Bedienungsanleitung Bose Aviation Headset Series II (Seite 20 von 28) (Englisch)

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Communication but no

active noise reduction in

both ears.

Problem What to do

In Case of Difficulty

• Make sure that your headset is powered, and that the power switch is “ON.”

• If using DC power from the aircraft, check the aircraft fuse or breaker.

• 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).

Check to see if the volume controls are turned too low (rotate up to increase

the volume).

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 bent

paper clip to unclog the hole. You may need to remove the microphone to clean

the holes.

• Adjust the earcup fit to create a better seal to your head. Be sure that a hat

or eyeglasses do not interfere with the seal.

• 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.

• Adjust the earcup fit to eliminate the sound.

• Inspect the seal between the cushion and the earcup. The cushion should

sit on the earcup evenly, without gaps.

Check to see if the ear cavity foam liner is missing or severely damaged. If so,

refer to “Care and Maintenance” (page 18).

Active noise reduction

but no (or very low

volume) communication

in both ears.

Reduced active noise

reduction, intermittent

clicking sounds, or

communication distortion

in a loud environment.

Popping sound audible

with headset turned on

in a loud environment.

Low rumbling sound with

the headset turned on in

a quiet environment.

Squealing, whistling, or

chirping sound when the

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 Comfort

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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Bose Aviation Headset Series II Seite 20

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