications in the passive noise reducing mode. English - 31