Bose QuietComfort User Manual - Page 8

Reference Cleaning the headphones Scheduled cleaning is not required. However, you can simply wipe the outside surfaces with a damp cloth, as needed. Also, be sure that the earcup ports are clear and that no moisture is allowed into the earcups. Troubleshooting Problem • Noise reduction absent • Low or no volume Possible Cause No power to headphone Audio source setting Audio attenuator connection Solution Turn unit on; check battery Turn source volume up or set audio attenuator on "Hi" Check connection at source and insertion into the earcup • Crackling noise; Low battery intermittent loss of noise reduction • Low rumbling Poor earcup fit Ports blocked Replace battery Adjust fit on ears Clear ports AM257565_00 _V.pdf May 13, 2003 8