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Shes overheating and thus goes into emergency mode and shuts down the volume to help cool down the built in amp . Dont know if it has a built in fan (likely not) but its overheating which can be a number of reasons why...from a failed heatsink componet, inadequet venting, shorted circuit. Can you take it out and inspect it?
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 ;)
Good news - they're adjustable. The radio is used to adjust the vehicle's chime level. To change the volume level of the chime, press and hold push-button 6 with the ignition on and the radio power off. The volume level will change from the normal level to loud, and LOUD will appear on the radio display. To change back to the default or normal setting, press and hold push-button 6 again. The volume level will change from the loud level to normal, and NORMAL will appear on the radio display.
Note: Each time the chime volume is changed, three chimes will sound to indicate the new volume selected.
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 ;)
There are 2 types of volume in your nokia phone that you can increase or decrease.
The first one is the ring tone volume. You can either increase or decrease your ring tone volume by pressing the menu key then go to settings, go to profile, select any desired profile go to personalise go to ringing volume, then increase or decrease by using the navigation button to the right or left.
The second way is to increase or decrease the volume of the speaker of your phone which i think is the cause of your question (this volume enables you to hear clear and loud the person on the other phone). You increase or decrease the volume by making a call, as soon as the call starts ringing, press the navigation key to right to increase the volume or to the left to decrease the volume.