Sennheiser HMEC 306, HMEC 300, HMDC 322, HMEC 400, HMEC 322 Problem, Possible cause and what to do

Problem

Active noise compensation but very low volume communication

Possible cause and what to do

The volume control is set too low.

￿Check the volume setting of the headset.

The headphone connection has been pulled out (except HMEC 305, HMEC 305-C and HMEC 306).

￿Check to see if the headphone jack plug is correctly connected.

Active noise compensation but	The microphone connection has been pulled out (except HMEC 305, HMEC 305-C and
reduced intelligibility	HMEC 306).
	￿ Check to see if the microphone jack plug is correctly connected.

Communications in one ear only (only HMEC 300, HMEC 302, HMEC 306 and HMEC 306)

You are using a stereo intercom system but the headset is set to mono operation.

￿Set the Mono/Stereo switch to ‘Stereo’.

You are receiving a mono source but the headset is set to stereo operation.

￿Set the Mono/Stereo switch to ‘Mono’.

Microphone output voltage set	Re-adjust the output voltage on the microphone.
too high or too low	￿ To do so, use a small slotted screwdriver and turn the “Mic Gain Adjustment” screw
	(see illustration on page 133) until you reach the desired setting.

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