Bose A20 manual Auxiliary audio input, Problem, What to do, Troubleshooting

	TROUBLESHOOTING
Problem	What to do
Low rumbling	• Adjust the earcup fit to create a better seal on your head. The
sound with the	low-force design of the headset makes it sensitive to items that
headset turned on	interfere with the seal around your ear. Make sure your ears are
in a quiet	completely inside the ear cushions, and that a hat or eyeglasses
environment.
	with thick temples do not interfere with the seal.
	• Check ports at the outside surface of each earcup to ensure that
	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	• Ensure the headset orientation is correct. Use the Left (L) and
audible with	Right (R) markings above the earcups to orient the headset
headset turned on	correctly.
in a loud	• Adjust the earcup fit. Refer to “Wearing and adjusting the head-
environment, or
	set” on page 13.
Acoustic Noise
Cancelling® noise	• If your headset is battery-powered, check to see if the battery is
reduction is	low (indicated by fast blinking red LED).
intermittent.	• If your headset is aircraft powered, make sure 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.
Auxiliary audio input
Problem	What to do
No audio from	• Turn source volume up.
auxiliary source.	• Try another source with the headset to eliminate the source as
	the possible problem.
	• 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	• Check the connection between the auxiliary source and the
only from the	module. Both ends of the AUX IN connector cable must be
auxiliary input.	properly seated inside the sockets.
	• Make sure the earcup cover on the headset is in place and
	properly connected. Refer to “Attaching the microphone
	assembly” on page 8.

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