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Some field issues may be related to confusion regarding the different configurations and modes
of operation of the headset. Refer to the product description section of this manual for more
information regarding this before troubleshooting.
Note: No internal parts of the headset or control module are serviceable in the field.
The headset is field repairable at a higher level, i.e. control module, earcups, cables, etc. The
list of user replaceable parts is located on page 11 of this manual. Problems associated with the
headset (driver faults, earcup PCB faults, etc.) require the product to be returned to Bose
Corporation for repair.
The troubleshooting steps below describe problems that can be resolved in the field. Refer to
the list of Listening Test Defects in the Test Procedures section for additional information and
specific failure descriptions.
Symptom
No Audio
No Audio from one
Earcup
Intermittent Operation
and/or One or Both
Ears Intermittent.
One ear completely
inoperative: (No ANR
and no audio whether
switched on or off).
Troubleshooting
Is ANR present? Are you connected to the vehicle? Power is
provided by the vehicle when connected to it. Connect known good
headset to same connection on the vehicle. Do you have audio now?
If so problem is with headset. Check all cables, earcups and control
module for damage. If still no audio replace earcup assembly. If not,
problem is with the connection or equipment in the vehicle.
Check sidetone. If you cannot hear your own voice, have someone
using another headset on the same intercom circuit speak. If you can
hear them, you may have a bad microphone. If still no audio, problem
could be in the cable, control module or earcups. Replace the cable.
Okay? If not, replace control module. Okay? If not, then replace
earcups.
Check Talk-Through (TT) switch setting – The TT circuits are
designed to deliver audio at a level up to 85 dB SPL at your ear. An
externally overloaded TT circuit will cause interrupted audio in the
earcups, preventing sound pressure levels of >85 dB SPL from
getting to the ear. This occurs if the TT gain setting is too high at the
rotary switch on the control module and you communicate too loudly,
overwhelming the signal and causing audio dropouts.
Check batteries - There is no LED on the product to allow monitoring
of the battery power level. Low battery when in ANR or TT mode will
cause intermittent operation or clicking every few seconds to indicate
weak batteries. Unit will continue to operate in this mode for some
time before the batteries fail entirely and the unit operation reverts to
fail-safe operation mode. ANR will be intermittent with clicking every
few seconds.
Check that all cables for damage and are fully seated. Replace cable
as needed.
Connect a known good control module and cable. Connect to a
known good source and retest. If still intermittent, replace earcups. If
audio is good with known good control module, replace original
control module.
Check all cables for damage.
Connect a known good control module and cable. Connect to a
known good source and retest. If still inoperative, replace earcup
assembly.
Verification/Solution
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