Bose II manual In Case of Difficulty, Problem, What to do

In Case of Difficulty

Problem	What to do
Communication but no	• Make sure that your headset is powered, and that the power switch is “ON.”
active noise reduction in	• If using DC power from the aircraft, check the aircraft fuse or breaker.
both ears.
	• If using the NICAD battery pack, verify that it is charged.
	• If using the alkaline battery pack, verify that:
	–	batteries are installed with the correct polarity. The negative terminal of
		each battery attaches to the springs in the battery holder (refer to step 4
		on page 13).
	–	batteries are fully seated and in contact with the top and bottom contacts
		of the battery holder. If necessary, spin the installed batteries once with
		your thumbs to fully seat them (refer to step 5 on page 13).
	–	batteries are fresh.
	–	the headset plug is fully seated in battery pack (refer to step 11 on page 14).
Active noise reduction	Check to see if the volume controls are turned too low (rotate up to increase
but no (or very low	the volume).
volume) communication
in both ears.
Reduced active noise	Check the holes at the bottom of each earcup to make sure they are not blocked.
reduction, intermittent	If dust or dirt has built up here, carefully use a small wire or the end of a bent
clicking sounds, or	paper clip to unclog the hole. You may need to remove the microphone to clean
communication distortion	the holes.
in a loud environment.
Low rumbling sound with	• Adjust the earcup fit to create a better seal to your head. Be sure that a hat
the headset turned on in	or eyeglasses do not interfere with the seal.
a quiet environment.	• Inspect the seal between the cushion and the earcup. The cushion should
	sit on the earcup evenly, without gaps.
	• Check the holes at the bottom of each earcup to make sure they are not
	blocked. If dust or dirt has built up here, carefully use a small wire or the end
	of a paper clip to unclog the hole. You may need to remove the microphone
	to clean the holes.
Popping sound audible	• Adjust the earcup fit to eliminate the sound.
with headset turned on	• Inspect the seal between the cushion and the earcup. The cushion should
in a loud environment.	sit on the earcup evenly, without gaps.
Squealing, whistling, or	Check to see if the ear cavity foam liner is missing or severely damaged. If so,
chirping sound when the	refer to “Care and Maintenance” (page 18).
system is turned on.
	Do not attempt to disassemble or service the inside of the earcups or other parts
	of the headset. Only the microphone boom assembly, Clear ComfortTM cushions,
	trim rings, foam liners, headband cover, and foam pad are designed for replace-
	ment by the user. For instructions on how to care for your headset and how to
	replace the cushions, refer to “Care and Maintenance” (page 18). If problems
	persist, contact the Bose® Aviation Headset Service Department (page 23).

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