Bose Aviation Headset Series II Owner's guide - Page 20
In Case of Difficulty
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In Case of Difficulty Problem What to do Communication but no active noise reduction in both ears. Active noise reduction but no (or very low volume) communication in both ears. • 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). Reduced active noise reduction, intermittent clicking sounds, or communication distortion in a loud environment. 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. Low rumbling sound with the headset turned on in a quiet environment. • 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. Popping sound audible with headset turned on in a loud environment. • 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. Squealing, whistling, or chirping sound when the system is turned on. Check to see if the ear cavity foam liner is missing or severely damaged. If so, refer to "Care and Maintenance" (page 18). 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 replacement 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). 20