Bose X manual Low rumbling sound with

TROUBLESHOOTING

Stereo missing or communi- • If your aircraft has a mono audio system, verify that the stereo/

cations in one ear only mono configuration switch is set to mono. See “Changing the optional operation switches” on page 13. If the switch is set to stereo, and the headset is plugged into a mono audio system, you will hear only through the left earcup.

Squealing, whistling, or chirping sound when the system is turned on

• Check to see if the protective inner screen is damaged.

Low rumbling sound with	• Adjust the earcup fit to create a better seal on your head. The
headset turned on in a quiet	headset’s low-force design makes it sensitive to items that
environment	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 enclose the earcup evenly, without gaps.
	Replace any cushions that have surface tears, torn stitching
	joints, large wrinkles, or have become dried and stiff.
Crackling sound audible with	• Adjust the earcup fit to eliminate the crackling sound. Refer to
headset turned on in a loud	“Wearing it properly” on page 19.
environment, or ANR is inter-	• If your headset is battery powered, check to see if the battery is
mittent	low (indicated by fast blinking red LED).
	• If your headset is aircraft powered, make sure that the voltage
	powering the headset is greater 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.
No active noise reduction	• Check boom microphone cable connection on the bottom of
and no communication	the earcup.

CAUTION: Do not attempt to disassemble or service the inside of the earcups or other parts of the headset. Only the boom microphone cable, connector access cover, batteries, battery cover, windscreen, and ear cushions are replaceable by the user. For instructions on how to care for the headset and how to replace the ear cushions, refer to “Headset Care and Maintenance” on page 25.

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