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The ear cushions are attached to the earcup with plastic tabs that snap into the plastic in the earcup. The lower snaps may be unfastened. Try pressing the ear cushion firmly to the earcup around the lower edge to refasten the snaps. Do not press in the middle of the ear cushion - you may damage the internal microphone.
If this fails, you will need to remove the ear cushion by pulling it off the earcup and inspect for broken plastic where the tabs are on the ear cushion or where the tabs attach to the earcup. If a tab is broken on the earcup, replacement earcups are available from Bose for $35 per pair.
Don't know why answers for different type of headsets shown up on a question about the Telex 850. Probably there is an issue with the cord. The cord has two shielded "double" wires on each pair. The ones for the mic are "white" and "light blue". May be one is cut preventing the mic to work. Look around for a local avionics shop, they should be able to fix it. Hope this helps ;)
Old question, but may be somebody else is experiencing the same issue. The earcup without the boom has a noise cancelling board, so it could be one of the wires that goes from one board to the other one. Gently take the earcup off and look at the 4 wires that are soldered on top (red, black, shield and white). If one of these is cut, the speaker/anr won't work. You will need a very small soldering iron to repair it (no more than 15 - 20 watts). Good luck, hope this helps ;)
The design of these headphones includes a microphone on the outside and
on the inside of each earcup. The outside microphone detects outside
noise. The inside microphone monitors what you are hearing and when it
detects that the outside noise is present inside, the active
noise-canceling circuits remove that noise. This happens fast enough
that you perceive a siginficant reduction in the outside noise getting
to your ears.
The airspace inside the earcup is a tuned chamber defined by the foam in
the ear cushion. This is important because with the inside microphone
in close proximity, but at a 90-degree angle to the speaker, the circuit
must be designed to eliminate the normal feedback that occurs. When you
press the earcup close to your ear, you are changing the size and shape
of the air chamber inside of the earcup thus directing more of the
speaker sound toward the microphone than the design can compensate for
causing audio feedback to occur. You are hearing that feedback.
Removing your hand from the earcup should restore the shape of the air
chamber allowing the circuits to return to normal operation.
If the feedback occurs too easily when you are NOT pressing on the
earcup, then the foam may have weakened/deteriorated and it may be time
to replace the ear cushion.
On my QC-3 headphones, I can cause the feedback squeal in both earcups,
with the left earcup being more sensitive to the shape change than the