Bose A20 Aviation Panduan Pemilik - Halaman 32

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Halaman Cetak

Troubleshooting

Problem

Squealing or

whistling sound

when the headset

is turned on

Low rumbling

sound with the

headset turned

on in a quiet

environment

Crackling sound

audible with

headset turned on

in a loud environ-

ment, or Acoustic

Noise Cancelling

noise reduction is

intermittent

Warning: If the headset emits any loud noise and related loss of communications

while in the Acoustic Noise Cancelling mode, turn off the power switch.

The headset will continue to provide communications in the passive

noise reducing mode.

32 - English

What to do

• Make sure the headset orientation is correct. Use the Left (L) and

Right (R) markings above the earcups to orient the headset cor-

rectly.

• 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 appear to be worn out.

• Adjust the earcup fit to create a better seal on your head. The

headset's low-force design makes it sensitive to items that

interfere with the seal around your ear. Make sure your ears are

completely inside the ear cushions, and that a hat or eyeglasses

with thick temples do not interfere with the seal.

• If the squealing or whistling sound persists, turn off the power

switch and contact Bose for service as soon as possible.

• Adjust the earcup fit to create a better seal on your head. The

low-force design of the headset makes it sensitive to items that

interfere with the seal around your ear. Make sure 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 that

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 fit into the slot on the earcup with no gaps.

Replace any cushions that appear to be worn out.

• Make sure the headset orientation is correct. Use the Left (L) and

Right (R) markings above the earcups to orient the headset

correctly.

• Adjust the earcup fit. Refer to "Wearing and adjusting the headset"

on page 15.

• If your headset is battery-powered, check to see if the battery is

low (indicated by fast blinking red LED).

• If your headset is aircraft powered, make sure the voltage

powering the headset is no less 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.