Problem
Clear communication but no active noise compensation
In case of difficulty
If problems occur that are not listed in the below table, please contact your Sennheiser agent.
Possible cause and what to do
The NoiseGard™ electronics are turned off.
Check to see if the ON/OFF switch is set to ON.
The
Check to see if the
If aircraft powered: The aircraft fuse is defective.
Check the aircraft fuse.
If battery powered (except HMEC 302, HMEC 305 and HMEC 306): The batteries are low.
Check to see if the green LED on the battery pack is lit. If the red LED is lit, replace the batteries.
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